Number Of Asynchronous Communication Connections; Profinet And Profibus Instructions - Siemens SIMATIC S7-1200 Manual
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Easy to communicate between devices
7.3 Number of asynchronous communication connections
7.3
Number of asynchronous communication connections
The CPU supports the following maximum number of simultaneous, asynchronous
communication connections for PROFINET and PROFIBUS:
● 8 connections for Open User Communications (active or passive): TSEND_C, TRCV_C,
● 3 CPU-to-CPU S7 connections for server GET/PUT data
● 8 CPU-to-CPU S7 connections for client GET/PUT data
Note
S7-1200, S7-300, and S7-400 CPUs use the GET and PUT instructions for CPU-to-CPU
S7 communication. An S7-200 CPU uses ETHx_XFER instructions for CPU-to-CPU
S7 communication.
● HMI connections: The CPU provides dedicated HMI connections to support up to 3 HMI
● PG connections: The CPU provides connections to support 1 programming device (PG).
● Webserver (HTTP) connections: The CPU provides connections for the Webserver.
7.4
PROFINET and PROFIBUS instructions
PROFINET instructions
The TSEND_C and TRCV_C instructions make PROFINET communications simpler by
combining the functionality of the TCON and TDISCON instructions with the TSEND or
TRCV instruction.
● TSEND_C establishes a TCP or ISO on TCP communication connection to a partner
● TRCV_C establishes a TCP or ISO-on-TCP communication connection to a partner CPU,
The TCON, TDISCON, TSEND and TRCV instructions are also supported.
Use the TUSEND and the TURCV instructions to transmit or receive data via UDP. TUSEND
and TURCV function asynchronously, which means that the processing of the job extends
over several instruction calls.
126
TCON, TDISCON, TSEND, and TRCV.
devices. (You can have up to 2 SIMATIC Comfort panels.) The total number of HMI is
affected by the types of HMI panels in your configuration. For example, you could have
up to three SIMATIC Basic panels connected to your CPU, or you could have up to two
SIMATIC Comfort panels with one additional Basic panel.
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 the TCON, TDISCON and TSEND instructions into one
instruction.
receives data, and can terminate the connection. After the connection is set up and
established, it is automatically maintained and monitored by the CPU. The TRCV_C
instruction combines the functions of the TCON, TDISCON, and TRCV instructions into
one instruction.
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Manual, 11/2011, A5E02486774-04
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