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15. ABSOLUTE POSITION DETECTION SYSTEM
3) ABS transfer mode finish-time time-out check
If the ABS transfer mode signal 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.
OFF
ON
OFF
ON
OFF
ON
12341819
12341819
5s
A
BS transfer mode
A
BS request
Send data ready
A
L.E5 warning
Signal is not turned OFF
No
Yes
(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)
signals 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.
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Servo-on
ABS transfer mode
ABS request
Send data ready
ABS check sum error
20ms
or more
20ms
or more
20ms
or more
Retry 1Retry 2Retry 3
No
Yes