While checking the project (drawing) file can help determine the exact issue, this problem is usually caused by the presence of an address on that specific screen that cannot communicate with the PLC, resulting in a communication error only on that screen.

 

Even a single invalid or non-communicable address on a screen can cause a communication error and halt operation.

 

Most software checks for address errors during the build process, but in some cases, incorrect addresses may remain in the project and be transferred. You need to correct the invalid address in the project file and resend it.

 

In TOP Design Studio (the software), use the [Tools] - [Address/Object Search] menu to search all PLC addresses on the relevant screen and check for any invalid addresses.

 

Run the [Address Validation] function from the menu screen to verify that all PLC addresses in the project file are valid and can actually communicate with the PLC.