12 - 7
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
(d) Setting the dwell time for a zero point return retry
With the zero point return retry function, the dwell time can be set for
reverse run operation started at detection of the upper/lower limit signal and
for a machine zero point return executed after a stop by near-point dog OFF
when a zero point return retry is made.
"
Pr.58 Dwell time during zero point return retry" is made valid when the
operation stops in position "A" of the following figure. (The dwell times in
positions A and B are the same values.)
Machine zero point return
executed again
Near-point dog
Zero point
Stop by near-point
dog OFF
Stop by limit
signal detection
Reverse run operation
after limit signal detection
B
Zero point
Zero point return direction
Machine zero point
return start
A
Limit signal OFF
Pr.46
Fig. 12.4 Setting the dwell time during a zero point return retry
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