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g.UDP reception processing example (Socket status monitoring type)
Ladder program flowchart
UDP reception processing start
Socket status read/verify
Are bits C and E both 1? | No |
(Opened state?) |
|
Yes |
|
Is bit A set to 1? | No |
(Reception text present.) |
|
Yes |
|
Execute a UDP receive request
(CMD = 0033H).
Hold the input of function block in the on state until the RECV instruction completes.
Instruction completion
Error result
The processing in this section can be performed at this stage or at the point the instruction terminates abnormally.
The specified UDP socket is in the closed state. (Open processing is required.)
The specified UDP socket has not received data.
Verify the status
Normal complete?
No
An error occurred in reception processing. The specified socket could not receive the data.
Handle the error according to the completion and socket status.
Yes
Terminate UDP reception processing