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 switches for upper and lower limits and
when the 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".)
OPR
executed again
Stop by near-point
dog OFF
Stop by limit
switch detection
Reverse run operation
after limit switch detection
B
OP
Pr. 44 OPR direction
OPR start
A
Limit switch OFF
Near-point dog
Zero signal
H/W limit switch
Fig. 12.3 Setting the dwell time during an OPR retry
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