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MELSEC-Q
6 PLC PROGRAM USED FOR POSITIONING CONTROL
Servo ON conditions
Setting of servo parameter
PLC READY signal Y0 ON
All axis servo ON Y1 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.
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 QD75MH preparation completed X0
All axis servo ON ON All axis servo is ON Y1
Synchronization flag ON
QD75MH buffer memory
Accessible
X1
Axis stop signal OFF Axis stop signal is OFF. Y4 Y5 Y6 Y7
M code ON signal OFF M code ON signal is OFF. X4 X5 X6 X7
Error detection signal OFF There is no error X8 X9 XA XB
BUSY signal OFF BUSY signal is OFF. XC XD XE XF
Interface
signal
Start complete signal OFF Start complete signal is OFF. X10 X11 X12 X13
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 –
External
signal
Lower limit (RLS) ON Within limit range –
: 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.