Communication
10.2 PROFINET
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
523
The following functions describe the operation of the TSEND_C instruction:
● To establish a connection, execute TSEND_C with CONT = 1.
● After successful establishing of the connection, TSEND_C sets the DONE parameter for
one cycle.
● To terminate the communication connection, execute TSEND_C with CONT = 0. The
connection will be aborted immediately. This also affects the receiving station. The
connection will be closed there and data inside the receive buffer could be lost.
● To send data over an established connection, execute TSEND_C with a rising edge on
REQ. After a successful send operation, TSEND_C sets the DONE parameter for one
cycle.
● To establish a connection and send data, execute TSEND_C with CONT =1 and REQ =
1. After a successful send operation, TSEND_C sets the DONE parameter for one cycle.
The following functions describe the operation of the TRCV_C instruction:
● To establish a connection, execute TRCV_C with parameter CONT = 1.
● To receive data, execute TRCV_C with parameter EN_R = 1. TRCV_C receives the data
continuously when parameters EN_R = 1 and CONT = 1.
● To terminate the connection, execute TRCV_C with parameter CONT = 0. The
connection will be aborted immediately, and data could be lost.
TRCV_C handles the same receive modes as the TRCV instruction. The following table
shows how data is entered in the receive area:
Table 10- 4 Entering the data into the receive area
Entering the data in the
receive area
Parameter
"connection_type"
Value of the LEN parameter
Value of the RCVD_LEN
parameter (bytes)
TCP Data reception with
B#16#11 0 (recommended) or 1 to
1 to 8192
ISO on TCP Protocol-controlled B#16#12 0 (recommended) or 1 to
1 to 8192
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