Mitsubishi Electric MELSEC-Q Series User Manual page 567

When both the "forward run JOG start signal" and "reverse run JOG start
signal" are turned ON simultaneously for one axis
When both the "forward run JOG start signal" and "reverse run JOG start signal"
are turned ON simultaneously for one axis, the "forward run JOG start signal" is
given priority. In this case, the "reverse run JOG start signal" is validated when the
BUSY signal of Simple Motion module is turned OFF.
If the forward run JOG operation is stopped due to stop by a stop signal or axis
error, the reverse run JOG operation will not be executed even if the "reverse run
JOG start signal" turns ON.
Cd.181 Forward run JOG start
Cd.182 Reverse run JOG start
BUSY signal [X10 to X1F] OFF
Fig. 11.8 Operation when both the forward run JOG start signal and reverse run JOG start signal are
turned ON simultaneously
ON
OFF
ON
OFF
The reverse run JOG
start signal is ignored.
ON
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Chapter 11 Manual Control
Forward run JOG operation
Reverse run JOG operation
t