Omron 3G8F7-CRM21, User Manual

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Explicit Messaging Section 4-3
4-3 Explicit Messaging
4-3-1 Explicit Messaging
This is the procedure by which to use periodic polling from the user
application, execute explicit messaging, and confirm the response.
Precautions for Correct Use
Explicit messaging may require some time to get a response. Therefore it
must be operated in any timing where no I/O process is required or in threads
other than for I/O process.
YES
NO
An Explicit message request?
YES
NO
Loop Start
(Open Board)
CPNT_Open
(Send Explicit Message)
CPNT_SendExplicit
End processing
Loop End
(Stop Communications cycles)
CPNT_StopCycle
(Close Board)
CPNT_Close
Initial processing
(Start Communications cycles)
CPNT_StartCycle
I/O process and so on
Message process
(Check Response Received)
CPNT_PeekExplicit
A response?
(Read Explicit Response Message)
CPNT_ReceiveExplicit
Insert Time-out
process if
necessary.