SINUMERIK 840D sl. Service - Functions. Manual (2018-2020)

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10.2 Cam signals and cam positions

Linear axes

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Position switching signals for linear axis (minus cam < plus cam)

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Position switching signals for linear axis (plus cam < minus cam)

Extended Functions

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10.2 Cam signals and cam positions

Modulo rotary axis

The default signal response for modulo rotary axes is dependent on the cam width:

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Software cams for modulo rotary axis (plus cam - minus cam < 180 degrees)

Extended Functions

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10.2 Cam signals and cam positions

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Software cams for modulo rotary axis (plus cam - minus cam > 180 degrees)

Suppression of signal inversion

With the following setting, selection of signal inversion for

"plus cam - minus cam > 180 degrees" can be suppressed.

MD10485 SW_CAM_MODE bit 1=1

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10.2 Cam signals and cam positions

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Software cams for modulo rotary axis (plus cam - minus cam > 180 degrees) and suppression of signal inversion

10.2.3

Cam positions

Setting cam positions

The positions of the plus and minus cams are defined using general setting data:

● SD41500 SW_CAM_MINUS_POS_TAB_1[n]

Position of minus cams 1 - 8

● SD41501 SW_CAM_PLUS_POS_TAB_1[n]

Position of plus cams 1 - 8

● SD41502 SW_CAM_MINUS_POS_TAB_2[n]

Position of minus cams 9 - 16

● SD41503 SW_CAM_PLUS_POS_TAB_2[n]

Position of plus cams 9 - 16

● SD41504 SW_CAM_MINUS_POS_TAB_3[n]

Position of minus cams 17 - 24

● SD41505 SW_CAM_PLUS_POS_TAB_3[n]

Position of plus cams 17 - 24

● SD41506 SW_CAM_MINUS_POS_TAB_4[n]

Position of minus cams 25 - 32

● SD41507 SW_CAM_PLUS_POS_TAB_4[n]

Position of plus cams 25 - 32

Note

Owing to the grouping of cam pairs (eight in each group), it is possible to assign different

access authorization levels (e.g. for machine-related and workpiece-related cam positions).

The positions are entered in the machine coordinate system. No check is made with respect

to the maximum traversing range.

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10.2 Cam signals and cam positions

Dimension system metric/inch

With the setting:

MD10260 CONVERT_SCALING_SYSTEM = 1

, the cam positions no longer refer to the configured basic dimension system, but to the

dimension system set in the following machine data:

MD10270 POS_TAB_SCALING_SYSTEM (measuring system of position tables)

Value

Meaning

Metric

inch

MD10270 therefore defines the dimension system for position data from setting data SD41500

… SD41507.

A switchover with G70/G71 or G700/G710 has no effect.

Sensing of cam positions

To set the cam signals, the actual position of the axes is compared to the cam position.

Writing/reading of cam positions

The setting data can be read and written via HMI, PLC and part program.

Accesses from the part program are not synchronous to machining.

Synchronization can only be achieved by means of a programmed block preprocessing stop

(STOPRE command).

It is possible to read and write the cam positions with FB2 and FB3 in the PLC user program.

Axis/cam assignment

A cam pair is assigned to a machine axis using the general machine data:

MD10450 SW_CAM_ASSIGN_TAB[n] (assignment of software cams to machine axes)

Note

Changes to an axis assignment take effect after the next NC power-up.

Cam pairs to which no axis is assigned are not active.

A cam pair can only be assigned to one machine axis at a time.

Several cam pairs can be defined for one machine axis.

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10.2 Cam signals and cam positions

10.2.4

Lead/delay times (dynamic cam)

Function

To compensate for any delays, it is possible to assign two lead or delay times with additive

action to each minus and plus cam for the cam signal output.

The two lead or delay times are entered in a machine data and a setting data.

Note

The input of negative time values causes a delay in the output of cam signals.

Lead or delay time in machine data

The first lead or delay time is entered in the following general machine data:

● MD10460 SW_CAM_MINUS_LEAD_TIME[n]

(lead or delay time at the minus

cams)

● MD10461 SW_CAM_PLUS_LEAD_TIME[n]

(lead or delay time at the plus

cams)

For example, the following can be entered into the machine data:

● Constant internal delay times between actual value sensing and cam signal output (e.g. as

determined by an oscilloscope)

● Constant external delay times

Lead or delay time in setting data

The second lead or delay time is entered into the following general setting data:

● SD41520 SW_CAM_MINUS_TIME_TAB_1[n]

(lead or delay time at the minus

cams 1 - 8)

● SD41521 SW_CAM_PLUS_TIME_TAB_1[n]

(lead or delay time at the plus cams

1 - 8)

● SD41522 SW_CAM_MINUS_TIME_TAB_2[n]

(lead or delay time at the minus

cams 9 - 16)

● SD41523 SW_CAM_PLUS_TIME_TAB_2[n]

(lead or delay time at the plus cams

9 - 16)

● SD41524 SW_CAM_MINUS_TIME_TAB_3[n]

(lead or delay time at the minus

cams 17 - 24)

● SD41525 SW_CAM_PLUS_TIME_TAB_3[n]

Lead or delay time on plus cams

17 - 24

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10.3 Output of cam signals

● SD41526 SW_CAM_MINUS_TIME_TAB_4[n]

(lead or delay time at the minus

cams 25 - 32)

● SD41527 SW_CAM_PLUS_TIME_TAB_4[n]

(lead or delay time at the plus cams

25 - 32)

Delay times which may change during machining must, for example, be entered in the setting

data.

10.3

Output of cam signals

10.3.1

Activating

The status of the cam (cam signals) can be output to the PLC as well as to the NC I/O.

Activation of cam signal output

The output of cam signals of an axis is activated via the NC/PLC interface signal:

DB31, ... DBX2.0 (cam activation)

Check-back signal to PLC

The successful activation of all cams of an axis is signaled back to the PLC using the following

NC/PLC interface signal:

DB31, ... DBX62.0 (cams active)

Note

The activation can be linked with other conditions by the PLC user (e.g. axis referenced, reset

active).

10.3.2

Output of cam signals to PLC

Output to PLC

The status of the cam signals for all machine axes with activated software cams is output to

the PLC.

The status is output in the IPO cycle and is transferred to the PLC asynchronously.

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10.3 Output of cam signals

Minus cam signals

The status of the minus cam signals is entered into the following NC/PLC interface signals:

DB10 DBX110.0 to 113.7 (minus cam signal 1 to 32)

Plus cam signals

The status of the plus cam signals is entered into the following NC/PLC interface signals:

DB10 DBX114.0 to 117.7 (plus cam signals 1 to 32)

Note

If no measuring system has been selected or NC/PLC interface signal DB31, ... DBX2.0 (cam

activation) is set to 0, then the following NC/PLC interface signals are also set to 0:

● DB10 DBX110.0-113.7 (minus cam signals 1-32)

● DB10 DBX114.0-117.7 (plus cam signals 1-32)

● DB31, ... DBX62.0 (cams active)

10.3.3

Output of cam signals to NCK I/Os in position control cycle

Signal output in position control cycle

For cams assigned to an HW byte via machine data MD10470 to MD10473 (see Section

"Hardware assignment"), the signal is output in the position control cycle.

The four onboard outputs on the NCU and a total of 32 optional external NC outputs are

available as the digital outputs of the NC I/O (see Section "A4: Digital and analog NC I/O for

SINUMERIK 840D sl (Page 31)").

Hardware assignment

The assignment to the hardware bytes used is made for each eight cam pairs in the following

general machine data:

● MD10470 SW_CAM_ASSIGN_FASTOUT_1

Hardware assignment for the output of

cams1 - 8 to NC I/O

● MD10471 SW_CAM_ASSIGN_FASTOUT_2

Hardware assignment for the output of

cams 9 - 16 to NC I/O

● MD10472 SW_CAM_ASSIGN_FASTOUT_3

Hardware assignment for the output of

cams 17 - 24 to NC I/O

● MD10473 SW_CAM_ASSIGN_FASTOUT_4

Hardware assignment for the output of

cams 25 - 32 to NC I/O

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10.3 Output of cam signals

Note

It is possible to define one HW byte for the output of eight minus cam signals and one HW

byte for the output of eight plus cam signals in each machine data.

In addition, the output of the cam signals can be inverted with the two machine data.

If the 2nd byte is not specified (= "0"), then the 8 cams are output as a logic operation of the

minus and plus cam signals via the 1st inversion mask using the 1st hardware byte.

Status query in the part program

The status of the HW outputs can be read in the part program with main run variable

$A_OUT[n] (n = no. of output bit).

Switching accuracy

Signals are output to the NC I/O or onboard outputs in the position control cycle.

As a result of the time scale of the position control cycle, the switching accuracy of the cam

signals is limited as a function of the velocity.

The following applies:

Delta pos = V_act * position control cycle

with: Delta pos =

switching accuracy (depending on position control cycle)

V_act =

Current axis velocity

Example:

V_act = 20 m/min, PC cycle = 4 ms

Delta pos = 1.33 mm

V_act = 2000 rpm, PC cycle = 2 ms

Delta pos = 24 degrees

10.3.4

Timer-controlled cam signal output

Timer-controlled output

A significantly higher degree of accuracy can be achieved by outputting the cam signals

independently of the position control cycle using a timer interrupt.

The following machine data can be used to select the timer-controlled output to the 4 NCU

onboard outputs for 4 cam pairs:

MD10480 SW_CAM_TIMER_FASTOUT_MASK (screen form for the output of cam signals via

timer interrupts on the NCU)

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10.3 Output of cam signals

In this case, the minus and plus signals of a cam pair are logically combined for output as one

signal.

