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7 ABSOLUTE POSITION DETECTION SYSTEM
7.3 Absolute position detection system by DIO [A]
• SON-off, RES-on, and EM2-off check during the ABS transfer
If the ABS transfer mode is turned on, and after the transfer starts, if SON-off, RES-on, or EM2-off before the 19th ABST is on,
this will be treated as a transmission error and [AL. 0E5] occurs.
• Checksum error
If the checksum error is detected, retry the transmission of the absolute position data.
Using the sequence check program of the programmable controllers, turn off ABSM, and after a lapse of 10 ms or longer, turn
SON off once (off time longer than 20 ms is required), then turn on SON again.
If the absolute position data transmission is not completed normally even after retry, perform the ABS checksum error and
error processing.
When a checksum error occurs, the start command should be interlocked with ABST to disable the positioning operation.
The following shows an example of three retries are performed.
OFF
ON
OFF
ON
OFF
ON
OFF
ON
12341819
1
2341819
SON (Servo-on)
ABSM (ABS transfer mode)
ABSR (ABS request)
ABST (ABS transmission data ready)
Alarm
[AL. 0E5 ABS time-out warning]
No alarm
OFF
ON
OFF
ON
OFF
ON
OFF
ON
20 ms or more 20 ms or more
20 ms or more
Retry 1 Retry 2 Retry 3
SON (Servo-on)
10 ms or more 10 ms or more 10 ms or more 10 ms or more
ABSM (ABS transfer mode)
ABSR (ABS request)
ABST (ABS transmission data ready)
Alarm
ABS checksum error
No alarm
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