Why the HMI can not be communicated with PLC, inverter and the screen shows “communicating…”

Firstly, check that if the cable connects the HMI and device is damaged or disconnect. If this cable is made by yourself, please make sure that the wiring is correct.

Secondly, check that if the communication parameters setting are correct, e.g.: Station No., Baud rate, Stop bit, Data bit, Parity check.

If the above have been set correctly, you can check the contents of your project, especially the buttons, data input and other components related to the communication devices. E.g.: Use a RT communicates with PLC by cables and set PLC station No. as 1, and then add a button with M0 to set on. Thus, you should set Station No. as “1” and choose “PLC port” in Device box.