Mitsubishi MELSEC LJ71C24, User Manual

Page: 232 / 428

12 - 17 12 - 17
12 DEDICATED INSTRUCTIONS
(3) Whether an OUTPUT 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
OUTPUT 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 OUTPUT instruction.
• Normal completion : Off with no change.
• Abnormal completion: Turns on at the END
processing of the scan where
the OUTPUT
instruction is
completed, and turns off at
the next END processing.
[Operation during execution of an OUTPUT instruction]
OUTPUT instruction
Execution of OUTPUT
instruction
Completion of transmission by
the OUTPUT instruction
ON
ON
OFF
OFF
END
processing END
processing END
processing END
processing
Sequence
program
Completion device
Status display device
at completion
Abnormal
completion
Normal
completion
One scan
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 the following 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