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g. UDP reception processing example (Socket status monitoring type)
Ladder program flowchart Error result
UDP reception processing start
Socket status read/verify
Are bits C and E both 1?
(Opened state?)
Yes
Is bit A set to 1?
(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
Verify the status
Normal complete?
Yes
Terminate UDP reception processing
The processing in this section can be
performed at this stage or at the point the
instruction terminates abnormally.
No
No
The specified UDP socket is in the closed
state. (Open processing is required.)
The specified UDP socket has not received
data.
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.