9
DEDICATED INSTRUCTIONS
9.4 JP/GP.SREAD
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(c) Checking the execution status of the SREAD instruction
The execution status of the SREAD 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 SREAD
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 SREAD
instruction.
• When completed normally
It remains OFF.
• When failed
It turns ON in the END processing for the scan after completion of the
SREAD instruction, and turns OFF in the next END processing.
(d) Operation in SREAD instruction execution
1) Operation of the own station
2) Operation of the target station
Figure 9.21 Operation in SREAD instruction execution (own station)
Figure 9.22 Operation in SREAD instruction execution (target station)
Program of own station
Completion device of
own station (D2)
Completion status indication
device ((D2)+1)
SREAD instruction
SREAD instruction execution
Reading from the device specified
by SREAD completed
Start contact
OFF
ON
ON
ON
END processing END processing
END processing
END processing
OFF
OFF
When failed
Normal completion
1 scan
Read notification device (D3)
Program of target station
Reading of the device specified
by SREAD completed
OFF
ON
END processing
END processing
END processing
END processing
1 scan
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