Signal generation

Previously, it had to be specified in which way the signals to be logically combined should be

generated. This is realized using bit 1 in machine data:

MD10485 SW_CAM_MODE (behavior of the software cams)

Bit

Value

Signal generation

Inversion of the signal behavior of the plus cam when:

plus cam - minus cam ≥ 180 degrees

No inversion of the signal behavior of the plus cam when:

plus cam - minus cam ≥ 180 degrees

Note

This function operates independently of the HW assignment selected in MD10470 ... MD10473.

The onboard byte may not be used a multiple number of times.

Restrictions

The following applies to the mutual position of the cam positions:

Only one timer-controlled output takes place per interpolation cycle.

If signal changes for more than one cam pair are active in the same interpolation cycle, the

output is prioritized:

The cam pair with the lowest number (1...32) determines the output time for all active signals,

i.e. the signal change of the other cam pairs takes place at the same time.

PLC interface

The NC image of the onboard outputs and the status of the plus and minus cams is displayed

at the PLC interface.

However, these signals are irrelevant or correspondingly inaccurate for the timer-controlled

cam output version, as described in the following paragraphs. The signals for the plus and

minus cams are generated (once) in synchronism with the interpolator clock cycle and

transmitted together to the PLC.

Pulses shorter than an interpolator clock cycle are therefore not visible in the PLC.

The onboard outputs are set and reset asynchronously to the interpolator clock cycle for each

interrupt. The status of the onboard outputs is detected and transmitted to the PLC in

synchronism with the update time of the PLC interface.

Depending on the current status at the moment the PLC interface is updated, pulses shorter

than one interpolator clock cycle are not visible or are displayed stretched by one or several

IPO cycles.

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10.3 Output of cam signals

Further settings

The following bit must be set to "0" if the behavior described here is to be activated:

MD10485 SW_CAM_MODE bit 0 = 0

10.3.5

Independent, timer-controlled output of cam signals

Independent, timer-controlled cam output

Each switching edge is output separately per interrupt due to the timer-controlled, independent

(of interpolator clock cycle) cam output.

The mutual influence of the cam signals is no longer applicable as a result of:

● single output per interpolator clock cycle

● output time determined by highest priority cam pair (lowest cam pair number)

A total of 8 timer-controlled cam outputs per interpolator clock cycle can be configured for

setting/resetting the 4 onboard outputs. The signal states of the plus and minus cams are also

made available as standard on the PLC interface for the timer-controlled variant. However,

these signals are not relevant or are correspondingly inaccurate with a timer-controlled output.

Signal generation

Previously, it had to be specified in which way the signals to be logically combined should be

generated. This is realized using bit 1 in machine data:

MD10485 SW_CAM_MODE (behavior of the software cams)

Bit

Value

Signal generation

Inversion of the signal behavior of the plus cam when:

plus cam - minus cam ≥ 180 degrees

No inversion of the signal behavior of the plus cam when:

plus cam - minus cam ≥ 180 degrees

Settings

Cam pairs are assigned to onboard outputs using machine data:

MD10480 SW_CAM_TIMER_FASTOUT_MASK (screen form for the output of cam signals via

timer interrupts on the NCU)

In addition, this type of processing must be explicitly selected:

MD10485 SW_CAM_MODE bit 0 = 1

Note

This function operates independently of the HW assignment selected in MD10470 … MD10473.

The onboard byte may not be used a multiple number of times.

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10.4 Position-time cams

10.4

Position-time cams

The term "position-time cam" refers to a pair of software cams that can supply a pulse of a

certain duration at a defined axis position.

Solution

The position is defined by a pair of software cams.

The pulse duration is defined by the lead/delay time of the plus cam.

Machine data can be used to specify that cam pairs with "minus cam position = plus cam

position" should be processed as position-time cams.

Properties of position-time cams

● The pulse duration is independent of the axis velocity and travel direction reversal.

● The pulse duration is independent of changes in the axis position (Preset).

● Activation (rising signal edge) takes place only when the cam position is crossed.

Moving the axis position (e.g. preset) does not trigger activation.

● A lead/delay time is operative for the minus cam and causes a time displacement of the

pulse.

● Activation (ON edge) and pulse duration are independent of the travel direction.

● The cam is not deactivated if the cam position is crossed again when the cam is active

(direction reversal).

● The cam time (pulse width) is not interrupted and the cam time not restarted when the cam

position is crossed again.

This behavior is particularly relevant with respect to modulo axes, i.e. if the cam time is

greater than the modulo range crossing time, the cam is not switched in every revolution.

Settings

The following settings must be made to program a position-time cam:

● Position

The position must be defined by a cam pair with which the minus cam position is equal to

the plus cam position.

This is defined using setting data:

SD41500 SW_CAM_MINUS_POS_TAB_1

SD41507 SW_CAM_PLUS_POS_TAB_4.

● Pulse duration

The pulse duration is calculated by adding together the associated entries for the cam pair

in:

MD10461 SW_CAM_PLUS_LEAD_TIME[n]

SD41521 SW_CAM_PLUS_TIME_TAB_1[n]...

SD41527 SW_CAM_PLUS_TIME_TAB_4[n]

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10.6 Data lists

● Offset

The time displacement of the position-time cam is calculated by adding together the

associated entries for the cam pair in:

MD10460 SW_CAM_MINUS_LEAD_TIME[n]

SD41520 SW_CAM_MINUS_TIME_TAB_1[n]...

SD41526 SW_CAM_MINUS_TIME_TAB_4[n]

● Mode

MD10485 SW_CAM_MODE

Bit 2 = 1 must be set in the machine data to ensure that all cam pairs with the same values

for minus cam and plus cam positions are treated as position-time cams.

10.5

Supplementary Conditions

Availability of function "Software cams, position switching signals"

The function is an option ("position-switching signals/cam controller"), which must be assigned

to the hardware through the license management.

10.6

Data lists

10.6.1

Machine data

10.6.1.1

General machine data

Number

Identifier: $MN_

Description

10260

CONVERT_SCALING_SYSTEM

Basic system switchover active

10270

POS_TAB_SCALING_SYSTEM

System of units for positioning tables

10450

SW_CAM_ASSIGN_TAB[n]

Assignment of software cams to machine axes

10460

SW_CAM_MINUS_LEAD_TIME[n]

Lead or delay time at the minus cams 1-16

10461

SW_CAM_PLUS_LEAD_TIME[n]

Lead or delay time at the plus cams 1-16

10470

SW_CAM_ASSIGN_FASTOUT_1

Hardware assignment for the output of cams

1-8 to NC I/O

10471

SW_CAM_ASSIGN_FASTOUT_2

Hardware assignment for the output of cams

9-16 to NC I/O

10472

SW_CAM_ASSIGN_FASTOUT_3

Hardware assignment for the output of cams

17-24 to NC I/O

10473

SW_CAM_ASSIGN_FASTOUT_4

Hardware assignment for the output of cams

25-32 to NC I/O

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10.6 Data lists

Number

Identifier: $MN_

Description

10480

SW_CAM_TIMER_FASTOUT_MASK

Screen form for the output of the cam signals via timer

interrupts on the NCU

10485

SW_CAM_MODE

Behavior of the software cams

10.6.2

Setting data

10.6.2.1

General setting data

Number

Identifier: $SN_

Description

41500

SW_CAM_MINUS_POS_TAB_1[n]

Position of minus cams 1 -8

41501

SW_CAM_PLUS_POS_TAB_1[n]

Position of plus cams 1 -8

41502

SW_CAM_MINUS_POS_TAB_2[n]

Position of minus cams 9 -16

41503

SW_CAM_PLUS_POS_TAB_2[n]

Position of plus cams 9 -16

41504

SW_CAM_MINUS_POS_TAB_3[n]

Position of minus cams 17 -24

41505

SW_CAM_PLUS_POS_TAB_3[n]

Position of plus cams 17 -24

41506

SW_CAM_MINUS_POS_TAB_4[n]

Position of minus cams 25 -32

41507

SW_CAM_PLUS_POS_TAB_4[n]

Position of plus cams 25 -32

41520

SW_CAM_MINUS_TIME_TAB_1[n]

Lead or delay time on minus cams 1 -8

41521

SW_CAM_PLUS_TIME_TAB_1[n]

Lead or delay time on plus cams 1 -8

41522

SW_CAM_MINUS_TIME_TAB_2[n]

Lead or delay time on minus cams 9 -16

41523

SW_CAM_PLUS_TIME_TAB_2[n]

Lead or delay time on plus cams 9 -16

41524

SW_CAM_MINUS_TIME_TAB_3[n]

Lead or delay time on minus cams 17 -24

41525

SW_CAM_PLUS_TIME_TAB_3[n]

Lead or delay time on plus cams 17 -24

41526

SW_CAM_MINUS_TIME_TAB_4[n]

Lead or delay time on minus cams 25 -32

41527

SW_CAM_PLUS_TIME_TAB_4[n]

Lead or delay time on plus cams 25 -32

10.6.3

Signals

10.6.3.1

Signals to axis/spindle

Signal name

SINUMERIK 840D sl

SINUMERIK 828D

Cam activation

DB31,

DBX2.0

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11.1

Brief Description

Subfunctions

The functions specific to punching and nibbling operations comprise the following:

● Stroke control

● Automatic path segmentation

● Rotatable punch and die

● Clamp protection

They are activated and deactivated via language commands.

11.2

Stroke control

11.2.1

General information

Functionality

The stroke control is used in the actual machining of the workpiece. The punch is activated

via an NC output signal when the position is reached. The punching unit acknowledges its

punching motion with an input signal to the NC. No axis may move within this time period.

Repositioning takes place after the punching operation.

High-speed signals

"High-speed signals" are used for direct communication between the NC and punching unit.

