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FANUC Series 30i/300i/300is-MODEL A. Machining Center System. User's manual - page 258

A.PARAMETERS

APPENDIX

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1772

Acceleration change time of bell-shaped acceleration/deceleration before

interpolation

[Input type] Parameter input

[Data type] 2-word path

[Unit of data] msec

[Valid data range] 0 to 200

Set an acceleration change time of bell-shaped acceleration/
deceleration before interpolation (time for changing from the state of
constant feedrate (A) to the state of constant acceleration/deceleration
(C) at the acceleration rate calculated from the acceleration rate set in
parameter No. 1660: time of (B) in the figure below).

Feedrate in tangent direction

Optimum inclination is
automatically calculated from the
setting of parameter No. 1660.

Time set by parameter No. 1772

(A) (B)

(B)

(A)

(C)

1783

Maximum allowable feedrate difference for feedrate determination based on

corner feedrate difference

[Input type] Parameter input

[Data type] Real axis

[Unit of data] mm/min, inch/min, degree/min (machine unit)

[Minimum unit of data] Depend on the increment system of the applied axis

[Valid data range] Refer to the standard parameter setting table (C)

(When the increment system is IS-B, 0.0 to +999000.0)
If a feedrate component change for each axis exceeding the value set
in this parameter occurs at the joint of blocks, the feedrate
determination function based on corner feedrate difference finds a
feedrate not exceeding the set value and performs deceleration by
using acceleration/deceleration before interpolation. Thus, a shock to
the machine and machining error at a corner can be reduced.

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A.PARAMETERS

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1788

Maximum allowable acceleration change rate in feedrate determination

based on acceleration change for each axis

[Input type] Parameter input

[Data type] Real axis

[Unit of data] mm/sec

, inch/sec

, degree/sec

(machine unit)

[Minimum unit of data] Depend on the increment system of the applied axis

[Valid data range] Refer to the standard parameter setting table (D)

1789

Maximum allowable acceleration change rate in feedrate determination

based on acceleration change for each axis (linear interpolation)

[Input type] Parameter input

[Data type] Real axis

[Unit of data] mm/sec

, inch/sec

, degree/sec

(machine unit)

[Minimum unit of data] Depend on the increment system of the applied axis

[Valid data range] Refer to the standard parameter setting table (D)

(When the machine system is metric system, 0.0 to +100000.0. When
the machine system is inch system, machine, 0.0 to +10000.0.)
Set a maximum allowable acceleration change rate for each axis in
feedrate control based on acceleration change under control on the rate
of change of acceleration in successive linear interpolation operations.
In feedrate control based on acceleration change at a corner between
linear interpolation operations, the maximum allowable acceleration
change rate not set in parameter No. 1788 but set in this parameter is
valid.
For an axis with 0 set in this parameter, the maximum allowable
acceleration change rate set in parameter No. 1788 is valid.
Feedrate control based on acceleration change is disabled for an axis
with 0 set in parameter No. 1788, so that the setting of this parameter
for such an axis is ignored.

A.PARAMETERS

APPENDIX

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1790

Ratio of change time of the rate of change of acceleration in smooth

bell-shaped acceleration/deceleration before interpolation

[Input type] Parameter input

[Data type] Byte path

[Unit of data] %

[Valid data range] 0 to 50

Set the ratio of the change time of the rate of change of acceleration to
the change time of acceleration(*1) by percentage (%) in smooth
bell-shaped acceleration/deceleration before look-ahead interpolation.
If 0 is set in this parameter or a value not within the valid data range is
specified in this parameter, smooth bell-shaped acceleration/
deceleration before look-ahead interpolation is not performed.

(*1)

Parameter No. 1772 for acceleration/deceleration before
look-ahead interpolation (cutting feed).

Parameter No. 1672 for acceleration/deceleration before

interpolation in linear rapid traverse, or for optimum torque
acceleration/ deceleration.

#7 #6 #5 #4 #3 #2 #1 #0

1802

DC2x

DC4x

[Input type] Parameter input

[Data type] Bit axis

# 1

DC4x

When the reference position is established on the linear scale with

reference marks:
0: An absolute position is established by detecting three reference

marks.

1: An absolute position is established by detecting four reference

marks.

