1. Open WinCC software and create a new project.

2. When building a new project, select SIMATIC S7-1200/S7-1500 (Modbus TCP) as the communication driver, and set parameters such as PLCCPU model.

3. Add a tab in WinCC to display the data from the lower computer.

4. Configure the lower computer connection information. In WinCC, connection information (IP address, port number, etc. ) Configure by adding remote devices, and set parameters and rules related to data reading and writing.

5, MODBUSTCP communication In WinCC, you can use the built-in MODBUSTCP communication protocol to read and write data. Parameters such as data type, register address and read-write command need to be set according to MODBUSTCP protocol format to realize data communication with the lower computer.