Mitsubishi Electric MELSEC Q Series Reference Manual page 432

(d) Operation in ZNRD instruction execution
• Operation of the own station
Program of own station
ZNRD instruction
Start contact
Completion device of
own station (D2)
Completion status
indication device ((D2)+1)
(e) ZNRD instruction execution timing
With J.ZNRD, processing is executed one after another while the start contact is ON.
With JP.ZNRD, processing is performed one time only when the start contact turns ON from OFF.
• When completed normally
Sequence scan
Start contact
Completion device
Own station CPU
(Device specified in (D2))
Completion status indication
device (Device of (D2)+1)
Read data storage device
(Device specified in (D1))
CC-Link IE Controller
Network module
Network module
Sequence scan
Target station CPU
Read data storage device
(Device specified in (S1))
430
END END
processing processing
ZNRD instruction execution
ON
OFF
OFF
OFF
ZNRD
0 END 0
OFF
Channel 1 (Fixed)
0 END 0
END
processing
Reading from device specified in
ZNRD instruction completed
ON
ON When failed
Normal completion
1 scan
END 0 END
END 0 END 0 END
100
END
processing
0 END 0 END
1 scan
100
0 END