FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION)

10. SPINDLE SPEED FUNCTION

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Item No. 0000 (SPEED ARRIVAL ON) on the diagnosis screen is kept at 1 while this function is keeping
the cutting feed block at a halt.

Reading actual spindle speeds by PMC window

The actual speed of the serial spindles can be read by PMC window (function code 138). Actual spindle
speed is calculated by multiplying the ratio of the gear and motor speed. The gear which is in use is
distinguished by the following signals.

Table 10.5 (d) Gear selection status

Gear

number

Bit 1 (SLG) of parameter No.3787

Clutch/gear signals

(serial spindle)

M type

gear selection method

T type

gear selection method

Gear selection signals

CTH1

CTH2

GR3O

GR2O

GR1O

GR2

GR1

"0"

"1"

"0"

"1"

"0"

"1"

"0"

"1"

"0"

"1"

"0"

"1"

"0"

"1"

Analog spindle

Gain and offset

The analog spindle may require gain and offset voltage adjustment depending on the spindle motor speed
amplifier being used.
The following parameters are available for such adjustment.

Gain adjustment data: Parameter No. 3730
Offset voltage compensation: Parameter No. 3731

Spindle enable signal ENB<Fn001.4>

Another output related to spindle control is the spindle enable signal ENB.
The ENB signal is logical “1” when a nonzero command output is sent to the spindle. If the command is
logical 0, the ENB signal becomes logical “0”.
When the analog spindle is being used, an offset voltage in the spindle motor speed amplifier may cause
the spindle motor to rotate at low speed even if the command output (in this case, analog voltage) to the
spindle is zero. The ENB signal can be used to stop the motor in such a case.

Electrical specification of analog spindle interface

The ENB1/2 signal on the analog spindle interface is an interface signal that is turned on and off under
the same conditions as of the spindle enable signal <Fn001.4>, and it can be used even when a serial
spindle is used.
For related signals on the analog spindle interface, refer to the description of the analog spindle interface
in the section of the spindle connection in "Connection Manual (Hardware)".

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Signal

Spindle stop signal *SSTP<Gn029.6>

[Classification] Input signal

[Function] The command output to the spindle is disabled.

[Operation] When the spindle stop signal turns to “0”, the output voltage becomes 0V and the enable

signal ENB turns to “0” (M05 is not output).
When this signal turns to “1”, the analog voltage returns to its original value and the ENB
signal turns to “1”.

The above time chart is an example. Actually, the time chart should meet the specification
of the spindle control unit.
-

When this signal is not used, always set the signal to “1”.

When the M03, M04, or M05 command is issued, the CNC outputs the code signal
and strobe signal only.

Spindle orientation signal SOR<Gn029.5>

[Classification] Input signal

[Function] The spindle or the spindle motor is rotated at a constant

[Operation] When the spindle orientation signal turns to “1” and the spindle stop signal *SSTP turns

to “0”, a spindle speed command which lets the spindle rotate at the constant speed set by
parameter No. 3732 is output. The enable signal ENB also turns to “1”. This signal is
disabled when the spindle stop signal is “1”.
In the machining center system, when the spindle speed for orientation is set by bit 1
(GST) of parameter No. 3705 and the SOR signal is input, the CNC outputs the spindle
speed command corresponding to the speed set to parameter 3732 with an output polarity
set by bit 5 (ORM) of parameter No. 3706, but the gear select signal does not change.
For example, if the SOR signal is turned to 1 with high gear selected, and the speed set to
parameter No. 3732 is in the low gear range, the gear select signal does not change and
the command output is calculated and output to obtain the set speed at high gear.
When the spindle motor speed is set by bit 1 (GST) of parameter No. 3705=1, the
command output is output regardless of gear select signal. When the spindle motor speed
is set, it is used for gear shift.
Example of usage is shown below:

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Spindle speed override signals SOV0 to SOV7<Gn030>

[Classification] Input signal

[Function] The spindle speed override signal specifies an override from 0% to 254% in 1% units for

the S command sent to the CNC.

[Operation] An override value in binary must be set in 8 bits from SOV7 to SOV0.

The spindle speed override function is disabled (an override of 100% is applied) under
the following conditions:
-

Tapping cycle (M series : G84, G74 T series : G84, G88)

Thread cutting (M series : G33 T series : G32, G92, G76)

→

When this function is not in use, specify an override of 100%; otherwise, an override

of 0% becomes effective, thus disabling the spindle from rotating.

Spindle speed arrival signal SAR<Gn029.4>

[Classification] Input signal

[Function] The SAR signal initiates cutting feed. In other words, if the signal is logical “0”, cutting

feed will not start.