Combined with the punch, they allow a large number of holes to be punched per minute since

the punch positioning times are interpreted as machining delays.

PLC signals

PLC interface signals are used for non-time-critical functions such as enabling and monitoring.

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11.2 Stroke control

11.2.2

High-speed signals

Functionality

High-speed signals are used to synchronize the NC and punching unit. On the one hand, they

are applied via a high-speed output to ensure that the punch stroke is not initiated until the

metal sheet is stationary. On the other, they are applied via a high-speed input to ensure that

the sheet remains stationary while the punch is active.

The high-speed digital inputs and outputs on the control are used to drive the punching unit.

The following signal chart illustrates the signal sequence.

(a)

Axis motion of the machine as function v(t)

(b)

"Stroke initiation" signal

(c)

"Stroke active" signal

Figure 11-1

Signal chart

Note

The "Stroke active" signal is high-active for reasons relating to open-circuit monitoring.

The chronological sequence of events for punching and nibbling is controlled by the two signals

A₀ and E₀:

A₀

Set by the NC and identical to stroke initiation.

E₀

Defines the status of the punching unit and identical to the "Stroke active" signal.

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11.2 Stroke control

The signal states characterize and define times t

to t₄ in the following way:

t₁

The motion of the workpiece (metal sheet) in relation to the punch is completed at instant t₁.

Depending on the criterion defined for stroke initiation (see Section "Criteria for stroke initiation

(Page 643)"), the high-speed output O₀ is set for punch initiation ①.

t₂

The punching unit signals a punch movement via high-speed input E₀ at instant t₂.

This is triggered by signal A₀②.

For safety reasons, signal E₀ is high-active (in the case of an open circuit, "Stroke active" is

always set and the axes do not move).

The "Stroke active" signal is not reset again until the tool has moved away from the metal sheet

(t₄).

t₃

The NC reacts to the "Stroke active" signal at instant t₃ by canceling the "Stroke initiation" signal

③. From this point in time onwards, the NC is in a waiting state. It simply waits for cancellation

of the "Stroke active" signal so it can initiate the next axis motion.

The next stroke can be initiated only after signal A₀ has disappeared.

t₄

The punching operation is complete at instant t₄, i.e. the punch has exited from the metal sheet

again.

The NC reacts to a signal transition in signal E₀ by starting an axis motion ④.

The reaction of the NC to a signal edge change ④ is described in the section headed "Axis start

after punching".

Note

The stroke time is determined by the period Δt_h = t₄ - t₁.

Reaction times at instant t₄ between the signal transition of E₀ and the start of the axis motion

must also be added.

11.2.3

Criteria for stroke initiation

Initiate a stroke

The stroke initiation must be set, at the earliest, for the point in time at which it can be

guaranteed that the axes have reached a standstill. This ensures that at the instant of punching,

there is absolutely no relative movement between the punch and the metal sheet in the

machining plane.

The following diagram shows the various criteria that can be applied to stroke initiation.

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11.2 Stroke control

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Figure 11-2

Signal chart: Criteria for stroke initiation

The time interval between t₁ and t₂ is determined by the reaction of the punching unit to setting

of output A₀. This cannot be altered, but can be utilized as a lead time for minimizing dead

times.

The diagram above shows the default setting with which the output is set when the "Exact stop

fine window" is reached (G601; default setting of G group 12). The punch initiation times t''₁

and t'₁ are programmed by means of G602 and G603 (see table below).

Programming

Activation

Description

G603

Stop interpolation

The interpolation reaches the block end. In this case,

the axes continue to move until the overtravel has been

traversed, i.e. the signal is output at an appreciable in-

terval before the axes have reached zero speed (see

t"₁).

G602

Reach the coarse in-po-

The signal is output once the axes have reached the

sition window

coarse in-position window. If this criterion is selected for

stroke initiation output, then the instant of stroke initia-

tion can be varied through the size of interpolation win-

dow (see t'₁).

G601

Reach the fine in-posi-

In this case, it can always be ensured that the machine

tion window

will have reached a standstill at the instant of punching

provided that the axis data are set appropriately.

However, this variant also results in a maximum dead

time (see t₁).

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11.2 Stroke control

Note

The initial setting of the G group with G601, G602 and G603 (G group 12) is defined via machine

data:

MD20150 $MC_GCODE_RESET_VALUES[11]

The default setting is G601.

G603

Depending on velocity and machine dynamics, approximately 3 - 5 interpolation cycles are

processed at the end of interpolation before the axes reach zero speed.

MD26018 $MC_NIBBLE_PRE_START_TIME

In conjunction with the above machine data, it is possible to delay, and therefore optimize, the

instant between reaching the end of interpolation and setting the high-speed output for "Stroke

ON".

The following setting data is available in addition to MD26018:

SD42402 $SC_NIBPUNCH_PRE_START_TIME

SD42402 can be changed from the part program and therefore adapted to the punching

process depending on the progress of the part program run.

The following applies to the delay time:

MD26018 = 0

→ SD42402 is operative

MD26018 ≠ 0

→ MD26018 is operative

If the "Punching with dwell time, PDELAYON" is active, then the dwell time programmed in

connection with this function is active. Neither MD26018 nor SD42402 is operative in this case.

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11.2 Stroke control

11.2.4

Axis start after punching

Input signal "Stroke ON"

The start of an axis motion after stroke initiation is controlled via input signal "Stroke ON".

Figure 11-3

Signal chart: Axis start after punching

In this case, the time interval between t₄ and t'₄ acts as a switching-time-dependent reaction

time. It is determined by the interpolation sampling time and the programmed punching/nibbling

mode.

PON/SON

When the punching unit is controlled via PON/SON, the maximum delay time is calculated to be:

|t'₄ - t₄| = 3 x interpolator clock cycle

PONS/SONS

If the punch is controlled by PONS/SONS, the delay time is determined by:

|t'₄ - t₄| ≤ 3 x position controller cycles

Prerequisites: Stroke time (t₄ - t₂) > 4 interpolator clock cycles

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11.2 Stroke control

11.2.5

PLC signals specific to punching and nibbling

Function

In addition to the signals used for direct stroke control, channel-specific PLC interface signals

are also available. These are used both to control the punching process and to display

operational states.

Signals

Signal

Activation

DB21, ... DBX3.0 (no stroke enable)

Prevents the NC from initiating a punching operation.

The NC waits until the enable signal is available before

continuing the part program.

DB21, ... DBX3.2 (stroke suppression)

Allows the part program to be processed without initiat-

ing a punching operation (dry run).

With active path segmentation, the axes traverse in

"Stop and go" mode.

DB21, ... DBX3.4 (delayed stroke)

Activates delayed stroke output if permitted by

PDELAYON.

DB21, ... DBX3.1 (manual stroke suppres-

Enables the operator to initiate a punching operation

sion)

(controlled via the PLC) without executing the part pro-

gram.

Manual stroke initiation is acknowledged with signal:

DB21, .. DBX38.1 (acknowledgement of manual stroke

initiation)

11.2.6

Punching and nibbling-specific reactions to standard PLC signals

DB21, ... DBX12.3 (feed stop)

With interface signal:

DB21, ... DBX12.3 (feed stop)

, the NC reacts in the following way with respect to the stroke control:

Signal is detected in advance of instant t₁:

Stroke initiation is suppressed.

The next stroke is not initiated until the next start or until

the "Feed stop" signal has been canceled.

Machining is then continued as if there had been no inter-

ruption.

Signal is detected at instant t₁:

The current stroke is executed to completion.

The NC then dwells in the state characterized by t₄.

To allow it to respond in this manner, time monitoring of the

"Stroke active" and "Stroke initiation" signals is dispensed

with.

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11.3 Activation and deactivation

11.2.7

Signal monitoring

Oscillating signal

Owing to aging of the punch hydraulics, punch overshoot may cause the "Stroke active" signal

to oscillate at the end of a stroke.

In this case, an alarm can be generated (Alarm 22054 "undefined punching signal") as a

function of machine data:

MD26020 $MC_NIBBLE_SIGNAL_CHECK

Reset behavior

In the case of an NC reset, the interface signal:

DB21, ... DBX38.0 (stroke initiation active)

is canceled immediately without acknowledgement via the high-speed input.

A currently activated stroke cannot be suppressed.

11.3

Activation and deactivation

11.3.1

Language commands

Punching and nibbling functions are activated and deactivated via configurable language

commands. These replace the special M functions that were used in earlier systems.

References:

Programming Manual, Job Planning

Groups

The language commands are subdivided into the following groups:

Group 35

The actual punching and nibbling-specific functions are activated and deactivated by means of the

following language commands:

PON

= punching ON

SON

= nibbling ON

PONS

= punching ON, activated in the position controller

SONS

= nibbling ON, activated in the position controller

SPOF

= punching/nibbling OFF

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11.3 Activation and deactivation

Group 36

This group includes the commands which have only a preparatory character and which determine the

real nature of the punching function:

PDELAYON

= punching with delay ON

PDELAYOF

= punching with delay OFF

Since the PLC normally needs to perform some preliminary tasks with respect to these preparatory

functions, they are programmed before the activating commands.

Group 38

This group contains the commands for switching over to a second punch interface. It can be used, for

example, for a second punching unit or set of hammer shears. A second I/O pair which can be used

for punching functionality is defined via machine data.

SPIF1

= first interface is active

SPIF2

= second interface is active

Note

Only one function at a time can be active within a G group (similar, for example, to the various

interpolation modes G0, G1, G2, G3, etc. which are also mutually exclusive).

SPOF

Punching and nibbling OFF

The SPOF function terminates all punching and nibbling functions. In this state, the NC

responds neither to the "Stroke active" signal nor to the PLC signals specific to punching and

nibbling functions.

