Mitsubishi QJ71C24N User Manual page 287

10 DEDICATED INSTRUCTIONS
Error
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(3) Whether an ONDEMAND instruction was completed normally or abnormally can
be checked by the completion device ((D)) or status display device at completion
((D)+1).
(a) Completion device
(b) Status display device
at completion
[Operation during execution of an ONDEMAND instruction]
Sequence
program
ONDEMAND
instruction
Completion device
Status display device
at completion
(1) When a dedicated instruction is completed abnormally, the abnormal completion
signal, (D)+1, turns on and the error code is stored in the transmission result
(S1)+1.
In case of operation errors, the error flag (SM0) turns on and the error code is
stored in the SD0.
See one of the following manuals according to the error code, and check and
correct the error.
<Error code>
4FFF or less : QCPU User's Manual
H
(Hardware Design, Maintenance and Inspection)
7000 or more: Section 11.2
H
: Turns on at the END processing of the scan where
the ONDEMAND instruction is completed, and turns
off at the next END processing.
: Turns on and off depending on the completion status
of the ONDEMAND instruction.
• Normal completion : Off with no change.
• Abnormal completion: Turns on at the END
END
END
processing
processing
Execution of ONDEMAND
instruction
OFF
OFF
MELSEC-Q
processing of the scan where
the ONDEMAND instruction
is completed, and turns off at
the next END processing.
END END
processing processing
Completion of reading user frame
by ONDEMAND instruction
ON
Abnormal
completion
ON
Normal
completion
One scan
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