Mitsubishi Melsec-L Series User Manual page 220

Error
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(3) Whether an ONDEMAND instruction was completed or failed 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 failed, 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, Error flag (SM0) turns on and the error code is stored
in SD0.
Refer to one of the following manuals according to the error code, and check and
correct the error.
<Error code>
4FFF or less: MELSEC-L CPU Module User's Manual (Hardware Design,
H
Maintenance and Inspection)
7000 or later: Section 15.2
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
• Abnormal completion: Turns on at the END
END
END
processing processing
Execution of ONDEMAND
instruction
OFF
OFF
12 DEDICATED INSTRUCTIONS
: Remains OFF.
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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