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(2) Function
(a) REQ instruction overview
The instruction sends request data (S2) to the target station for requesting service.
Specify the target stations in control data ((S1)+4 and (S1)+5).
When the request to the target station is completed, the completion device (D2) turns on.
(b) Target stations which can be specified
For details on target stations which can be specified, refer to the following.
Page 152, Section 10.1 (1)
(c) Checking the execution status of an REQ instruction
The execution status (completion or error) of the REQ 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 REQ 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 REQ instruction, and is turned off
in the next END processing only if the REQ instruction fails.
Clock data
read/write
Master/local moduleSafety CPU module CPU module
REQ
Network module
(S2)
Channel 1
Channel 2
[Own station] [Target station]