Active Partner (Client) - Siemens SIMATIC S7 System Manual

Libraries
9.4 Open user communication library
9.4.4.1

Active partner (client)

This program implements a simple state machine to manage the creating of a connection,
cyclically sending/receiving a message, and handling errors.
The flow of this state machine is to connect, then repeatedly send and receive a message. If
the connection is dropped, the state machine tries to reconnect.
Refer to the "Active partner symbol table" (Page 536) to see the symbol table for this
program.
Network 1: On the first scan....
Initialize the State variable to initiate a connection. Clear the good and bad receive counts,
and initialize some data to send.
Network 2: Process the state machine...
Determine the current state of the state machine and jump to the label for the state handler.
If the state is ever illegal, the CPU goes to the STOP mode.
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System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART