Mitsubishi QJ71GP21-SX, Reference Manual

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9
DEDICATED INSTRUCTIONS
9.3 JP/GP. READ
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(c) Checking the execution status of the READ instruction
The execution status of the READ 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 READ
instruction, and turns OFF in the next END processing.
2) Completion status indication device ((D2)+1)
Turns ON or OFF depending on the completion status of the READ instruction.
• When completed normally
It remains OFF.
• When failed
It turns ON in the END processing for the scan after completion of the
READ instruction, and turns OFF in the next END processing.
(d) Operation in READ instruction execution
Figure 9.11 Operation in READ instruction execution (own station)
Program of own station
Completion device of
own station (D2)
Completion status indication
device ((D2)+1)
READ instruction
READ instruction execution Reading from the device specified
by READ completed
Start contact
OFF
ON
ON
ON
END processing END processing END processing END processing
OFF
OFF
When failed
Normal completion
1 scan