If SPOF is programmed together with a travel command in one block (and in all further blocks

if punching/nibbling is not activated with SON or PON), the machine approaches the

programmed position without the initiation of a punching operation. SPOF deselects SON, SONS,

PON and PONS and corresponds to the Reset condition.

Programming example:

Program code

Comment

N20 G90 X100 SON

; Activate nibbling

N25 X50 SPOF

; Deactivate nibbling,

; Positioning without stroke initiation

SON

Nibbling ON

SON activates the nibbling function and deselects the other functions in G group35 (e.g. PON).

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11.3 Activation and deactivation

In contrast to punching, the first stroke is made at the start point of the block with the activating

command, i.e. before the first machine motion.

SON has a modal action, i.e. it remains active until either SPOF or PON is programmed or until

the program end is reached.

The stroke initiation is suppressed in blocks without traversing information relating to the axes

designated as punching or nibbling axes (typically those in the active plane). If a stroke still

needs to be initiated, then one of the punching/nibbling axes must be programmed with a 0

traversing path. If the first block with SON is a block without traversing information of the type

mentioned, then only one stroke takes place in this block since the start and end points are

identical.

Programming example:

Program code

Comment

N70 X50 SPOF

; Positioning without punch initiation

N80 X100 SON

; Activate nibbling, initiate a stroke before the

; Motion (X=50) and at the end of the programmed

; motion (X=100)

SONS

Nibbling ON (in position control cycle)

SONS behaves in the same way as SON. The function is activated in the position control cycle,

thus allowing time-optimized stroke initiation and an increase in the punching rate per minute.

PON

Punching ON

PON activates the punching function and deactivates SON.

PON has a modal action like SON.

In contrast to SON, however, a stroke is not executed until the end of the block or, in the case

of automatic path segmentation, at the end of a path segment. PON has an identical action to

SON in the case of blocks which contain no traversing information.

Programming example:

Program code

Comment

N100 Y30 SPOF

; Positioning without punch initiation

N110 Y100 PON

; Activate punching, punch initiation at the end of the

; positioning operation (Y=100)

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11.3 Activation and deactivation

PONS

Punching ON (in position control cycle)

PONS behaves in the same way as PON. For explanation, please refer to SONS.

PDELAYON

Punching with delay ON

PDELAYON is a preparatory function. This means that PDELAYON is generally programmed

before PON. The punch stroke is output with a delay when the programmed end position is

reached.

The delay time in seconds is programmed in setting data:

SD42400 $SC_PUNCH_DWELLTIME

If the defined value cannot be divided as an integer into the interpolator clock cycle, then it is

rounded to the next divisible integer value.

The function has a modal action.

PDELAYOF

Punching with delay OFF

PDELAYOF deactivates punching with delay function, i.e. the punching process continues

normally. PDELAYON and PDELAYOF form a G group.

Programming example:

SPIF2 activates the second punch interface. This means that the stroke is controlled via the

second pair of high-speed I/Os (see Section "Channelspecific machine data (Page 680)",

MD26004 and MD26006).

Program code

Comment

N170 PDELAYON X100 SPOF

; Position without punch initiation, activate delayed

punch initiation

N180 X800 PON

; Activate punching. The punch stroke is output with a

delay when the end position is reached

N190 PDELAYOF X700

; deactivate punching with delay, normal punch initia-

tion on. End of programmed motion

SPIF1

Activation of first punch interface

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11.3 Activation and deactivation

SPIF1 activates the first punching interface. This means that the stroke is controlled via the

first pair of high-speed I/Os (see Section "Channelspecific machine data (Page 680)",

MD26004 and MD26006).

The first punch interface is always active after a reset or control system power up. If only one

interface is used, then it need not be programmed.

SPIF2

Activation of second punch interface

SPIF2 activates the second punch interface. This means that the stroke is controlled via the

second pair of high-speed I/Os (see Section "Channelspecific machine data (Page 680)",

MD26004 and MD26006).

Programming example:

Program code

Comment

N170 SPIF1 X100 PON

; At the end of the block, a stroke is initiated at the

first fast output. The "Stroke active" signal is monitored

at the first input.

N180 X800 SPIF2

; The second stroke is initiated at the second fast output.

The "Stroke active" signal is monitored at the second input.

N190 SPIF1 X700

; All further strokes are controlled with the first inter-

face.

11.3.2

Functional expansions

Alternate interface

Machines that alternately use a second punching unit or a comparable medium can be

switched over to a second I/O pair.

The second I/O pair can be defined via the following machine data:

MD26004 $MC_NIBBLE_PUNCH_OUTMASK

MD26006 $MC_NIBBLE_PUNCH_INMASK

The interface is switched by command SPIF1 or SPIF2.

Full punching/nibbling functionality is available on both interfaces.

Example:

Hardware assignment for stroke control

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11.3 Activation and deactivation

Define the high-speed byte in each case on the CPU as a high-speed punch interface:

MD26000 $MC_PUNCHNIB_ASSIGN_FASTIN = 'H00030001' → Byte 1

MD26002 $MC_PUNCHNIB_ASSIGN_FASTOUT = 'H00000001'

Remark:

The first and second bits are inverted.

Screen form for high-speed input and output bits:

First interface output bit

MD26004 $MC_NIBBLE_PUNCH_OUTMASK[0]

= 1

→ Bit 1 SPIF1

Second interface output bit

MD26004 $MC_NIBBLE_PUNCH_OUTMASK[1]

= 2

→ Bit 2 SPIF2

First interface input bit

MD26006 $MC_NIBBLE_PUNCH_INMASK[0]

= 1

→ Bit 1 SPIF1

Second interface input bit

MD26006 $MC_NIBBLE_PUNCH_INMASK[1]

= 2

→ Bit 2 SPIF2

Automatically activated pre-initiation time

Dead times due to the reaction time of the punching unit can be minimized if the stroke can

be initiated before the interpolation window of the axes is reached. The reference time for this

is the interpolation end. The stroke is automatically initiated with G603 and delayed by the set

value in relation to the time that the end of interpolation is reached.

The delay time for stroke initiation can be adjusted in machine data:

MD26018 $MC_NIBBLE_PRE_START_TIME

Example:

With an IPO cycle of 5 ms, a stroke shall be released two cycles after reaching the interpolation

end:

⇒ MD26018 $MC_NIBBLE_PRE_START_TIME = 0.01 [s]

A pre-initiation time can also be programmed in setting data:

SD42402 $SC_NIBPUNCH_PRE_START_TIME

This setting takes effective only if MD26018 = 0 has been set.

Monitoring of the input signal

If the "stroke active" signal is fluctuating between strokes due to plunger overshoots, for

example, the message "undefined punching signal" can be also be output when interpolation

is stopped.

The message output is dependent on the setting in machine data:

MD26020 $MC_NIBBLE_SIGNAL_CHECK

MD26020 = 0

No alarm

MD26020 = 1

Alarm

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11.3 Activation and deactivation

Minimum period between two strokes

A minimum time interval between two consecutive strokes can be programmed in setting data:

SD42404 $SC_MINTIME_BETWEEN_STROKES

Example:

There must be a minimum delay of at least 1.3 seconds between two stroke initiations

irrespective of physical distance:

⇒ SD42404 $SC_MINTIME_BETWEEN_STROKES = 1.3 [s]

If a punching dwell time (PDELAYON) is also programmed, then the two times are applied

additively.

If a pre-initiation time at G603 is programmed, it will be effective only if the end of interpolation

is reached before the time set in SD 42404:

The programmed time becomes operative immediately. Depending on the size of the block

buffer, strokes that have already been programmed can be executed with this minimum

interval. The following programming measures (example) can be taken to prevent this:

Program code

N...

N100 STOPRE

N110 $SC_ MINTIME_BETWEEN_STROKES = 1.3

The function is not active when SD42404 = 0.

Travel-dependent acceleration

An acceleration characteristic can be defined with PUNCHACC (Smin, Amin, Smax,

Amax). This command can be used to define different acceleration rates depending on the

distance between holes.

Example 1:

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11.3 Activation and deactivation

381&+$&&

6 >PP@

The characteristic defines the following acceleration rates:

Distance be-

Acceleration

tween holes

< 2 mm

The axis accelerates at a rate corresponding to 50 % of maximum acceleration.

2 - 10 mm

Acceleration is increased to 100 %, proportional to the spacing.

> 10 mm

The axis accelerates at the maximum rate (100%).

Example 2:

381&+$&&

6 >PP@

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11.3 Activation and deactivation

The characteristic defines the following acceleration rates:

Distance be-

Acceleration

tween holes

< 3 mm

The axis accelerates at a rate corresponding to 75 % of maximum acceleration.

3 - 8 mm

Acceleration is reduced to 25 %, proportional to the spacing.

> 10 mm

The axis accelerates at the maximum rate (25 %).

If a reduced acceleration rate has already been programmed via ACC, then the acceleration

limits defined with PUNCHACC refer to the reduced acceleration rate.

The function is deselected with:

S_min = S_max = 0

The acceleration rate programmed beforehand with ACC remains operative.

Block search

In the case of a search for a block containing a nibbling function, it is possible to program

whether the punch stroke is executed at the block beginning or suppressed.

The setting is programmed in machine data:

MD11450 $MN_SEARCH_RUN_MODE

Bit

Value

Meaning

Punch stroke at beginning of block is suppressed.

Punch stroke at beginning of block is executed.

References:

Function Manual, Basic Functions; Mode Group, Channel, Program Operation, Reset

Response (K1), Section:

11.3.3

Compatibility with earlier systems

Use of M functions

As in earlier versions, macro technology allows special M functions to be used instead of

language commands (compatibility).

