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MELSEC-Q
10 DEDICATED INSTRUCTIONS
(4) Whether an INPUT instruction was completed normally or abnormally can be
checked by the completion device ((D2)) or status display device at completion
((D2)+1).
(a) Completion device: Turns on at the END processing of the scan where the
INPUT instruction is completed, and turns off at the next
END processing.
(b) Status display device
at completion
: Turns on and off depending on the completion status
of the INPUT instruction.
• Normal completion : Off with no change.
• Abnormal completion: Turns on at the END
processing of the scan where
the INPUT instruction is
completed, and turns off at
the next END processing.
[Operation during execution of an INPUT instruction]
Sequence
program
Completion device
Status display device
at completion
END
processing
END
processing
Abnormal
completion
Normal
completion
One scan
END
processing
END
processing
Reception data
read request (X3)
Reception abnormal
detection (X4)
INPUT
instruction
ON
ON
OFF
OFF
Error
(1) When a dedicated instruction is completed abnormally, the abnormal completion
signal (D2)+1, turns on and the error code is stored in the reception result (S)+1.
In case of operation errors, the error flag (SM0) turns on and the error code is
stored in SD0.
See one of the following manuals according to the error code, and check and
correct the error.
<Error code>
4FFF
H or less : QCPU User's Manual
(Hardware Design, Maintenance and Inspection)
7000
H or more: Section 11.2
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