Communication
11.2 PROFINET
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
849
When you use the instruction tree to place a TSEND_C or TRCV_C instruction in your
program, a new FB or FC instance, depending on the TSEND_C or TRCV_C instruction
selected, is created in the project tree. You can see new FB or FC instance in the project
tree under PLC_x > Program blocks > System blocks > Program resources.
To verify the version of a TSEND_C or TRCV_C instruction in a program, you must inspect
project tree properties and not the properties of a box displayed in the program editor. Select
a project tree TSEND_C or TRCV_C FB or FC instance, right-click, select "Properties", and
select the "Information" page to see the TSEND_C or TRCV_C instruction version number.
Legacy TSEND_C and TRCV_C (Send and receive data using Ethernet)
The legacy TSEND_C instruction combines the functions of the legacy TCON, TDISCON
and TSEND instructions. The TRCV_C instruction combines the functions of the TCON,
TDISCON, and TRCV instructions. (Refer to "Legacy TCON, TDISCON, TSEND, and TRCV
(TCP communication) instructions (Page 868)" 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 198).
Note
Initializing the communication parameters
After you insert the TSEND_C or TRCV_C instruction, use the "Properties"
of the instruction
807) to configure the communication parameters (Page 832). As you enter the
parameters for the communication partners in the inspector window, STEP
7 enters the
corresponding data in the DB f
or the instruction.
If you want to use a multi
-instance DB, you must manually configure the DB on both CPUs.
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