Mitsubishi Electric MELSEC Q Series Reference Manual page 381

(3) Function
(a) REQ instruction overview
The REQ instruction sends request data (S2) to the target station to request for service.
The target station is specified in Target station network No. ((S1+4) and Target station No. ((S1+5) of control
data.
Upon completion of the request to the target station, the completion device (D2) turns ON.
[Own station]
CPU module
(S2)
REQ
(b) Target stations available for specification
• Target network
In addition to CC-Link IE Controller Network, stations in the following networks can be also specified.
• CC-Link IE Field Network
• MELSECNET/H
• MELSECNET/10
• Ethernet
• Target station's CPU type
The REQ instruction is executable only when the target station is QCPU, RCPU, LCPU, or QnACPU.
The REQ instruction is not executable to the ACPU connected to MELSECNET/10 or Ethernet.
(c) Checking the execution status of the REQ instruction
The execution status of the REQ 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 REQ 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 REQ instruction, and turns OFF in the
next END processing, only when the REQ instruction has failed.
[Target station]
CC-Link IE Controller
Network module
CPU module
Channel 1
Channel n
RUN/STOP
Channel 8
CHAPTER 9 DEDICATED INSTRUCTIONS
Network
module
9
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