[Operation] Generally, this signal is used to inform the CNC that the spindle has reached the specified

speed.
For this purpose, the signal must be set to “1” only after the actual speed of the spindle
has reached the specified speed.
Setting parameter No. 3740 with a wait time before the start of checking the SAR signal
inhibits cutting feed from starting under a condition of SAR = “1” specified before the
change of the spindle command.
To use the SAR signal, it is necessary to set bit 0 (SAR) of parameter No. 3708 to 1.
The CNC checks the SAR signal under the following conditions:
a.

Bit 0 (SAR) of parameter No. 3708 is set to 1.

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Before starting distribution of the first feed (move command) block after shifting
from the rapid traverse mode to the cutting feed mode. This checking is performed
after the time set by parameter No. 3740 has elapsed after the feed block is read.

Before starting distribution of the first feed command block after an S code is
commanded. The wait time for checking is the same as in item b.

When an S code and feed are programmed in the same block, the S code (or
command output to the spindle) is output, and the SAR signal is checked after a
fixed time elapses. If the SAR signal is set to “1”, feed begins.

CAUTION

According to the conditions of item d above, note that if the circuit
is so designed that SAR is turned to “0” simultaneously with the
output of an S code and the change of spindle speed is initiated by
the DEN signal, the operation will stop. That is, the spindle speed
does not reach the commanded speed because the CNC is waiting
for the DEN signal and distribution is not started because the CNC
is waiting for the SAR signal.

Spindle enable signal ENB<Fn001.4>

[Classification] Output signal

[Function] Informs absence or presence of spindle output command.

[Output cond.] The ENB signal becomes logical “0” when the command output to the spindle becomes

logical 0. Otherwise, the signal is logical “1”.
During analog spindle control, S0 may not be able to stop the spindle from rotating at low
speed because of an offset voltage in the spindle motor speed control amplifier. In such a
case, the ENB signal can be used to provide a condition to determine whether to stop the
motor.
The analog spindle interface has electric signals (ENB1 and ENB2) similar to the ENB.
These signals work under the same conditions as with the ENB signal.
The ENB signal can be used also for serial spindle control.

Gear selection signals GR1O, GR2O, GR3O<Fn034.0 to .2>

[Classification] Output signal

[Function] The gear select signal specifies a gear stage to the PMC.

[Output cond.] For details of this signal, see descriptions on the M type gear selection method in

"Overview."

Gear selection signals GR1, GR2<Gn028.1, .2>

[Classification] Input signal

[Function] This signal informs the CNC of the gear stage currently selected.

[Operation] For details of this signal, see descriptions on the T type gear selection method in

"Overview."

S12-bit code signals R01O to R12O<Fn036.0 to Fn037.3>

[Classification] Output signal

[Function] These signals convert the spindle speed command value calculated by the CNC to code

signals 0 to 4095.

[Output cond.] The relationship between the spindle speed command value (calculated by the CNC) and

the value output by this signal is as shown below.

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These signals convert the spindle speed command value calculated by the spindle control
function of the CNC to data from 0 to 4095 (for both serial and analog spindle control)
and outputs the result. This does not match the command set by spindle output control of
the PMC. (See "SPINDLE OUTPUT CONTROL BY THE PMC".)

Other signals

Spindle speed function code signals S00 to S31<Fn022 to Fn025> (Output)
Spindle speed function strobe signal SF<Fn007.2> (Output)

See "SPINDLE SPEED FUNCTIONS" and "SPINDLE OUTPUT CONTROL BY THE PMC" for these
signals.

Signal address

Gn028

GR2

GR1

Gn029

*SSTP

SOR

SAR

Gn030

SOV7

SOV 6

SOV5

SOV4

SOV3

SOV2

SOV1

SOV0

Fn001

ENB

Fn007

Fn022

S07

S06

S05

S04

S03

S02

S01

S00

Fn023

S15

S14

S13

S12

S11

S10

S09

S08

Fn024

S23

S22

S21

S20

S19

S18

S17

S16

Fn025

S31

S30

S29

S28

S27

S26

S25

S24

Fn034

GR3O

GR2O

GR1O

Fn036

R08O

R07O

R06O

R05O

R04O

R03O

R02O

R01O

Fn037

R12O

R11O

R10O

R09O

Parameter

3705

EVS

ESF

SFA

NSF

SGT

SGB

GST

ESF

[Input type] Parameter input

[Data type] Bit path

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#0 ESF

When the spindle control function (Spindle analog output or Spindle serial output) is used,

and the constant surface speed control function is used or bit 4 (GTT) of parameter No.
3706 is set to 1:
0:

S codes and SF are output for all S commands.

For the T series:

S codes and SF are not output for an S command in the constant surface speed
control (G96) mode and a command for maximum spindle speed clamping
(G92 S_; (G50 for G code system A)).

For the M series:

S codes and SF are not output for an S command in the constant surface speed
control (G96) mode.

NOTE

The operation of this parameter varies between the T series and M
series.
For the T series:

This parameter is valid when bit 4 (EVS) of parameter No. 3705
is set to 1.

