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9.12 J(P).ZNRD
9
DEDICATED INSTRUCTIONS
(c) Checking the execution status of the ZNRD instruction
The execution status of the ZNRD instruction (Executing, Normal completion,
Error completion) can be checked with the following devices specified in the
setting data.
1) Completion device (D2)
Turns ON in the END processing for the scan after completion of the ZNRD
instruction, and goes OFF in the next END processing.
2) Completion status indication device ((D2)+1)
Turns ON or OFF depending on the completion status of the ZNRD instruction.
• When completed normally
It remains OFF.
• When failed
Turns ON in the END processing for the scan after completion of the
ZNRD instruction, and goes OFF in the next END processing.
(d) Operation in ZNRD instruction execution
Figure 9.93 Operation in ZNRD instruction execution (own station)
Program of own station
Completion device of
own station (D2)
Completion status
indication device ((D2)+1)
ZNRD instruction
ZNRD instruction execution
Reading from device specified in
ZNRD instruction completed
Start contact
OFF
ON
ON
ON
END
processing
END
processing
END
processing
END
processing
OFF
OFF
When failed
Normal completion
1 scan
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