Mitsubishi Electric Q172CPU Programming Manual page 50

4 POSITIONING DEDICATED SIGNALS
When using the absolute position system function, on starting up, and when the Motion
controller or absolute value motor has been replaced, always perform a home position return
in real mode. In the case of the absolute position system, use the PLC program to check the
home position return request before performing the positioning operation.
Failure to observe this could lead to an accident such as a collision.
(5) Home position return request signal (M2409+20n)
This signal turns on when it is necessary to confirm the home position address
at the power supply on or during positioning control.
(a) When not using an absolute position system
1) This signal turns on in the following cases:
• Motion CPU power supply on or reset
• During a home position return
2) This signal turns off by the completion of home position return.
(b) When using an absolute position system
1) This signal turns on in the following cases:
• During a home position return
• Backup data (reference value) sum check error occurence
(power supply on).
2) This signal turns off by the completion of home position return.
(6) Home position return complete signal (M2410+20n)
(a) This signal turns on when the home position return operation using the
servo program has been completed normally.
(b) This signal turns off at the positioning start, JOG operation start and manual
pulse generator operation start.
(c) If the home position return of proximity dog, dog cradle or stopper type
using the servo program is executed during this signal on, the "continuous
home position return start error (minor error: 115)" occurs and it cannot be
start the home position return.
CAUTION
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.............. Status signal
.............. Status signal