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6 PLC PROGRAM USED FOR POSITIONING CONTROL
Interface
signal
External
signal
: When the synchronous setting of the PLC CPU is made in the nonsynchronous mode, this must be
provided as an interlock.
When it is made in the synchronous mode, no interlock must be provided in the program because the
flag is turned ON when calculation is run on the PLC CPU.
Servo ON conditions
Setting of servo parameter
PLC READY signal
All axis servo ON
Starting conditions
To start the control, the following conditions must be satisfied.
The necessary start conditions must be incorporated in the PLC program so that
the control is not started when the conditions are not satisfied.
Signal name
PLC READY signal
QD75 READY signal
All axis servo ON
Synchronization flag
Axis stop signal
M code ON signal
Error detection signal
BUSY signal
Start complete signal
Forced stop input signal
Stop signal
Upper limit (FLS)
Lower limit (RLS)
Y0 ON
Y1 ON
Signal state
ON PLC CPU preparation completed
ON QD75MH preparation completed
ON All axis servo is ON
QD75MH buffer memory
ON
Accessible
OFF Axis stop signal is OFF.
OFF M code ON signal is OFF.
OFF There is no error
OFF BUSY signal is OFF.
OFF Start complete signal is OFF.
ON There is no forced stop input
OFF Stop signal is OFF.
ON Within limit range
ON Within limit range
6 - 56
MELSEC-Q
Device
Axis 1 Axis 2 Axis 3 Axis 4
Y0
X0
Y1
X1
Y4
Y5
Y6
Y7
X4
X5
X6
X7
X8
X9
XA
XB
XC
XD
XE
XF
X10
X11
X12
X13
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