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14. ABSOLUTE POSITION DETECTION SYSTEM
Note 1. For the dog type home position return. Need not be connected for the data set type home position return.
2. If the servo motor provided with the zero point signal is started, the A1SD75 will output the deviation counter clear (CR). Therefore,
do not connect the clear (CR) of the MR-J3-A to the A1SD75 but connect it to the output module of the programmable controller.
3. This circuit is provided for your reference.
4. The electromagnetic brake output should be controlled via a relay connected to the programmable controller output.
5. This connection diagram applies to the differential line driver system as a pulse input system. Refer to section 3.8.2 (3)(b) and
A1SD75P
-S3 Positioning Module User’s Manual (IB(NA)66716) for the open collector system.
6. To enhance noise immunity, connect LG and pulse output COM.
(2) Sequence program example
(a) Conditions
The ABS data is transmitted using the leading edge of the servo-on switch as a trigger.
1) When the servo-on switch and power supply GND are shorted, the ABS data is transmitted at power-
on of the servo amplifier or on the leading edge of the RUN signal after a PC reset operation (PC-
RESET). The ABS data is also transmitted when an alarm is reset or when an emergency stop is
reset.
Before starting the ABS data transfer, confirm that it is the servo-on (SON) ON state (refer to section
3.3.2).
2) If a checksum mismatch is detected in the transmitted data, data transmission is retried up to three
times. If the checksum mismatch still persists after the retries, the ABS checksum error occurs (Y3A
ON).
3) The following time periods are measured. If the ON/OFF state does not change within the specified
time, the ABS communication error occurs change within the specified time, the ABS communication
error occurs (Y3A ON).
ON period of ABS transfer mode (Y31)
ON period of ABS request (Y32)
OFF period of reading to send ABS data (X22)