The M functions and equivalent language commands as used in earlier systems are as follows:

M20, M23

≙

SPOF

M22

≙

SON

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11.3 Activation and deactivation

M25

≙

PON

M26

≙

PDELAYON

Note

M functions can be configured in machine data.

When M functions are assigned to language commands, it must be noted that M functions are

organized in auxiliary function groups.

Examples

DEFINE M20 AS SPOF

Punching/nibbling OFF

DEFINE M20 AS SPOF M=20

Punching with auxiliary function output

DEFINE M20 AS SPOF PDELAYOF Punching/nibbling OFF and punching with delay OFF

DEFINE M22 AS SON

Nibbling ON

DEFINE M22 AS SON M=22

Nibbling ON with auxiliary function output

DEFINE M25 AS PON

Punching ON

DEFINE M25 AS PON M=25

Punching ON with auxiliary function output

DEFINE M26 AS PDELAYON

Punching with delay ON

DEFINE M26 AS PDELAYON M=26 Punching and auxiliary function output

Programming example:

Program code

Comment

N100 X100 M20

; position without punch initiation

N110 X120 M22

; Activate nibbling, before and after motion

; stroke initiation

N120 X150 Y150 M25

; Activate punching, initiate stroke at end

; of the motion

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11.4 Automatic path segmentation

Program code

Comment

11.4

Automatic path segmentation

11.4.1

General information

Function

One of the following two methods can be applied to automatically segment a programmed

traversing path:

● Path segmentation with maximum path segment programmed via language command SPP

● Path segmentation with a number of segments programmed via language command SPN

Both functions generate sub-blocks independently.

In earlier systems

● SPP<number> corresponds to E<number>

● SPN<number> corresponds to H<number>

Since addresses E and H now represent auxiliary functions, language commands SPP and

SPN are used to avoid conflicts. The new procedure is therefore not compatible with those

implemented in earlier systems. Both language commands (SPP and SPN) can be configured.

Note

The values programmed with SPP are either mm or inch settings depending on the initial setting

(analogous to axes).

The automatic path segmentation function ensures that the path is divided into equidistant

sections with linear and circle interpolation.

When the program is interrupted and automatic path segmentation is active (SPP/SPN), the

contour can be reentered only at the beginning of the segmented block. The first punch stroke

is executed at the end of this sub-block.

SPP and SPN can be activated only if geometry axes are configured.

SPP

The automatic path segmentation function SPP divides the programmed traversing path into

sections of equal size according to the segment specification.

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11.4 Automatic path segmentation

The following conditions apply:

● Path segmentation is active only when SON or PON is active.

(Exception: MD26014 $MC_PUNCH_PATH_SPLITTING = 1)

● SPP is modally active, i.e. the programmed segment remains valid until it is programmed

again, but it can be suppressed on a block-by-block (non-modal) basis by means of SPN.

● The path segments are rounded off by the control system if required so that a total

programmed distance can be divided into an integral number of path sections.

● The path segment unit is either mm/stroke or inch/stroke (depending on axis settings).

● If the programmed SPP value is greater than the traversing distance, then the axis is

positioned on the programmed end position without path segmentation.

● SPP = 0, reset or program end delete the programmed SPP value. The SPP value is not

deleted when punching/nibbling is deactivated.

SPN

The automatic path segmentation function SPN divides the traversing path into the

programmed number of path segments.

The following conditions apply:

● Path segmentation is active only when SON or PON is active.

(Exception: MD26014 $MC_PUNCH_PATH_SPLITTING = 1)

● SPN has a non-modal action.

● Any previously programmed SPP value is suppressed for the block containing SPN, but is

re-activated again in the following blocks.

Supplementary conditions

● The path segmentation function is operative with linear and circular interpolation.

The interpolation mode remains unchanged, i.e. circles are traversed when circular

interpolation is selected.

● If a block contains both SPN (number of strokes) and SPP (stroke path), then the number

of blocks is activated in the current block while the stroke path is activated in all blocks that

follow.

● Path segmentation is active only in conjunction with punching or nibbling functions.

(Exception: MD26014 $MC_PUNCH_PATH_SPLITTING = 1).

● Any programmed auxiliary functions are output before, during the first or after the last sub-

block.

● In the case of blocks without traversing information, the rules which govern the

programming of SON and PON also apply to SPP and SPN. In other words, a stroke is initiated

only if an axis motion has been programmed.

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11.4 Automatic path segmentation

11.4.2

Operating characteristics with path axes

MD26010

All axes defined and programmed via machine data:

MD26010 $MC_PUNCHNIB_AXIS_MASK

are traversed along path sections of identical size with SPP and SPN until the programmed

end point is reached. This also applies to rotatable tool axes if programmed. The response

can be adjusted for single axes.

Example of SPP

Program code

Comment

N1 G01 X0 Y0 SPOF

; positioning without punch initiation

N2 X75 SPP=25 SON

; nibbling with feedrate value 25 mm; initiate punch

; before the first movement and after each

; path segment.

N3 Y10

; positioning with reduced SPP value, because

; traversing distance < SPP value, and initiate punch

; after the movement.

N4 X0

Reposition with punch initiation

after each path section.

633

If the programmed path segmentation is not an integral multiple of the total path, then the feed

path is reduced.

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11.4 Automatic path segmentation

633ಬ

633

;

X2/Y2:

Programmed traversing distance

SPP:

Programmed SPP value

SPP':

Automatically rounded-off offset distance

Figure 11-4

Path segmentation

Example of SPN

The number of path segments per block is programmed via SPN.

A value programmed via SPN takes effect on a non-modal basis for both punching and nibbling

applications. The only difference between the two modes is with respect to the first stroke.

This is normally executed at the beginning of the first segment with nibbling operations and at

its end with punching operations. This means that when n segments are programmed, n

strokes are executed with punching operations but n+1 with nibbling. Furthermore, where no

travel information is available, only a single stroke is executed, even if several are programmed.

Should it be necessary to generate several strokes at one position, then the corresponding

number of blocks without traversing information must be programmed.

Program code

Comment

N1 G01 X0 Y0 SPOF

; positioning without punch initiation

N2 X75 SPN=3 SON

; activate nibbling. The total path is

; divided into 3 path segments. Before the first

; movement and at the end of each path segment, a

; stroke is initiated.

N3 Y10 SPOF

; positioning without punch initiation

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11.4 Automatic path segmentation

Example

;

Figure 11-5

Workpiece

Extract from program

Program code

Comment

N100 G90 X130 Y75 F60 SPOF

; positioning to starting point (1) of the

; vertical nibbling path segments

N110 G91 Y125 SPP=4 SON

; end point coordinates (incremental)

; path segment: 4 mm, activate nibbling

N120 G90 Y250 SPOF

; absolute dimensioning, positioning at

; the start point (2) of the horizontal

; nibbling path segment

N130 X365 SPN=4 SON

; end point coordinates, 4 path segments,

; activate nibbling

N140 X525 SPOF

; positioning to starting point (3) of the

; inclined nibbling path

N150 X210 Y75 SPP=3 SON

; end point coordinates, path segment: 3

mm,

; activate nibbling

N160 X525 SPOF

; positioning to starting point (4) of the

; nibbling path on pitch circle path

N170 G02 G91 X-62.5 Y62.5 I0 J62.5 SON

; incremental circular interpolation with

; activate parameters,

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11.4 Automatic path segmentation

Program code

Comment

; nibbling

N180 G00 G90 Y300 SPOF

; positioning

11.4.3

Response in connection with single axes

MD26016

The path of single axes programmed in addition to path axes is distributed evenly among the

generated intermediate blocks as standard.

In the following example, the additional rotary axis C is defined as a synchronous axis.

If this axis is programmed additionally as a "Punch-nibble axis":

MD26010 $MC_PUNCHNIB_AXIS_MASK = 1,

, then the behavior of the synchronous axis can be varied as a function of machine data:

MD26016 $MC_PUNCH_PARTITION_TYPE

Programming example:

Program code

N10 G90 G1 PON X10 Y10 C0 F10000

N20 SPP=5 X25 C45

N30 G3 SPN=3 X35 Y20 I0 J10 C90

MD26016 $MC_PUNCH_PARTITION_TYPE=0 (default setting)

With this setting, the axes behave as standard, i.e. the programmed special axis motions are

distributed among the generated intermediate blocks of the active path segmentation function

in all interpolation modes.

In block N20, the C axis is rotated through 15° in each of the three intermediate blocks. The

axis response is the same in block N30, in the case of circular interpolation (three sub-blocks,

each with 15° axis rotation).

Extended Functions

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11.4 Automatic path segmentation

& r

[

MD26016 $MC_PUNCH_PARTITION_TYPE=1

In contrast to the behavior described above, here the synchronous axis travels the entire

programmed rotation path in the first sub-block of the selected path segmentation function.

Applied to the example, the C axis already reaches the programmed end position C=45 when

it reaches X position X=15. It behaves in the same way in the circular interpolation block below.

Extended Functions

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11.4 Automatic path segmentation

& r

[

MD26016 $MC_PUNCH_PARTITION_TYPE=2

MD26016=2 is set in cases where the axis must behave as described above in linear

interpolation mode, but according to the default setting in circular interpolation mode (see 1st

case).

The axis behavior for the example is then as follows: In block N20, the C axis is rotated to

C=45° in the first sub-block. The following circular interpolation block rotates the C axis through

15° in every sub-block.

Extended Functions

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11.4 Automatic path segmentation

& r

[

The axis response illustrated in the diagram above can be particularly useful when applied to

the axis of a rotatable tool in cases where it is used to place the tool in a defined direction (e.g.

tangential) in relation to the contour, but where the tangential control function must not be

applied. However, it is not a substitute for the tangential control function since the start and

end positions of the rotary axis must always be programmed.

