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Communications
6.1 PROFINET instructions (T-blocks)
The CPU uses the Transport Connection Protocol (TCP) and the ISO Transport over TCP
(RFC 1006) application protocols. When configuring a connection with a CPU for ISO-over-
TCP, use only ASCII characters in the TSAP extension for the passive communication
partners.
There are two ways to communicate using PROFINET:
● Direct connection: Use direct communication when you are using a programming device,
● Network connection: Use network communications when you are connecting more than
An Ethernet switch is not required for a direct connection between a programming device or
HMI and a CPU. An Ethernet switch is required for a network with more than two CPUs or
HMI devices.
Note
The PROFINET port on the CPU does not contain an Ethernet switching device. You can
use a rack-mounted Siemens CSM1277 4-port Ethernet switch to connect your CPUs and
HMI devices.
6.1
PROFINET instructions (T-blocks)
Use the T-block instructions only in a program cycle OB (such as OB 1).
● To establish a connection, execute TSEND_C with CONT = 1. After successful
● To terminate the communication connection, execute TSEND_C with CONT = 0. The
● To send data over an established connection, execute TSEND_C with a rising edge on
● To establish a connection and send data, execute TSEND_C with CONT =1 and REQ =
74
HMI, or another CPU connected to a single CPU.
two devices (for example, CPUs, HMI panels, programming devices, and non-Siemens
devices).
establishing of the connection, set the DONE parameter for one cycle.
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.
REQ. After a successful send operation, TSEND_C sets the DONE parameter for one
cycle.
1. After a successful send operation, TSEND_C sets the DONE parameter for one cycle.
TSEND_C establishes a TCP or ISO on TCP communication
connection to a partner station, sends data, and can terminate
the connection. After the connection is set up and established,
it is automatically maintained and monitored by the CPU.
TSEND_C combines the functions of TCON, TDISCON and
TSEND.
Easy Book
Manual, 05/2009, A5E02486774-01
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