# 2

DC2x

Reference position establishment operation for a linear scale with

reference marks is performed as follows:
0: The setting of bit 1 (DC4) of parameter No. 1802 is followed.
1: An absolute position is established by detecting two

reference marks.

NOTE

1 When this parameter is set to 1, specify the

direction of the scale zero point by setting bit 4
(SCP) of parameter No. 1817.

2 When a rotary encoder with absolute address

reference marks is used, this parameter is invalid.
Even when this parameter is set to 1, the setting of
bit 1 (DC4) of parameter No. 1802 is followed.

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A.PARAMETERS

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#7 #6 #5 #4 #3 #2 #1 #0

1815

APCx

APZx

DCRx

OPTx

[Input type] Parameter input

[Data type] Bit axis

NOTE

When at least one of these parameters is set, the
power must be turned off before operation is
continued.

# 1

OPTx

Position

detector

0: A separate pulse coder is not used.
1: A separate pulse coder is used.

NOTE

Set this parameter to 1 when using a linear scale
with reference marks or a linear scale with an
absolute address zero point (full-closed system).

# 3

DCRx

As a scale with absolute address reference marks:

0: A rotary encoder with absolute address reference marks is not

used.

1: A rotary encoder with absolute address reference marks is used.

NOTE

When using a rotary encoder with absolute address
reference marks, set also bit 2 (DCLx) of parameter
No. 1815 to 1.

# 4

APZx

Machine position and position on absolute position detector when the

absolute position detector is used
0: Not

corresponding

1: Corresponding
When an absolute position detector is used, after primary adjustment
is performed or after the absolute position detector is replaced, this
parameter must be set to 0, power must be turned off and on, then
manual reference position return must be performed. This completes
the positional correspondence between the machine position and the
position on the absolute position detector, and sets this parameter to 1
automatically.

# 5

APCx

Position

detector

0: Other than absolute position detector
1: Absolute position detector (absolute pulse coder)

A.PARAMETERS

APPENDIX

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#7 #6 #5 #4 #3 #2 #1 #0

1817

TANx

[Input type] Parameter input

[Data type] Bit axis

NOTE

When this parameter is set, the power must be
turned off before operation is continued..

# 6

TANx

Tandem

control

0: Not

used

1: Used

NOTE

Set this parameter to both master axis and slave
axis.

#7 #6 #5 #4 #3 #2 #1 #0

1818

SDC

RF2x

RFSx

[Input type] Parameter input

[Data type] Bit axis

# 0

RFSx

If G28 is specified for an axis for which a reference position is not

established (ZRF = 0) when a linear scale with an absolute address
zero point or a linear scale with absolute address reference marks is
used:
0: A movement is made to the reference position after reference

position establishment operation.

1: No movement is made after reference position

establishment operation, but the operation is completed.

NOTE

This parameter disables movement based on the
G28 command to a reference position. So, use this
parameter only in special cases.

# 1

RF2x

If G28 is specified for an axis for which a reference position is already

established (ZRF = 1) when a linear scale with an absolute address
zero point or a linear scale with absolute address reference marks is
used:
0: A movement is made to the reference position.
1: No movement is made to the intermediate position and

reference position, but the operation is completed.

NOTE

This parameter disables movement based on the
G28 command to a reference position. So, use this
parameter only in special cases.

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APPENDIX

A.PARAMETERS

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# 3

SDCx

A linear scale with an absolute address zero point is:

0: Not

used.

1: Used.

#7 #6 #5 #4 #3 #2 #1 #0

1819

DATx

[Input type] Parameter input

[Data type] Bit axis

# 2

DATx

When a linear scale with an absolute address zero point or a linear

scale with absolute address reference marks is used, the automatic
setting of parameter No. 1883 and No. 1884 at manual reference
position return time is:
0: Not

performed.

1: Performed.

The automatic setting procedure is as follows:
<1> Set an appropriate value in parameter No. 1815, No. 1821, and

No. 1882.

<2> Position the machine at the reference position by manual

operation.

<3> Set this parameter to 1.
<4> Perform a manual reference position return operation. Upon

completion of manual reference position return operation,
parameter No. 1883 and No. 1884 are set, and this parameter is
automatically set to 0.

A.PARAMETERS

APPENDIX

B-63944EN/03

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1820

Command multiplier for each axis (CMR)

NOTE

When this parameter is set, the power must be
turned off before operation is continued.

