Mitsubishi Electric MELSERVO MR-J2S- A Instruction Manual page 320

15. ABSOLUTE POSITION DETECTION SYSTEM
3) ABS transfer mode finish-time time-out check
If the ABS transfer mode (ABSR) is not turned OFF within 5s after the last ready to send signal
(19th signal for ABS data transmission) is turned ON, it is regarded as the transmission error
and the ABS time-out warning (AL.E5) is output.
ABS transfer mode
ABS request
Send data ready
AL.E5 warning
(b) Check sum error
If the check sum error occurs, the programmable controller should retry transmission of the ABS
data.
Using the ladder check program, turn OFF the ABS transfer mode (ABSM) and servo-on (SON)
once. Turn them ON again after an OFF time of longer than 20 ms.
If the ABS data transmission fails to end normally even after retry, regard this situation as an
ABS check sum error and execute error processing.
The start command should be interlocked with the ABS data ready signal to disable positioning
operation when an check sum error occurs.
Servo-on
ABS transfer mode
ABS request
Send data ready
ABS check sum error
ON
OFF
1
ON
OFF
ON
1
OFF
Yes
No
20ms
or more
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Yes
No
Signal is not turned OFF
2 3 4
2 3 4
20ms 20ms
or more or more
Retry 1 Retry 2
15 - 13
5s
18 19
18 19
Retry 3