Mitsubishi A1SD75P2-S3 - Page 288

8 - 13
MELSEC-A
8 ZERO POINT RETURN CONTROL
(3) If the zero point signal is input before the workpiece stops at the stopper, the
workpiece will stop at that position, and that position will be regarded as the
zero point.
At this time, an error will not occur.
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t
ON
OFF
ON
OFF
OFF
ON
V
ON
Zero point signal
0
Torque limit
Valid torque limit range
Pr. 49 Creep speed
Pr. 48 Zero point return speed
Near-point dog OFF
Machine zero point return start
(Positioning start signal)
Deviation counter clear output
Md.35 Axis operation status
Standing by
Inconsistent
Value the machine moved is stored
Zero point return request flag
[ Md.40 Status : b3]
Zero point return complete flag
[ Md.40 Status : b4]
Md.44 Movement amount
after near-point dog ON
Md.29 Current feed value
Md.30 Machine feed value
Standing by
Zero point address
Inconsistent
In zero point return
Stopper
Fig. 8.8 Operation when the zero point signal is input before the stop at the stopper
(4) Machine zero point returns started while the near-point dog is ON will start at
the "
Pr.49 Creep speed".
(5) If the restart command is turned ON after machine zero point return is stopped
upon a stop signal, an error “zero point return restart not possible” (error code:
209) occurs.
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