Siemens SIMATIC S7-1200 System Manual page 831

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As shown in the following example, you can also use individual TSEND and TRCV

instruction to communication over a connection created by a TSEND_C or TRCV_C

instruction. The TSEND and TRCV instructions do not themselves create a new connection,

so you must use the DB and connection ID that was created by a TSEND_C, TRCV_C or

TCON instruction.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

TSEND_C on CPU_1 creates a con-

nection and assigns a connection ID

to that connection (ID=1).

TRCV_C on CPU_2 creates a connec-

tion and assigns the connection ID to

that connection on CPU_2 (ID=1).

TSEND and TRCV on CPU_1 use the

connection ID created by the

TSEND_C on CPU_1 (ID=1).

TSEND and TRCV on CPU_2 use the

connection ID created by the TRCV_C

on CPU_2 (ID=1).

Communication

11.2 PROFINET