MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 462)

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MELSEC-Q
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.
Buffer memory address
Setting item
Setting
value
Setting details 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 maximum output pulse is 1
Mpps for QD75D
: differential drive output
system), or 200 kpps for QD75P : open
collector output system.)
1517 1617 1717 1817
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.
Device
Signal name Signal state
Axis
1
Axis
2
Axis
3
Axis
4
PLC READY signal ON PLC CPU preparation completed Y0
QD75 READY signal ON QD75 preparation completed X0
Synchronization flag ON
Accessible to QD75 buffer
memory
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 QD75 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
Interface
signal
M code ON signal OFF M code ON signal is OFF X4 X5 X6 X7
Drive unit READY signal ON Drive unit preparation completed –
Stop signal OFF Stop signal is OFF –
Upper limit (FLS) ON Within limit range –
External
signal
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.