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4 POSITIONING SIGNALS
REMARK
(Note-1): Refer to APPENDIX 1.4 for the error codes on errors detected at the servo
amplifier side.
(8) 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:
• Motion CPU 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
• Major error [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.
Operation in G28 of the Motion program changes by the ON/OFF of the
home position return request signal.
When home position return request
signal is OFF
The axis starts from the current position, passes through the
specified mid point, and returns to the home position at high-
speed feed rate.
When home position return request
signal is ON
Proximity dog, count, data set, dog cradle, stopper or limit
switch combined type home position return is executed in
accordance with the home position returun data.
CAUTION
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 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.