Mitsubishi MELSEC LJ71C24, Руководство пользователя

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12 DEDICATED INSTRUCTIONS
(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 : Turns on at the END processing of the scan where
the ONDEMAND 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 ONDEMAND instruction.
• Normal completion : Remains OFF.
• Abnormal completion: Turns on at the END
processing of the scan where
the ONDEMAND instruction
is completed, and turns off at
the next END processing.
[Operation during execution of an ONDEMAND instruction]
Sequence
program
ONDEMAND
instruction
Completion device
Status display device
at completion
END
processing
END
processing
Execution of ONDEMAND
instruction
Completion of reading user frame
by ONDEMAND instruction
ON
ON
Abnormal
completion
Normal
completion
One scan
OFF
OFF
END
processing END
processing
Error
(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
H
or less: MELSEC-L CPU Module User's Manual (Hardware Design,
Maintenance and Inspection)
7000
H
or later: Section 15.2