Siemens S7-1200 System Manual page 522

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Table of Contents

Communication

10.2 PROFINET

Parameter and type

The TSEND_C instruction requires a low-to-high transition at the REQ input parameter to

start a send job. The BUSY parameter is then set to 1 during processing. Completion of the

send job is indicated by either the DONE or ERROR parameters being set to 1 for one scan.

During this time, any low-to-high transition at the REQ input parameter is ignored.

The default setting of the LEN parameter (LEN = 0) uses the DATA parameter to determine

the length of the data being transmitted. Ensure that the DATA transmitted by the TSEND_C

instruction is the same size as the DATA parameter of the TRCV_C instruction.

Contains address and length of data to be sent (TSEND_C)

Contains start address and maximum length of received data

Allows restart of the instruction:

0: Irrelevant

1: Complete restart of the function block, existing connection

will be terminated.

0: Job is not yet started or still running.

1: Job completed without error.

0: Job is completed.

1: Job is not yet completed. A new job cannot be triggered.

Status parameters with the following values:

1: Error occurred during processing. STATUS provides

detailed information on the type of error.

Status information including error information. (Refer to the

"Error and Status Parameters" table below.)

Amount of data actually received, in bytes

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG