Mitsubishi Electric MELSEC-L LD75D, User Manual

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11.3.4
Creating a program to enable/disable the inching operation
A program must be created to execute an inching operation. Consider the "required control data setting", "start
conditions", and "start time chart" when creating the program.
The following shows an example when an inching operation is started for axis 1. (The example shows the inching
operation when a "10.0

m" is set in "[Cd.16] Inching movement amount".)
(1) Required control data setting
The control data shown below must be set to execute an inching operation. The setting is carried out with the
program.
Refer to  Page 211, Section 5.7 for the information on detail settings.
(2) Start conditions
The following conditions must be fulfilled when starting. The required conditions must also be assembled in the
program, and the program must be configured so the operation will not start if the conditions are not fulfilled.
*1 If the CPU module is set to the asynchronous mode in the synchronization setting, this must be inserted in the program
for interlocking. If it is set to the synchronous mode, it must not be inserted in the program for interlocking because it is
turned ON when the CPU module executes calculation.
Setting item
Setting
value
Setting details
Buffer memory address
Axis 1 Axis 2 Axis 3 Axis 4
[Cd.16]
Inching
movement
amount
100
Set the setting value so that the command pulse is not increased
larger than the maximum output pulse.
(The max. output pulse
LD75D
 : 4Mpulse/s
LD75P  : 200kpulse/s)
1517 1617 1717 1817
Signal name Signal state
Device
Axis 1 Axis 2 Axis 3 Axis 4
Interface signal
PLC READY signal ON CPU module preparation completed Y0
LD75 READY signal ON LD75 preparation completed X0
Synchronization flag
*1
ON LD75 buffer memory accessible X1
Axis stop signal OFF Axis stop signal is OFF. Y4 Y5 Y6 Y7
Start complete signal OFF Start complete signal is OFF. X10 X11 X12 X13
BUSY signal OFF LD75 is not operating XC XD XE XF
Positioning complete signal OFF Positioning complete signal is OFF X14 X15 X16 X17
Error detection signal OFF There is no error X8 X9 XA XB
M code ON signal OFF M code ON signal is OFF. X4 X5 X6 X7
External signal
Drive unit READY signal ON Drive unit preparation completed

Stop signal OFF Stop signal is OFF. 
Upper limit (FLS) ON Within limit range 
Lower limit (RLS) ON Within limit range
