Siemens S7-1200 - TSEND_C and TRCV_C (Send and Receive Data Via Ethernet) Instructions

Communication
10.2 PROFINET
S7-1200 Programmable controller
520 System Manual, 03/2014, A5E02486680-AG
10.2.2.5
TSEND_C and TRCV_C (Send and receive data via Ethernet) instructions
The TSEND_C instruction combines the functions of the TCON, TDISCON and TSEND
instructions. The TRCV_C instruction combines the functions of the TCON, TDISCON, and
TRCV instructions. (Refer to "TCON, TDISCON, TSEND, and TRCV (TCP communication)
instructions (Page 527)" for more information on these instructions.)
The minimum size of data that you can transmit (TSEND_C) or receive (TRCV_C) is one
byte; the maximum size is 8192 bytes. TSEND_C does not support the transmission of data
from Boolean locations, and TRCV_C will not receive data into Boolean locations. For
information on transferring data with these instructions, see the section on data consistency
(Page 178).
Note
Initializing the communication parameters
After you insert the TSEND_C or TRCV_C instruction, use the "Properties"
of the instruction
(Page
150) to configure the communication parameters (Page 153). As you enter the
parameters for the communication partners in the inspector window, STEP
7 enters the
corresponding data in the DB for the instruction.
If you want to use a multi
-instance DB, you must manually configure the DB on both CPUs.