Note

Additional offset motions of special axes (in this case, rotary axis C) are implemented via a

zero offset.

Extended Functions

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11.4 Automatic path segmentation

Supplementary conditions

● If the C axis is not defined as a "Punch-nibble axis", then the C axis motion path is not

segmented in block N30 in the above example nor is a stroke initiated at the block end.

● If the functionality described above is to be implemented in a variant not specific to nibbling

applications, but with alignment of the special axis, then stroke initiation can be suppressed

by the following PLC interface signal:

DB 21, 22 DBX3.2 (stroke suppression)

(Application: e.g. alignment of electron beam during welding)

A similar response can be programmed with the following machine data setting:

MD26014 $MC_PUNCH_PATH_SPLITTING=1

In this case, the path is segmented irrespective of punching or nibbling functions.

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11.5 Rotatable tool

11.5

Rotatable tool

11.5.1

General information

Function overview

The following two functions are provided for nibbling/punching machines with rotatable punch

and lower die:

● Coupled motion

for synchronous rotation of punch and die

● Tangential control

for normal alignment of rotary axes for punches in relation to workpiece

7RRO URWDU\ D[LV

6WDPS

'LH

Figure 11-6

Illustration of a rotatable tool axis

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11.5 Rotatable tool

11.5.2

Coupled motion of punch and die

Function

Using the standard function "Coupled motion", it is possible to assign the axis of the die as a

coupled motion axis to the rotary axis of the punch.

Activation

The "Coupled motion" function is activated or deactivated with language commands

TRAILON and TRAILOF respectively.

References:

Function Manual, Special Functions; Coupled Motion and ESR (M3)

Example

Example of a typical nibbling machine with rotatable punches where C is the punch axis and

C1 the die axis:

Program code

Comment

TRAILON (C1, C, 1)

; Enabling the coupled-motion grouping

G01 X100 Y100 C0 PON

; Initiate stroke with C axis /

; C1 axis position C=0=C1

X150 C45

; Initiate stroke with C axis /

; C1 axis position C=45=C1

M30

Basic position

No coupled-motion groupings are active after power up. Once the two tool axes have

approached the reference point, the coupled-motion grouping is not generally separated again.

This can be achieved by:

● Program single activation of the coupled-motion grouping (see example above)

● Program MD setting:

MD20110 $MC_RESET_MODE_MASK, bit 8=1

In this way, the coupled-motion grouping remains active after RESET/part program start or

end.

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11.5 Rotatable tool

11.5.3

Tangential control

Function

The "tangential control" function aligns the rotary axis used for positioning the punching/

nibbling tool so that it is tangential to the programmed path. In connection with tangential

control, this axis is called the tangential axis. The linear axes of the machining plane are the

leading axes of the tangential coupling. The tangential axis is the following axis that is aligned

to the path tangent of the lead axes. An additive offset angle for the tangent angle can also be

programmed for the tangential axis.

If the punching/nibbling tool (die and die plate) is moved via two separate rotary axes, the

second rotary axes can be coupled to the tangential axis via "coupled motion".

Note

Switch-on sequence

In the NC program, the tangential control must first be defined and then the coupled motion

must be activated.

References

A detailed description of the tangential control can be found in:

Function Manual, Special Functions, Chapter: "T3: Tangential control"

Example: Linear interpolation

Assumptions

● The punching/nibbling tool is subdivided into bottom and top tool

● The bottom tool and top tool are moved by different rotary axes (C/C1).

● The linear axes X and Y are the leading axes (machining plane G17)

Program code

Comment

N2 TANG (C, X, Y, 1, "B")

; definition tangential control

; leading axes: X, Y

; following axis: C

; coupling factor: 1

; basic coordinate system

N5 G0 X10 Y5

; starting position

N8 TRAILON (C1, C, 1)

; coupled motion ON

N10 Y10 C225 PON F60

; C/C1 axis → 225°

; nibbling initiation ON, → stroke

N15 X20 Y20 C45

; C/C1 axis → 45° → stroke

N20 X50 Y20 C90 SPOF

; C/C1 axis → 90°

; stroke initiation OFF

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11.5 Rotatable tool

Program code

Comment

N25

X80 Y20 SPP=10 SON

;

path segmentation: ON

;

path segment: 10 mm → 4 lifts

;

punch initiation: ON

N30

X60 Y40 SPOF

;

positioning

;

stroke initiation: OFF

N32

TANGON (C, 180)

;

tangential control: ON

;

offset angle: 180°

N35

X30 Y70 SPN=3 PON

;

path segmentation: 3 path segments → lift

;

nibbling initiation: ON

N40

G91 C45 X-10 Y-10

;

C/C1: 90° (-135°+180°+45°) → lift

N42

TANGON (C, 0)

;

tangential control: ON

;

offset angle: 0°

N45

G90 Y30 SPN=3 SON

;

path segmentation → 3 lifts

;

punch initiation: ON

N50

SPOF TANGOF

;

stroke initiation OFF

;

tangential control: OFF

N55

TRAILOF (C1, C)

;

coupled motion: OFF

N60

;

① Mounting position 0°

② Positioning

③ Stroke

Extended Functions

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11.5 Rotatable tool

Example: Circular interpolation

In circular interpolation mode, particularly when path segmentation is active, the tool axes

rotate along a path tangentially aligned to the programmed path axes in each sub-block.

Program code

Comment

N2 TANG (C, X, Y, 1, "B")

;

definition tangential control

;

leading axes: X, Y

;

following axis: C

;

coupling factor: 1

;

basic coordinate system

N5 G0 F60 X10 Y10

;

starting position

N8 TRAILON (C1, C, 1)

;

coupled motion: ON

N9 TANGON (C, -90)

;

tangential control: ON

;

offset angle: -90° or 270°

N10

G02 X30 Y30 I20 J0 SPN=2 PON

;

circular interpolation

;

path segmentation → 2 lifts

N15

G0 X70 Y10 SPOF

;

positioning

;

stroke initiation OFF

N17

TANGON (C, 90)

;

tangential control: ON

;

offset angle: 90°

N20

G03 X35,86 Y24,14 CR=20 SPP=16 SON

;

circular interpolation

;

path segmentation → 4 lifts

;

punch initiation: ON

N25

G0 X74.14 Y35.86 C0 PON

;

positioning

;

C/C1 axis: 0°

;

nibbling initiation: ON

N27

TANGON (C, 0)

;

tangential control: ON

;

offset angle: 0°

N30

G03 X40 Y50 I-14,14 J14,14 SPN=5 SON

;

circular interpolation

;

path segmentation → 5 lifts

;

punch initiation: ON

N35

G0 X30 Y65 C90 SPOF

;

positioning

;

stroke initiation OFF

N40

G91 X-10 Y-25 C180

;

positioning, incremental

;

C/C1 axis: +180°

;

≙ 270° absolute

N43

TANGOF

;

tangential control: OFF

N45

G90 G02 Y60 I0 J10 SPP=2 PON

;

circular interpolation

;

path segmentation → 2 lifts

N50

SPOF

;

stroke initiation OFF

N55

TRAILOF (C1, C)

;

coupled motion: OFF

N60

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11.7 Supplementary conditions

;

① Mounting position 0°

② Positioning

③ Stroke

11.6

Protection zones

Clamping protection zone

The "clamping protection zone" function is contained as a subset in the "Protection zones"

function. Its purpose is to simply monitor whether clamps and tool could represent a mutual

risk.

Note

No by-pass strategies are implemented for cases where the clamp protection is violated.

References:

Function Manual, Basic Functions; Axis Monitoring, Protection Zones (A3)

11.7

Supplementary conditions

Availability of function "Punching and nibbling"

The function is an option ("Punching and nibbling functions"), which must be assigned to the

hardware through the license management.

Extended Functions

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11.8 Examples

11.8

Examples

11.8.1

Examples of defined start of nibbling operation

Example 1

Example of defined start of nibbling operation

Program code

Comment

N10 G0 X20 Y120 SPP= 20

; Position 1 is approached

N20 X120 SON

; Defined start of nibbling, first stroke at

; "1", last stroke at "2"

N30 Y20

; Defined start of nibbling, first stroke at

; "3", last stroke at "4"

N40 X20

; Defined start of nibbling, first stroke at

; "5", last stroke at "6"

N50 SPOF

N60 M2

;

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11.8 Examples

Example 2

This example utilizes the "Tangential control" function. Z has been selected as the name of

the tangential axis.

