Open User Communication; Connection Ids For The Open User Communication Instructions - Siemens S7-1200 System Manual

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Communication

10.2 PROFINET

Open user communication

When you insert the TSEND_C, TRCV_C or TCON PROFINET instructions into your user

program, STEP 7 creates an instance DB to configure the communications channel (or

connection) between the devices. Use the "Properties" of the instruction to configure the

parameters for the connection. Among the parameters is the connection ID for that

● The connection ID must be unique for the CPU. Each connection that you create must

have a different DB and connection ID.

● Both the local CPU and the partner CPU can use the same connection ID number for the

same connection, but the connection ID numbers are not required to match. The

connection ID number is relevant only for the PROFINET instructions within the user

program of the individual CPU.

● You can use any number for the connection ID of the CPU. However, configuring the

connection IDs sequentially from "1" provides an easy method for tracking the number of

connections in use for a specific CPU.

Each TSEND_C, TRCV_C or TCON instruction in your user program creates a new

connection. It is important to use the correct connection ID for each connection.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG