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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. 8.8 Operation when the zero point signal is input before the stop at the stopper
(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.
V
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
Zero point signal
Valid torque limit range
Torque limit
ON
Near-point dog OFF
8 - 13
MELSEC-A
Pr. 49 Creep speed
Stopper
ON
Standing by
Zero point address
t
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