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12 CONTROL SUB FUNCTIONS
Machine OPR
executed again
Stop by near-point
dog OFF
Near-point dog
(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 and 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".)
B
Zero signal
Fig. 12.3 Setting the dwell time during an OPR retry
Pr. 44 OPR direction
OP
Machine OPR start
Reverse run operation
after limit signal detection
Limit signal OFF
12 - 6
MELSEC-Q
Stop by limit
signal detection
A
Hardware limit switch
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