The parameters of the touch screen should be set incorrectly, and the PLC program does not need to be moved. See if the system parameters in the touch screen configuration software are set correctly, including communication protocol, interface type, port number, etc. If the PLC program is not debugged by itself, it is best to confirm this information with the other party.

If the touch screen has been used normally after replacement, it is sudden, and it is necessary to check whether the communication between the touch screen and PLC is normal.