Siemens SIMATIC S7 System Manual page 509

Table 9- 16
Parameter
EN
Req
ConnID
LocPort
Done
Busy
Error
Status
Example
This is an example usage of the UDP_CONNECT instruction:
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Parameters of the UDP_CONNECT instruction
Declaration Data type
IN BOOL
IN BOOL
IN WORD
IN WORD
OUT BOOL
OUT BOOL
OUT BOOL
OUT BYTE
9.4 Open user communication library
Description
Enable input
The CPU starts the connect operation if Req =
TRUE. If Req = FALSE, then the outputs show
the current status of the connection.
The CPU uses the Connection ID (ConnID) num-
ber to identify this connection for the other in-
structions. The possible ConnID range is 0 to
65534.
The LocPort is the port number on the local de-
vice. The local port number range is 1 to 49151
with some restrictions. Refer to the LocPort defi-
nition in "Parameters common to the OUC library
instructions" (Page 499).
The instruction sets the Done output when the
connect operation is complete with no errors.
The instruction sets the Busy output while the
connection operation is in progress.
The instruction sets the Error output when the
connection operation is complete with an error.
Refer to "Open user communication library in-
struction error codes" (Page 524) for further in-
formation.
The Status output shows the error code if the
instruction sets the Error output. Status is zero
(no error) if the instruction sets the Busy or Done
outputs.
Libraries
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