Siemens SIMATIC S7 System Manual page 405

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The "ad hoc mode" exists with the TCP and ISO on TCP protocol variants. You set "ad hoc

mode" by assigning "65535" to the LEN parameter. The receive area is identical to the area

formed by DATA. The length of the received data will be output to the parameter

If you store the data in an "optimized" DB (symbolic only), you can receive data only in

arrays of Byte, Char, USInt, and SInt data types.

Importing of S7-300/400 STEP 7 projects containing "ad hoc mode" into the S7-1200

In S7-300/400 STEP 7 projects, "ad hoc mode" is selected by assigning "0" to the LEN

parameter. In the S7-1200, you set "ad hoc mode" by assigning "65535" to the LEN

If you import an S7-300/400 STEP 7 project containing "ad hoc mode" into the S7-1200, you

must change the LEN parameter to "65535".

Due to the asynchronous processing of TSEND_C, you must keep the data in the sender

area consistent until the DONE parameter or the ERROR parameter assumes the value

For TSEND_C, a TRUE state at the parameter DONE means that the data was sent

successfully. It does not mean that the connection partner CPU actually read the receive

Due to the asynchronous processing of TRCV_C, the data in the receiver area are only

consistent when parameter DONE = 1.

TSEND_C and TRCV_C instructions BUSY, DONE, and ERROR parameters

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

The job is being processed.

The job is successfully completed.

The job was ended with an error. The cause of the error can be found

in the STATUS parameter.

A new job was not assigned.

103BCommunication

10.2 PROFINET

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Simatic s7-1200