Legacy Modbus Tcp Examples; Example: Legacy Mb_Server Multiple Tcp Connections - Siemens SIMATIC S7-1200 System Manual

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Communication processor and Modbus TCP

13.8 Legacy Modbus TCP communication

Legacy Modbus TCP examples

You can have multiple Modbus TCP server connections. To accomplish this, MB_SERVER

must be independently executed for each connection. Each connection must use an

independent instance DB, connection ID, and IP port. The S7-1200 allows only one

connection per IP port.

For best performance, MB_SERVER should be executed every program cycle, for each

Network 1: Connection #1 with independent IP_PORT, connection ID, and instance DB

Network 2: Connection #2 with independent IP_PORT, connection ID, and instance DB

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK