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8 ZERO POINT RETURN CONTROL
Machine zero point return start
(Positioning start signal)
Zero point return request flag
[RX(n+1)F, RX(n+4)F]
Zero point return complete flag
[RX(n+2)0, RX(n+5)0]
Deviation counter clear output
Axis operation status
[RWrn+7, RWrn+15]
Md.44 Movement amount
after near-point dog ON
Current feed value
[RWrn+0 to 1, RWrn+8 to 9]
Md.30 Machine feed value
Fig. 8.5 Operation when the dwell time elapses before the stop at the stopper
(3) If the " Pr.51 Zero point return dwell time" elapses before the stop at the
stopper, the workpiece will stop at that position, and that position will be
regarded as the zero point.
V
Near-point dog OFF
ON
OFF
ON
OFF
OFF
Standing by
In zero point return
Inconsistent
0
Inconsistent
Value the machine moved is stored
(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.
Pr. 48 Zero point return speed
Valid torque limit range
Torque limit
ON
Dwell time measurement
8 - 10
MELSEC-A
Pr. 49 Creep speed
Stopper
Time out of dwell time
ON
Standing by
Zero point address
t
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