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Chapter 11 Manual Control
11.3.4 Creating a program to enable/disable the inching operation
A sequence 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 µm" is set in "[Cd.16] Inching
movement amount".)
Required control data setting
The control data shown below must be set to execute an inching operation. The
setting is carried out with the sequence program.
Setting item
Setting
value
Setting details
Buffer memory address
QD77MS2
QD77MS4
QD77MS16
[Cd.16]
Inching movement
amount
100
Set the setting value so that the JOG speed
limit value is not increased larger than the
maximum output pulse
1517+100n 4317+100n
n: Axis No.-1
: Refer to Section 5.7 "List of control data" for information on setting details.
Start conditions
The following conditions must be fulfilled when starting. The required conditions
must also be assembled in the sequence program, and the sequence program
must be configured so the operation will not start if the conditions are not fulfilled.
Signal name Signal state
Device
QD77MS2
QD77MS4
QD77MS16
Interface
signal
PLC READY signal ON PLC CPU preparation completed Y0
READY signal ON QD77MS preparation completed X0
All axis servo ON ON All axis servo ON Y1
Synchronization flag ON
Accessible to QD77MS buffer
memory
X1
Axis stop signal OFF Axis stop signal is OFF Y4 to Y7 [Cd.180] Axis stop
Start complete signal OFF Start complete signal is OFF X10 to X13 [Md.31] Status: b14
BUSY signal OFF QD77MS is not operating XC to XF X10 to X1F
Positioning complete
signal
OFF
Positioning complete signal is
OFF
X14 to X17 [Md.31] Status: b15
Error detection signal OFF There is no error X8 to XB [Md.31] Status: b13
M code ON signal OFF M code ON signal is OFF X4 to X7 [Md.31] Status: b12
External
signal
Forced stop input signal ON There is no forced stop input –
Stop signal OFF Stop signal is OFF –
Upper limit (FLS) ON Within limit range –
Lower limit (RLS) ON Within limit range –
: If the PLC CPU 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 PLC CPU executes
calculation.