Mitsubishi Electric MELSEC Q Series Reference Manual page 349

(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 SREAD instruction is executable only when the target station is QCPU, RCPU, LCPU, or QnACPU.
The SREAD instruction is not executable to the ACPU connected to MELSECNET/10 or Ethernet.
(c) Checking the execution status of the SREAD instruction
The execution status of the SREAD 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 SREAD 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 SREAD instruction, and turns OFF in
the next END processing, only when the SREAD instruction has failed.
(d) Operation in SREAD instruction execution
• Operation of the own station
END processing END processing
Program of own station
SREAD instruction
OFF
Start contact
OFF
Completion device of
own station (D2)
Completion status indication
OFF
device ((D2)+1)
• Operation of the target station
END processing
Program of target station
OFF
Read notification device (D3)
SREAD instruction execution
ON
END processing
Reading of the device specified
by SREAD completed
CHAPTER 9 DEDICATED INSTRUCTIONS
END processing END processing
Reading from the device specified
by SREAD completed
ON
ON When failed
Normal completion
1 scan
END processing END processing
ON
1 scan
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