Protocols - Siemens S7-1200 System Manual

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

instruction.

Protocols

The integrated PROFINET port of the CPU supports multiple communications standards

over an Ethernet network:

● Transport Control Protocol (TCP)

● ISO on TCP (RFC 1006)

● User Datagram Protocol (UDP)

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

TSEND_C on CPU_1 creates a

connection and assigns a connection

ID to that connection (ID=1).

TRCV_C on CPU_2 creates a

connection 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

10.2 PROFINET