Siemens SIMATIC S7 System Manual page 398

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103BCommunication

10.2 PROFINET

The following example shows the communication between two CPUs that utilize 1

connection for both sending and receiving the data.

● Each CPU uses a TCON instruction to configure the connection between the two CPUs.

● The TSEND instruction in CPU_1 links to the TRCV instruction in CPU_2 by using the

● The TSEND instruction in CPU_2 links to the TRCV instruction in CPU_1 by using the

connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_1.

The TRCV instruction in CPU_2 links to the TSEND instruction in CPU_1 by using the

connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_2.

The TRCV instruction in CPU_1 links to the TSEND instruction in CPU_2 by using the

connection ID ("connection ID 1") that was configured by the TCON instruction in CPU_1.

TCON on CPU_1 creates a

connection and assigns a connection

ID for that connection on CPU_1

TCON on CPU_2 creates a

connection and assigns a connection

ID for that connection on CPU_2

TSEND and TRCV on CPU_1 use the

connection ID created by the TCON

on CPU_1 (ID=1).

TSEND and TRCV on CPU_2 use the

connection ID created by the TCON

on CPU_2 (ID=1).

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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