Mitsubishi Electric MELSEC Q Series Reference Manual page 394

(d) Operation in REQ instruction execution
• Operation of the own station
Program of own station
REQ instruction
Start contact
Completion device of
own station (D2)
Completion status indication
device ((D2)+1)
(e) REQ instruction execution timing
With J.REQ or G.REQ, processing is executed one after another while the start contact is ON.
With JP.REQ or GP.REQ, processing is performed one time only when the start contact turns ON from OFF.
• When completed normally
Sequence scan
Start contact
Own station CPU
Completion device
(Device specified in (D2))
Completion status indication device
(Device of (D2)+1)
CC-Link IE Controller
Network module
Network module
Sequence scan
Target station CPU
392
END processing END processing
REQ instruction execution
ON
OFF
OFF
OFF
REQ
0 END
OFF
0 END
0 END
Channel 1
0 END 0 END
Clock data read/write
END processing END processing
REQ instruction execution
completed
ON
ON When failed
Normal
completion
1 scan
0 END 0 END 0
1 scan
0 END 0 END
END