For the M series:

For an S command for maximum spindle speed clamping
(G92 S_;), SF is not output, regardless of the setting of this
parameter.

#1 GST

The SOR signal is used for:

Spindle orientation

Gear shift

#2 SGB

Gear switching method is:

Method A (Parameters Nos. 3741 to 3743 for the maximum spindle speed at each
gear are used for gear selection.)

Method B (When bit 2 (MCH) of parameter No. 3790 is set to 0, parameters Nos.
3751 to 3752 are used for gear selection. When bit 2 (MCH) of parameter No. 3790
is set to 1, parameters Nos. 3753 to 3754 are used for gear selection).

#3 SGT

Gear switching method during tapping cycle (G84 and G74) is:

Method A (Same as the normal gear switching method)

Method B (Gears are switched during tapping cycle according to the spindle speed
set in parameters Nos. 3761 and 3762).

#4 EVS

When the spindle control function (Spindle analog output or Spindle serial output) is used,

S codes and SF are:
0:

Not output for an S command.

Output for an S command.

The output of S codes and SF for an S command in constant surface speed control mode
(G96), or for an S command used to specify maximum spindle speed clamping (G92 S_;
(G50 for G code system A)) depends on the setting of bit 0 (ESF) of parameter No. 3705.

#5 NSF

For the M series, when a T type gear is selected (with bit 4 (GTT) of parameter No. 3706

set to 1 or constant surface speed control is enabled (bit 0 (SSC) of parameter No. 8133 is
1)), and an S code is specified:
0:

SF is output.

SF is not output.

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NOTE

This parameter does not affect S code output. For an S command
for maximum spindle speed clamping (G92 S_;), SF is not output,
regardless of the setting of this parameter.

#6 SFA

The SF signal is output:

When gears are switched.

Irrespective of whether gears are switched.

3706

TCW

CWM

ORM

TCW

CWM

ORM

GTT

[Input type] Parameter input

[Data type] Bit path

#4 GTT

Spindle gear selection method is:

Type M.

Type T.

NOTE

1 M type

The gear selection signal is not input. The CNC selects a gear
based on the speed range of each gear set by a parameter
beforehand according to S codes, and the selected gear is posted
by outputting the gear selection signal. Moreover, the spindle
speed matching the gear selected by the output gear selection
signal is output.

T type

The gear selection signal is input. The spindle speed matching the
gear selected by this signal is output.

2 When the constant surface speed control is enabled (bit 0 (SSC) of

parameter No. 8133 is 1), type T is selected, regardless of whether
this parameter is specified.

3 When type T spindle gear switching is selected, the following

parameters have no effect:
No.3705#2(SGB), No.3751, No.3752,
No.3705#1(GST), No.3705#3(SGT), No.3761, No.3762,
No.3705#6(SFA), No.3735, No.3736
On the other hand, parameter No. 3744 becomes usable.

#5 ORM

Voltage polarity during spindle orientation

Positive

Negative

#6 CWM

#7 TCW

Voltage polarity when the spindle speed voltage is output

TCW

CWM

Voltage polarity

Both M03 and M04 positive

Both M03 and M04 negative

M03 positive, M04 negative

M03 negative, M04 positive

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3708

TSO

SAT

SAR

TSO

SAR

[Input type] Parameter input

[Data type] Bit path

#0 SAR

The spindle speed arrival signal SAR is:

Not checked

Checked

#1 SAT

Check of the spindle speed arrival signal SAR at the start of executing the thread cutting

block
0:

The signal is checked only when bit 0 (SAR) of parameter No. 3708 is set to 1.

The signal is always checked irrespective of the setting of SAR.

NOTE

When thread cutting blocks are consecutive, the spindle speed
arrival signal is not checked for the second and subsequent thread
cutting blocks.

#6 TSO

During a threading or tapping cycle, the spindle override is:

Disabled (tied to 100%).

Enabled.

NOTE

During rigid tapping, the override is tied to 100%, irrespective of the
setting of this parameter.

3709

SAM

[Input type] Parameter input

[Data type] Bit path

#0 SAM

The sampling frequency to obtain the average spindle speed

4 (Normally, set to 0.)

3712

GMB

[Input type] Parameter input

[Data type] Bit

#6 GMB

With type-M gear switching method B, the speed of each gear is clamped to:

0 : The maximum rotation speed (No. 3741 to No. 3743) of each gear or the maximum

clamping speed (No. 3736) of the spindle motor.

1 : Each gear switching point by parameters Nos. 3751 to 3752 in case of bit 2 (MCH)

of parameter No. 3790 is set to 0. Each gear switching point by parameters Nos.
3753 to 3754 in case of bit 2 (MCH) of parameter No. 3790 is set to 1.

FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION) - page 192