6 F 3 B 0 3 6 2
e.TCP open processing example
Ladder program flowchart
TCP open processing start
Socket status read/verify
Are bits C and D both 0? | No |
(Closed state?) |
|
Yes |
|
Execute a TCP open request
(CMD = 0035H).
Active or passive open
Hold the input of function block in the on state until the SEND instruction completes.
Instruction completion
Verify the status
Did
the operationNo complete before being
Error result
The specified socket is already open (active or passive).
Connection could not be established within the time limit.
timed out?
Yes
Normal complete?
Yes
No
An error occurred during open processing and the connection could not be established.
Handle the error according to the completion and socket status.
Terminate TCP open processing
(Connection established)
⎯ 99 ⎯