Program code

Comment

N5 TANG (Z, X, Y, 1, "B")

; Define tangential axis

N8 TANGON (Z, 0)

; Select tangential control

N10 G0 X20 Y120

; Position 1 is approached

N20 X120 SPP=20 SON

; Defined start of nibbling,

; tangential control selected,

; first stroke at "1", last stroke at "2"

N30 SPOF TANGOF

; Deselect nibbling mode and deselect

; tangential control

N38 TANGON (Z, 90)

; Select tangential control

N40 Y20 SON

; Defined start of nibbling,

; tangential control selected,

; first stroke at "2" rotated 90 degrees to

; block N20, last stroke at "3"

N50 SPOF TANGOF

; Deselect nibbling mode and deselect

; tangential control

N60 M2

;

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11.8 Examples

Examples 3 and 4 for defined start of nibbling

Example 3: Programming of SPP

Program code

Comment

N5 G0 X10 Y10

; Positioning

N10 X90 SPP=20 SON

; Defined start of nibbling,

; 5 punches initiated

N20 X10 Y30 SPP=0

; One punch is initiated at the end of the path

N30 X90 SPP=20

; 4 punches initiated at intervals of 20 mm

N40 SPOF

N50 M2

Example 4 Programming of SPN

Program code

Comment

N5 G0 X10 Y10

; Positioning

N10 X90 SPN=4 SON

; Defined start of nibbling, 5

; 5 punches initiated

N20 X10 Y30 PON

; One punch is initiated at the end of the path

N30 X90 SPN=4

; 4 punches initiated

N40 SPOF

N50 M2

;

Figure 11-7

Examples 3 and 4 for defined start of nibbling

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11.8 Examples

Examples 5 and 6 without defined start of nibbling

Example 5 Programming of SPP

Program code

Comment

N5 G0 X10 Y30

; Positioning

N10 X90 SPP=20 PON

; No defined start of nibbling,

; 4 punches initiated

N15 Y10

; One punch is initiated at the end of the path

N20 X10 SPP=20

; 4 punches initiated at intervals of 20 mm

N25 SPOF

N30 M2

Example 6 Programming of SPN

Program code

Comment

N5 G0 X10 Y30

; Positioning

N10 X90 SPN=4 PON

; No defined start of nibbling,

; 4 punches initiated

N15 Y10

; One punch is initiated at the end of the path

N20 X10 SPN=4

; 4 punches initiated

N25 SPOF

N30 M2

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11.8 Examples

Example 7 Application example of SPP programming

;

Figure 11-8

Workpiece

Extract from program:

Program code

Comment

N100 G90 X75 Y75 F60 PON

; Positioning to starting point (1) of the

; vertical line of holes, punch single hole

N110 G91 Y125 SPP=25 PON

; End point coordinates (incremental),

; path segment: 25 mm, activate punching

N120 G90 X150 SPOF

; Absolute dimensioning, position at

; the start point (2) of the horizontal line of

holes

N130 X375 SPP=45 PON

; End point coordinates, path segment: 45 mm

N140 X275 Y160 SPOF

; Positioning to starting point (3) of the

; oblique line of holes

N150 X150 Y75 SPP=40 PON

; End point coordinates, programmed

; path segment: 40 mm, calculated

; path segment: 37.39 mm

N160 G00 Y300 SPOF

; Positioning

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11.9 Data lists

11.9

Data lists

11.9.1

Machine data

11.9.1.1

General machine data

Number

Identifier: $MN_

Description

11450

SEARCH_RUN_MODE

Block search parameter settings

11.9.1.2

Channelspecific machine data

Number

Identifier: $MC_

Description

20150

GCODE_RESET_VALUES[n]

Reset G groups

26000

PUNCHNIB_ASSIGN_FASTIN

Hardware assignment for input-byte with stroke control

26002

PUNCHNIB_ASSIGN_FASTOUT

Hardware assignment for output-byte with stroke con-

trol

26004

NIBBLE_PUNCH_OUTMASK[n])

Mask for quick output bits

26006

NIBBLE_PUNCH_INMASK[n]

Mask for quick input bits

26008

NIBBLE_PUNCH_CODE[n]

Determination of the M functions

26010

PUNCHNIB_AXIS_MASK

Definition of punching and nibbling axes

26012

PUNCHNIB_ACTIVATION

Activation of punching and nibbling functions

26014

PUNCH_PATH_SPLITTING

Activation of automatic path segmentation

26016

PUNCH_PARTITION_TYPE

Behavior of single axes with active automatic path seg-

mentation

26018

NIBBLE_PRE_START_TIME

Automatically activated pre-initiation time

26020

NIBBLE_SIGNAL_CHECK

Monitoring of the input signal

11.9.2

Setting data

11.9.2.1

Channelspecific setting data

Number

Identifier: $SC_

Description

42400

PUNCH_DWELL_TIME

Dwell time

42402

NIBPUNCH_PRE_START_TIME

Pre-start time

42404

MINTIME_BETWEEN_STROKES

Minimum time interval between two consecutive

strokes

Extended Functions

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11.9 Data lists

11.9.3

Signals

11.9.3.1

Signals to channel

Signal name

SINUMERIK 840D sl

SINUMERIK 828D

No stroke enable

DB21,

DBX3.0

Manual stroke initiation

DB21,

DBX3.1

Stroke suppression

DB21,

DBX3.2

Stroke inoperative

DB21,

DBX3.3

Delayed stroke

DB21,

DBX3.4

Manual stroke initiation

DB21,

DBX3.5

11.9.3.2

Signals from channel

Signal name

SINUMERIK 840D sl

SINUMERIK 828D

Stroke initiation active

DB21,

DBX38.0

Acknowledgement of manual stroke initiation

DB21,

DBX38.1

11.9.4

Language commands

G group

Language com-

Meaning

mand

SPOF

Stroke / Punch OFF

Punching and nibbling OFF

SON

Stroke ON

Nibbling ON

SONS

Stroke ON

Nibbling ON (position controller)

PON

Punch ON

Punching ON

PONS

Punch ON

Punching ON (position controller)

PDELAYON

Punch with Delay ON

Punching with delay ON

PDELAYOF

Punch with Delay OFF

Punching with delay OFF

Path segmentation

SPP

Path per stroke, modal action

SPN

Number of strokes per block, non-modal action

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P2: Positioning axes

12.1

Product brief

Axes for auxiliary movements

In addition to axes for machining a workpiece, modern machine tools can also be equipped

with axes for auxiliary movements, e.g.:

● Axis for tool magazine

● Axis for tool turret

● Axis for workpiece transport

● Axis for pallet transport

● Axis for loader (also multi-axis)

● Axis for tool changer

● Axis for sleeve assembly / end support

The axes for the workpiece machining are called path axes. Within the channel they are guided

by the interpolator such that they start simultaneously, accelerate, reach the end point and

stop together.

Axes for auxiliary movements are traversed independently of the path axes at a separate, axis-

specific feedrate. In the past, many of these axes were moved hydraulically and started by an

auxiliary function in the part program. With the closed-loop axis control implemented in the

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P2: Positioning axes

12.1 Product brief

NC, the axis can be addressed by name in the part program and its actual position displayed

on the screen.

Note

"Positioning axis/Auxiliary spindle" option

Axes for auxiliary movements must not be interpolating ("full-value") NC axes. Auxiliary

movements may also be carried out using special axes, which can be obtained using the

"Positioning axis/Auxiliary spindle" option.

Functional restrictions

Optional positioning axes/auxiliary spindles have fewer functions. The following functions are

not possible:

● Using the axis as a path axis, geometry axis, or special path axis

● Incorporating the axis into the geometry axis grouping (GEOAX)

● Rigid thread cutting and tapping

Commissioning

As standard, axes are defined as interpolating axes:

MD30460 $MA_BASE_FUNCTION_MASK bit 8 = 0

If an axis is to be operated as a positioning axis/auxiliary spindle with reduced functionality,

the value for bit 8 must be set to "1":

MD30460 $MA_BASE_FUNCTION_MASK bit 8 = 1

Function

The "positioning axes" function makes it easier to integrate axes for auxiliary movement into

the control system:

● during programming:

The axes are programmed together with the axes for workpiece machining in the same part

program, without having to sacrifice valuable machining time.

There are special (POS, POSA) traversing instructions.

● during program testing/start-up:

Program testing and start-up are performed simultaneously for all axes.

● during operation:

Operation and monitoring of the machining process commence simultaneously for all axes.

● during PLC configuring/commissioning:

No allowance has to be made on PLC or external computers (PCs) for synchronization

between axes for machining and axes for auxiliary movements.

● during system configuring:

A second channel is not required.

Extended Functions

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P2: Positioning axes

12.2 Own channel, positioning axis or concurrent positioning axis

Motions and interpolations

Each channel has one path interpolator and at least one axis interpolator with the following

interpolation functions:

● for path interpolator:

Linear interpolation (G1), circular interpolation (G2 / G3), spline interpolation, etc.

● for axis interpolator:

If a positioning axis is programmed, an axis interpolator starts in the control (with linear

interpolation G1).

● End-of-motion criterion:

The programmed end position of a positioning axis has been reached when the end-of-

motion criterion FINEA, COARSA or IPOENDA is fulfilled.

● Path axes with rapid traverse movement:

Path axes can be traversed in linear or non-linear interpolation mode with rapid traverse

movement (G0).

References:

Function Manual, Basic Functions; Chapter "B1: Continuous-path mode, Exact stop,

LookAhead"

● Autonomous singleaxis operations:

Single PLC axes, command axes started via static synchronized actions or asynchronous

reciprocating axes can be interpolated independently of the NC.

An axis/spindle interpolated by the main run then reacts independently of the NC program.

The channel response triggered by the program run is decoupled to transfer the control of

a certain axis / spindle to the PLC.

● Control by PLC:

All channel-specific signals normally act to the same extent on path and positioning axes.

Positioning axes can be controlled via additional, axis-specific signals.

PLC axes are traversed by the PLC via special function blocks in the basic program; their

movements can be asynchronous to all other axes. The travel motions are executed

separate from the path and synchronized actions.

12.2

Own channel, positioning axis or concurrent positioning axis

When axes are provided for auxiliary movements on a machine tool, the required properties

will decide whether the axis is to be:

● programmed in an internal part program (see Section "Own channel (Page 686)").

● programmed in the same part program as the machining operation (see Section

"Positioning axis (Page 686)").

● started exclusively by the PLC during machining (see Section "Concurrent positioning

axis (Page 689)").

Extended Functions

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P2: Positioning axes

12.2 Own channel, positioning axis or concurrent positioning axis

12.2.1

Own channel

A channel represents a self-contained NC which, with the aid of a part program, can be used

to control the movement of axes, spindles and machine functions independently of other

channels.

