Siemens SIMATIC S7 System Manual page 420

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Communication

8.4 Ethernet

Using Transport Service Access Points (TSAPs), ISO-on-TCP protocol allows multiple

connections to a single IP address. TSAPs uniquely identify these communication end point

connections to an IP address.

The ISO-on-TCP protocol utilizes port 102 exclusively. You cannot set the port number for

this protocol; however, you can set the TSAP for the local and remote partner.

The TSAP rules are shown below:

● You always enter TSAPs as an S7-200 SMART string data type (a length byte followed

by the string characters).

● TSAPs must be at least 2 characters and no more than 16 ASCII characters in length.

● The local TSAP cannot start with string "SIMATIC-"

● The local TSAP must begin with the hexadecimal character "0xE0" if the TSAP is exactly

2 characters long. For example, the TSAP "$E0$01" is legal but the TSAP "$01$01" is not

legal. (The "$" character denotes that the following value is a hexadecimal character.)

System Manual, V2.3, 07/2017, A5E03822230-AF

S7-200 SMART

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Troubleshooting

Simatic s7-200 smart