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14. ABSOLUTE POSITION DETECTION SYSTEM
(b) Checksum error
If the checksum error occurs, the programmable controller should retry transmission of the ABS data.
Using the ladder check program of the programmable controller, turn OFF the ABS transfer mode
(ABSM). After a lapse of 10ms or longer, turn OFF the servo-on (SON) (OFF time should be longer than
20ms) and then turn it ON again.
If the ABS data transmission fails to end normally even after retry, regard this situation as an ABS
checksum error and execute error processing.
The start command should be interlocked with the ABS data ready signal to disable positioning
operation when an checksum error occurs.
20ms
or longer
OFF
ON
OFF
ON
OFF
ON
OFF
ON
10ms
or longer
20ms
or longer
20ms
or longer
Retry 1 Retry 2 Retry 3
10ms
or longer
10ms
or longer
10ms
or longer
Servo-on
Yes
No
ABS transfer mode
ABS reques
t
ABS send data ready
ABS checksum erro
r