Disconnect Instruction - Siemens SIMATIC S7 System Manual

Libraries
9.4 Open user communication library
Example
This is an example usage of the UDP_RECV instruction:
9.4.2.8

DISCONNECT instruction

The DISCONNECT instruction terminates an existing communication connection. The
DISCONNECT instruction is used for all protocols.
LAD/FBD STL
DISCONNECT ConnID,
LocPort, Done, Busy, Er-
ror, Status
The DISCONNECT instruction initiates the connection termination when the program calls
the DISCONNECT instruction with the Req input set TRUE. The Req input is level-triggered.
It is recommended that you put a positive edge trigger on the Req input.
If the requested connection (ConnID) is currently busy connecting, disconnecting, or cannot
be found because the connection has been reused, the DISCONNECT instruction returns an
error.
The DISCONNECT instruction displays the Done or Error output status for at least one call
of the instruction after the disconnect operation is complete. The instruction may return the
status of the DISCONNECT instruction for the specified connection for subsequent calls until
the CPU reuses the connection for another connect operation.
522
Description
The DISCONNECT terminates an existing communication connec-
tion for all protocols.
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART