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(2) Function
(a) REQ instruction overview
The instruction sends request data (S2) to the target station to request 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.
[Own station]
CPU module
(S2)
(b) Target stations that can be specified
For details on target stations which can be specified, refer to the following.
Page 236, 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 devices
specified in the setting data.
• Completion device (D2)
This device turns on in the END process of the scan where the REQ instruction is completed and turns off
in the next END process.
• Completion status indication device ((D2)+1)
If the REQ instruction fails, this device turns on in the END process of the scan where the REQ instruction
is completed and turns off in the next END process.
324
Master/local module
Channel 1
REQ
Channel 2
[Target station]
CPU module
Network module
Clock data
read/write
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