Communication With A Programming Device; Establishing The Hardware Communications Connection - Siemens SIMATIC S7 System Manual

Restricted TSAPs and 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):
● TCP port (passive): 5001, 102, 123, 20, 21, 25, 34962, 34963, 34964, 80
● UDP port (passive): 161, 34962, 34963, 34964
10.2.3

Communication with a programming device

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
10.2.3.1

Establishing the hardware communications connection

The PROFINET interfaces establish the physical connections between a programming
device and a CPU. Since Auto-Cross-Over functionality is built into the CPU, either a
standard or crossover Ethernet cable can be used for the interface. An Ethernet switch is not
required to connect a programming device directly to a CPU.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
– 01.00, 01.01, 02.00, 02.01, 03.00, 03.01
– 10.00, 10.01, 11.00, 11.01, ... BF.00, BF.01
required for more than two devices in a network.
A CPU can communicate with a STEP 7
programming device on a network.
103BCommunication
10.2 PROFINET
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