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14 DEDICATED INSTRUCTIONS
Sequence program
ABRST
instruction
Complete device
Complete state display
device
(2) An I/O module is used for communication (data read/write) with the servo amplifier
capable of processing the absolute positions.
When using the ABRST , prepare the input/output with the following number of
points, for each axis, for communication with the servo amplifier.
• Input :
3 points
• Output :
3 points
Refer to Section 12.6 for wiring of I/O signals.
(3) The ABRST
instruction completion can be confirmed using the complete devices
((D)+0) and ((D)+1).
(a) Complete device ((D)+0)
This device is turned ON by the END processing of the scan for which
ABRST
instruction is completed, and turned OFF by the next END
processing.
(b) Complete state display device ((D)+1)
This device is turned ON and OFF according to the state in which ABRST
instruction is completed.
• When completed normally
• When completed abnormally:This device is turned ON by the END
END
END
processing
processing
ON
OFF
OFF
OFF
The completion of absolute position restoration can be confirmed using the ((S)+4)
"status".
:Kept unchanged at OFF.
processing of the scan for which ABRST
instruction is completed, and turned OFF by
the next END processing. (same ON/OFF
operation as complete device).
ABRST
instruction
execution completion
14 - 5
MELSEC-Q
END
END
processing
processing
ON
When
completed
ON
abnormally
When
completed normally
1 scan
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Troubleshooting