[Input type] Parameter input

[Data type] Byte axis

[Valid data range] See below :

Set a command multiplier indicating the ratio of the least command
increment to the detection unit for each axis.
Least command increment = detection unit

command multiplier

Relationship between the increment system and the least command
increment
(1) T

series

Least input increment

Least command

increment

0.001 mm

(diameter specification) 0.0005 mm

Millimeter
input

0.001 mm

(radius specification) 0.001 mm

0.0001 inch

(diameter specification) 0.0005 mm

Millimeter
machine

Inch input

0.0001 inch

(radius specification) 0.001 mm

0.001 mm

(diameter specification) 0.00005 inch

Millimeter
input

0.001 mm

(radius specification) 0.0001 inch

0.0001 inch

(diameter specification) 0.00005 inch

Inch
machine

Inch input

0.0001 inch

(radius specification) 0.0001 inch

IS-B

Rotation axis

0.001 deg

Least input increment

Least command

increment

0.0001 mm

(diameter specification) 0.00005 mm

Millimeter
input

0.0001 mm

(radius specification) 0.0001 mm

0.00001 inch

(diameter specification) 0.00005 mm

Millimeter
machine

Inch input

0.00001 inch

(radius specification) 0.0001 mm

0.0001 mm

(diameter specification) 0.000005 inch

Millimeter
input

0.0001 mm

(radius specification) 0.00001 inch

0.00001 inch

(diameter specification) 0.000005 inch

Inch
machine

Inch input

0.00001 inch

(radius specification) 0.00001 inch

IS-C

Rotation axis

0.0001 deg

Least input increment

Least command

increment

0.00001 mm

(diameter specification) 0.000005 mm

Millimeter
input

0.00001 mm

(radius specification) 0.00001 mm

0.000001 inch (diameter specification) 0.000005 mm

Millimeter
machine

Inch input

0.000001 inch

(radius specification) 0.00001 mm

0.00001 mm

(diameter specification) 0.0000005 inch

Millimeter
input

0.00001 mm

(radius specification) 0.000001 inch

0.000001 inch (diameter specification) 0.0000005 inch

Inch
machine

Inch input

0.000001 inch

(radius specification) 0.000001 inch

IS-D

Rotation axis

0.00001 deg

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APPENDIX

A.PARAMETERS

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Least input increment

Least command

increment

0.000001 mm (diameter specification) 0.0000005 mm

Millimeter
input

0.000001 mm

(radius specification) 0.000001 mm

0.0000001 inch (diameter specification) 0.0000005 mm

Millimeter
machine

Inch input

0.0000001 inch

(radius specification) 0.000001 mm

0.000001 mm (diameter specification) 0.00000005 inch

Millimeter
input

0.000001 mm

(radius specification) 0.0000001 inch

0.0000001 inch (diameter specification) 0.00000005 inch

Inch
machine

Inch input

0.0000001 inch

(radius specification) 0.0000001 inch

IS-E

Rotation axis

0.000001 deg

(2) M

series

Least input increment and least command increment

Increment

system

IS-A

IS-B IS-C IS-D IS-E Unit

Millimeter
machine

0.01 0.001 0.0001 0.00001 0.000001 mm

Millimeter
input

0.001

0.0001 0.00001 0.000001 0.0000001 inch

Rotation
axis

0.01 0.001 0.0001 0.00001 0.000001 deg

Setting command multiply (CMR), detection multiply (DMR), and the
capacity of the reference counter

least
command
increment

CMR

Error counter

Converter

DMR

Position
detector

Reference counter

Command pulse

Feedback
pulse

Detection
unit

To
velocity
control

Set CMR and DMR so that the pulse weight of + input (command
from the CNC) into the error counter matches the pulse weight of
-input (feedback from the position detector).
[Least command increment]/CMR=[Detection unit]=
[Feedback pulse unit]/DMR

[Least command increment]:

Minimum unit of commands issued from the CNC to the
machine

[Detection unit]: Minimum unit for machine position detection

The unit of feedback pulses varies, depending on the type of detector.
[Feedback pulse unit]=[Amount of travel per rotation of the pulse
coder]/[Number of pulses per rotation of the pulse coder]

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