Siemens SIMATIC S7 System Manual page 413

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Parameter and type

The TSEND 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.

TRCV Operations

The TRCV instruction writes the received data to a receive area that is specified by the

following two variables:

● Pointer to the start of the area

● Length of the area

As soon as all the job data has been received, TRCV transfers it to the receive area and sets

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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

0: Job not yet started or still running.

1: Job executed without error.

NDR = 0: Job not yet started or still running.

NDR = 1: Job successfully completed.

BUSY = 1: The job is not yet complete. A new job cannot be

BUSY = 0: Job is complete.

ERROR = 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 condition codes in the table below.)

TRCV: Amount of data actually received in bytes

103BCommunication

10.2 PROFINET

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Simatic s7-1200