Communication With A Programming Device - Siemens SIMATIC S7 System Manual

PROFINET

7.2 Communication with a programming device

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. The rack-mounted Siemens CSM1277 4-port Ethernet switch can be used to
connect your CPUs and HMI devices. The PROFINET port on the S7-1200 CPU does not
contain an Ethernet switching device.
Maximum number of connections for the PROFINET port
The PROFINET port on the CPU supports the following simultaneous communication
connections.
● 3 connections for HMI to CPU communication
● 1 connection for programming device (PG) to CPU communication
● 8 connections for S7-1200 program communication using the T-block instructions
● 3 connections for a passive S7-1200 CPU communicating with an active S7 CPU
Restricted TSAPs or port numbers for passive ISO and TCP communication
If you use the "TCON" instruction to set up and establish a passive communications
connection, the following port addresses are restricted and should not be used:
● ISO TSAP (passive): 01.00, 01.01, 02.00, 02.01, 03.00, 03.01
● TCP port (passive): 5001, 102, 123, 20, 21, 25, 34962, 34963, 34964, 80
7.2 Communication with a programming device
A CPU can communicate with a STEP 7 Basic programming device on a network.
210
(TSEND_C, TRCV_C, TCON, TDISCON, TSEN, TRCV)
– The active S7 CPU uses GET and PUT instructions (S7-300 and S7-400) or
ETHx_XFER instructions (S7-200).
– An active S7-1200 communication connection is only possible with the T-block
instructions.
Consider the following when setting up
communications between a CPU and a
programming device:
 Configuration/Setup: Hardware
configuration is required.
 No Ethernet switch is required for one-to-
one communications; an Ethernet switch
is required for more than two devices in a
network.
S7-1200 Programmable controller
System Manual, 11/2009, A5E02486680-02