Mitsubishi Electric MELSEC Q Series Reference Manual page 486

(3) Function
(a) RIRD instruction overview
This instruction allows access to the CPU module device specified in (S)+2 and (S)+3 of the station specified in
(S)+1.
The read data are stored in the receive buffer of the CC-Link IE Controller Network module.
The read data are stored in and after the device specified in (D1), and the device specified in (D2) is set to on.
[Own station]
CPU module
(D1)
(b) Checking the execution status of the RIRD instruction
The execution status of the RIRD 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 RIRD instruction, and turns 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 RIRD instruction, and turns OFF in
the next END processing, only when the RIRD instruction has failed.
(c) Operation in RIRD instruction execution
• Operation of the own station
Program of own
station
RIRD instruction
Start contact
Completion device
of own station (D2)
Completion status
indication device
((D2)+1)
484
CC-Link IE Controller
Network module
RIRD
Receive
buffer
END END
processing processing
RIRD instruction
execution
ON
OFF
OFF
OFF
[Target station]
CC-Link IE Controller
CPU module
(S)+2
(S)+3
END
processing
Reading from the device
specified by RIRD
completed
ON
ON When failed
Normal completion
1 scan
Network module
END
processing