Mitsubishi Electric MELSEC iQ-R Series User Manual page 86

Homing request
The homing request will be TRUE in the following cases.
The reason why the homing request became TRUE is recorded in event history.
Absolute position
*1
control setting
Common
Not use the absolute
position system
Use the absolute
position system
*1 For the "-1: Auto" setting, refer based on the connected device setting.
*2 When the homing required setting is FALSE, the homing request will not become TRUE even though the cause is occurring at the
current position restoration.
2 AXIS MANAGEMENT FUNCTIONS
84
2.6 Absolute Position Control
Cause
The axis type is changed.
The machine homing is started.
(The homing request flag will not become FALSE unless the machine homing is
normally completed.)
The axis driver unit conversion (numerator/denominator) is changed.
The system power is turned ON or reset.
The current position restoration is executed.
Since the absolute position data has been erased by the memory error, etc., the
warning "Absolute Position Data Incorrect Warning" (warning code: 0D00H) is
occuring.
Change of the driver and the motor encoder is detected.
Only real "Polarity (607EH)" b7: position polarity of the driver object is
drive axis changed.
An electric gear of the driver side is changed.
"Absolute position erased" is detected in the driver side.
*2
Detection timing
At the current position restoration
At the machine homing start
At the PLC READY [Y0] ON
At the system power ON/reset
At the current position restoration
At the current position restoration
At the current position restoration and cause
occuring