12 - 6
MELSEC-Q
12 CONTROL SUB FUNCTIONS
(3) Setting the dwell time during an OPR retry
The OPR retry function can perform such function as the dwell time using
"
Pr.57
Dwell time at OPR retry" when the reverse run operation is carried
out due to detection by the limit signal for upper/lower limits and when the
machine OPR is executed after the near point dog is turned OFF to stop the
operation.
"
Pr.57
Dwell time during OPR" is validated when the operation stops at
the "A" and "B" positions in the following drawing. (The dwell time is the
same value at both positions "A" and "B".)
Machine OPR
executed again
Stop by near-point
dog OFF
Stop by limit
signal detection
Reverse run operation
after limit signal detection
B
OP
Pr. 44 OPR direction
Machine OPR start
A
Limit signal OFF
Near-point dog
Zero signal
Fig. 12.3 Setting the dwell time during an OPR retry
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