Mitsubishi Electric MELSEC Q Series Programming Manual page 66

3 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 the case of the absolute position system, use the sequence program to check the home
position return request before performing the positioning control.
Failure to observe this could lead to an accident such as a collision.
(10) Home position return request signal (M2409+20n)
This signal turns on when it is necessary to confirm the home position address.
(a) When not using an absolute position system
1) This signal turns on in the following cases:
• Multiple CPU system power supply on or reset
• Servo amplifier power supply on
• Home position return start
(Unless a home position return is completed normally, the home
position return request signal does not turn off.)
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:
• When not executing a home position return once after system start.
• Home position return start
(Unless a home position return is completed normally, the home
position return request signal does not turn off.)
• Erase of an absolute data in Motion CPU according to causes, such
as battery error
• Servo error [2025] (absolute position erase) occurrence
• Servo error [2143] (absolute position counter warning) occurrence
• Servo error [2913] (encoder counter error) occurrence
• Major error [1201], [1202], [1203], or [1204] occurrence
• When the "rotation direction selection" of servo parameter is changed.
2) This signal turns off by the completion of the home position return.
(11) 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 method
using the servo program is executed during this signal on, the a minor
error (error code: 115) occurs, and home position return cannot start.
................................. Status signal
CAUTION
................................. Status signal
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