Siemens S7-1200 System Manual page 523

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Table of Contents

TSEND_C operations

The following functions describe the operation of the TSEND_C instruction:

● To establish a connection, execute TSEND_C with CONT = 1.

● After successful establishing of the connection, TSEND_C sets the DONE parameter for

● To terminate the communication connection, execute TSEND_C with CONT = 0. The

● To send data over an established connection, execute TSEND_C with a rising edge on

● To establish a connection and send data, execute TSEND_C with CONT =1 and REQ =

TRCV_C operations

The following functions describe the operation of the TRCV_C instruction:

● To establish a connection, execute TRCV_C with parameter CONT = 1.

● To receive data, execute TRCV_C with parameter EN_R = 1. TRCV_C receives the data

● To terminate the connection, execute TRCV_C with parameter CONT = 0. The

TRCV_C handles the same receive modes as the TRCV instruction. The following table

shows how data is entered in the receive area:

Entering the data into the receive area

Entering the data   i n the

receive area

Data reception with

specified length

Protocol-controlled

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

connection will be aborted immediately. This also affects the receiving station. The

connection will be closed there and data inside the receive buffer could be lost.

REQ. After a successful send operation, TSEND_C sets the DONE parameter for one

1. After a successful send operation, TSEND_C sets the DONE parameter for one cycle.

continuously when parameters EN_R = 1 and CONT = 1.

connection will be aborted immediately, and data could be lost.

  " connection_type"

Value of the LEN parameter

0 (recommended) or 1 to

8192, except 65535

0 (recommended) or 1 to

8192, except 65535

Communication

10.2 PROFINET

Value of the RCVD_LEN

parameter (bytes)