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(c) Checking the execution status of the READ instruction
The execution status (completion or error) of the READ instruction can be checked using the following device
specified for the setting data.
• Completion device (D2)
It is turned on in the END processing of the scan after completion of the READ instruction, and is turned off
in the next END processing.
• Completion status indication device ((D2)+1)
It is turned on in the END processing of the scan after completion of the READ instruction, and is turned off
in the next END processing only if the READ instruction fails.
(d) READ instruction execution timing
• When completed
1 scan
100
100
READ
Sequence scan
Start contact
Own station CPU
Target station CPU
Master/local module
Network module
Completion device
(Device specified in (D2))
Completion status
indication device
(Device of (D2)+1)
Read data storage device
(Device specified in (D1))
Sequence scan
Read data storage device
(Device specified in (S2))
END0 END0
Channel 1
END0 END0 END0
END0 END0 END0 END0 END0
OFF
OFF OFF
OFF
ON
ON
OFF