Non-dependence between channels

Independence between channels is assured by means of the following provisions:

● An active part program per channel

● Channel-specific interface signals such as

- DB21, ... DBX7.1 (NC Start)

- DB21, ... DBX7.3 (NC stop)

- DB21, ... DBX7.7 (reset)

● one feedrate override per channel

● One rapid traverse override per channel

● Channel-specific evaluation and display of alarms

● Channel-specific display, e.g. for

- Actual axis positions

- Active G commands

- Active auxiliary functions

- Current program block

● Channel-specific testing and channel-specific control of programs:

- Single block

- Dry run (DRY RUN)

- Block search

- Program test

References

For more information on the channel functionality, please refer to:

Function Manual, Basic Functions; BAG, Channel, Program Operation, Reset Response (K1)

12.2.2

Positioning axis

Positioning axes are programmed together with path axes, i.e. with the axes that are

responsible for workpiece machining.

Commands for positioning axes and path axes can be included in the same NC block. Although

they are programmed in the same NC block, the path and positioning axes are not interpolated

Extended Functions

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P2: Positioning axes

12.2 Own channel, positioning axis or concurrent positioning axis

together and do not reach their end point simultaneously (no direct time relationship, see also

Chapter "Motion behavior and interpolation functions (Page 690)").

Positioning axis types and block change

The block change time depends on the programmed positioning axis type (refer also to Chapter

"Block change (Page 702)"):

Type

Description

The block change occurs when all path and positioning axes have reached their programmed

end point.

The block change occurs when all path axes have reached their programmed end point.

With positioning axis type 2, it is possible to approach the programmed end point across sev-

eral block limits.

It is possible to set the block change within the braking ramp of the single axis interpolation if

the criteria for the motion end and the block change are fulfilled for the path interpolation.

Motion synchronization

Positioning axes permit movements to be activated from the same machining program and

such movements to be synchronized at block limits (type 1) or at explicit points by means of

a WAITP command (type 2).

Motion end criterion for block change in the brake ramp

For single-axis interpolation, it is also possible to set another end-of-motion criterion for the

block change in the braking ramp.

Traverse path axes in G0 as positioning axis

Each path axis can be traversed as positioning axis in rapid traverse movement (G0). Thus all

axes travel to their end point independently.

In this way, two sequentially programmed X and Z axes are treated like positioning axes in

conjunction with G0. The block change to axis Z can be initiated by axis X as a function of the

braking ramp time setting (100-0%). Axis Z starts to move while axis X is still in motion. Both

axes approach their end point independently of one another.

Axis types

Positioning axes can be linear axes and rotary axes.

Positioning axes can also be configured as indexing axes.

Independence of positioning axes and path axes

The mutual independence of positioning and path axes is ensured by the following measures:

● No shared interpolation

● Each positioning axis has a dedicated axis interpolator

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P2: Positioning axes

12.2 Own channel, positioning axis or concurrent positioning axis

● Dedicated feedrate override for each positioning axis

● Dedicated programmable feedrate

● Dedicated "axis-specific delete distance-to-go" interface signal

Dependencies

Positioning axes are dependent in the following respects:

● A shared part program

● Starting of positioning axes only at block boundaries in the part program

● With rapid traverse movement G0 path axes traverse as positioning axes in one of two

different modes

● No rapid traverse override

● The following interface signals act on the entire channel and therefore on positioning axes:

- DB21, ... DBX7.1 (NC start)

- DB21, ... DBX7.3 (NC stop)

- DB21, ... DBX7.7 (reset)

- DB21, ... DBX6.1 (read-in disable)

● Alarms specific to program and channel also deactivate positioning axes.

● Program control (dry run feed, program test, DRF, ... etc.) also act on positioning axes

● Block search and single block also act on positioning axes.

● The last block with a programmed end-of-motion criterion that was processed in the search

run serves as a container for setting all axes.

● Group 1 (modal movement commands) of the G commands (i.e. G0, G1, G2, ...) does not

apply to positioning axes.

References:

Programming Manual Fundamentals.

Applications

The following are typical applications for positioning axes:

● Single-axis loaders

● Multi-axis loaders without interpolation (PTP → point-to-point traversing)

● Workpiece feed and transport

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12.2 Own channel, positioning axis or concurrent positioning axis

Other applications are also possible:

● With G0 workpiece delivery and workpiece transport can travel to their end points

independently of one another.

● On machines with several machining processes in sequence: Significant reduction in

individual machining steps due to block change in the braking ramp of the single-axis

interpolation.

Note

Positioning axes are not suitable for multi-axis loaders that require interpolation between

the axes (path interpolator).

12.2.3

Concurrent positioning axis

Concurrent positioning axes are positioning axes with the following properties:

● Activation from the PLC need not take place at block limits, but can be implemented at any

time in any operating mode (even when a part program is already being processed in the

channel).

● Program command WAITP is required to move a concurrent positioning axis from the part

program immediately after power ON.

● The part program continues to run uninhibited, even if the concurrent positioning axis has

not reached the position defined by the PLC.

● An automatic axis change is possible, depending on the setting in the machine data

MD30552 $MA_AUTO_GET_TYPE.

● With programming commands:

- GET(<axis>) or WAITP(<axis>) becomes a concurrent positioning axis of the

channel axis again.

- "RELEASE (axis)" or WAITP(<axis>) is a channel axis that becomes a concurrent

axis under PLC control.

Activation from PLC

For SINUMERIK 840D sl, the concurrent positioning axis is activated via FC 18 from the PLC.

● Feedrate

For feedrate = 0, the feedrate is determined from the following machine data:

MD32060 $MA_POS_AX_VELO (initial setting for positioning axis velocity)

● Absolute dimensions (G90), incremental dimensions (G91)

Absolute dimensions along shortest path for rotary axes (<rotary axis

name>=DC(<value>))

The following functions are defined:

● Linear interpolation (G1)

● Feedrate in mm/min or degrees/min (G94)

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● Exact stop (G9)

● Settable zero offsets currently selected are valid

Applications

Typical applications for concurrent positioning axes include:

● Tool magazines with manual loading and unloading during machining

● Tool magazines with tool preparation during machining

12.3

Motion behavior and interpolation functions

12.3.1

Path interpolator and axis interpolator

Path interpolator

Every channel has a path interpolator for a wide range of interpolation modes such as linear

interpolation (G1), circular interpolation (G2/G3), spline interpolation etc.

Axis interpolator

Each channel has axis interpolators in addition to path interpolators. The maximum number

corresponds to the maximum number of existing channel axes.

If a positioning axis is programmed, an axis interpolator starts in the control with straight line

interpolation G1. This axis interpolator runs independently of the path interpolator until the

programmed end position of the positioning axis has been reached.

There is no time relationship between the path interpolator and the axis interpolator, nor

between the axis interpolators.

Path control mode (G64) is not possible with positioning axes.

The programmed end position of a positioning axis has been reached when the end-of-motion

criterion FINEA, COARSA or IPOENDA is fulfilled.

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12.3 Motion behavior and interpolation functions

12.3.2

Autonomous singleaxis operations

Functionality

Single PLC axes, command axes started via static synchronized actions or asynchronous

reciprocating axes can be interpolated independently of the NC. An axis/spindle interpolated

by the main run then reacts independently of the NC program with respect to:

● NC stop

● Alarm handling

● Program control

● End of program

● RESET

Boundary conditions

Axes/spindles currently operating according to the NC program are not controlled by the PLC.

Command axis movements cannot be started via non-modal or modal synchronized actions

for PLC-controlled axes/spindles. Alarm 20143 is signaled.

Transfer axis control to the PLC

Description of the sequence

1. PLC → NC: Request to control the axis

DB31, ... DBX28.7 = 1 (PLC controls axis)

2. NC: Checks whether the axis is a main run axis or a neutral axis.

3. NC: Checks whether an additional axis may be controlled from the PLC.

4. NC confirms the transfer:

- DB31, ... DBX63.1 = 1 (PLC controls the axis)

- System variable $AA_SNGLAX_STAT = 1

Result: The PLC controls the axis/spindle.

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Alternatives

Initial state: The axis is controlled by the PLC. As a result of a channel stop, the channel is in

the "interrupted" state.

● Axis state "inactive" ⇒

- The stop state is canceled.

- If the axis is started, this directly results in axis motion.

● Axis state "active" ⇒

- The stop state is not canceled.

- Generate the axis state according to Use case 2 "Stop axis".

- Resume axis motion according to Use case 3 "Continue axis motion".

● A reset is performed in the channel ⇒

This process is asynchronous to control acceptance by the PLC. The two previously

mentioned alternatives can occur or the axis is assigned to the channel and is reset.

Boundary conditions

Axes/spindles, traversed by an NC program, cannot be transferred to the PLC. Axes/spindles,

which are traversed by static synchronized actions or as oscillating axis, as neutral axis,

concurrent positioning axis or command axis, can be transferred.

Relinquish axis control by the PLC

Description of the sequence:

1. PLC → NC: The PLC returns axis control to the NC

DB31, ... DBX28.7 = 0 (PLC controls axis)

2. NC: Checks whether an axial alarm is present.

3. NC: Checks whether a movement has been activated that has still not been completed? If

yes, then the movement is stopped with an axial stop according to Use case 2 "Stop axis/

spindle".

4. NC: Carries out an axial reset corresponding to Use case 4 "Reset axis/spindle".

5. NC confirms the acceptance:

DB31, ... DBX63.0 = 0 (reset executed)

DB31, ... DBX63.1 = 0 (PLC controls the axis)

DB31, ... DBX63.2 = 0 (axis stop active)

System variable $AA_SNGLAX_STAT = 0

Result: The NC has now taken over control of the axis/spindle.

Alternatives

In the following cases the NC confirms the transfer - but internally sets the "stopped" channel

state for the axis/spindle:

● The channel is in the "interrupted" state

● A stop alarm is active for the channel

● A stop alarm is active for the mode group

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SINUMERIK 840D sl. Service - Functions. Manual (2018-2020) - page 40