Siemens S7-1200 - Page 524

Communication
10.2 PROFINET
S7-1200 Programmable controller
524 System Manual, 03/2014, A5E02486680-AG
Note
Ad hoc mode
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 recei
ved data will be output to the parameter
RCVD_LEN.
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.
Note
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
parameter.
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".
Note
Must keep the data in the sender area consistent until the DONE parameter or the ERROR
parameter assumes the value TRUE
Due to the asynchronous processing of TSEND_C, yo
u must keep the data in the sender
area consistent until the DONE parameter or the ERROR parameter assumes the value
TRUE.
For TSEND_C, a TRUE state at the parameter DONE means that the data was sent
successfully. It does not mean that the connection partn
er CPU actually read the receive
buffer.
Due to the asynchronous processing of TRCV_C, the data in the receiver area are only
consistent when parameter DONE = 1.
Table 10- 5 TSEND_C and TRCV_C instructions BUSY, DONE, and ERROR parameters
BUSY
DONE
ERROR
Description
TRUE
irrelevant
irrelevant
The job is being processed.
FALSE TRUE FALSE The job is successfully completed.
FALSE FALSE TRUE The job was ended with an error. The cause of the error can be found
in the STATUS parameter.
FALSE
FALSE
FALSE
A new job was not assigned.