Mitsubishi Electric MELSEC Q Series Reference Manual page 494

(3) Function
(a) RIWT instruction overview
Data to be written to the target station are stored in the send buffer of the CC-Link IE Controller Network
module.
The data specified in (S2) are written to the CPU module device specified in (S1)+2 and (S1)+3 of the station
specified in (S1)+1.
When a response informing of write completion is returned from the target station, the device specified in (D) is
set to on.
[Own station]
CPU module
(S2)
(b) Checking the execution status of the RIWT instruction
The execution status of the RIWT instruction (Normal completion, Error completion) can be checked with the
following devices specified in the setting data.
• Completion device (D)
Turns ON in the END processing for the scan after completion of the RIWT instruction, and turns OFF in
the next END processing.
• Completion status indication device ((D)+1)
Turns ON in the END processing for the scan after completion of the RIWT instruction, and turns OFF in
the next END processing, only when the RIWT instruction has failed.
492
CC-Link IE Controller
Network module
RIWT
Send buffer
[Target station]
CC-Link IE Controller
CPU module
(S1)+2
(S1)+3
Network module