Mitsubishi Electric MELSEC Q Series Reference Manual page 464

(c) Checking the execution status of the RTMRD instruction
The execution status of the RTMRD instruction (Normal completion, Error completion) can be checked with the
following devices specified in the setting data.
• Completion device (D2)
Turns ON in the END processing for the scan after completion of the RTMRD instruction, and goes OFF in
the next END processing.
• Completion status indication device ((D2)+1)
Turns ON in the END processing for the scan after completion of the RTMRD instruction, and turns OFF in
the next END processing, only when the RTMRD instruction has failed.
(d) Operation in RTMRD instruction execution
• Operation of the own station
Program of
own station
RTMRD instruction
Start contact
Completion device
of own station (D2)
Completion status
indication device
((D2)+1)
462
END END
processing processing
RTMRD instruction execution
ON
OFF
OFF
OFF
END END
processing processing
RTMRD instruction
execution completed
ON
ON When failed
Normal completion
1 scan