Siemens SIMATIC S7 System Manual page 397

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The following example shows the communication between two CPUs that utilize 2 separate

connections for sending and receiving the data.

● The TSEND_C instruction in CPU_1 links to the TRCV_V in CPU_2 over the first

● The TRCV_C instruction in CPU_1 links to the TSEND_C in CPU_2 over the second

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

connection ("connection ID 1" on both CPU_1 and CPU_2).

connection ("connection ID 2" on both CPU_1 and CPU_2).

103BCommunication

TSEND_C on CPU_1 creates a

connection and assigns a connection

ID to that connection (connection ID 1

TRCV_C on CPU_2 creates the

connection for CPU_2 and assigns the

connection ID (connection ID 1 for

TRCV_C on CPU_1 creates a second

connection for CPU_1 and assigns a

different connection ID for that

connection (connection ID 2 for

TSEND_C on CPU_2 creates a

second connection and assigns a

different connection ID for that

connection (connection ID 2 for

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Simatic s7-1200