I write seeking support about a problem I have with operator panel ABB CP430T-ETH, which communicates with a MicroSystem controller SCADAPack 334. These two are communicating via Modbus TCP / IP. The problem we have is that when we write in a holding register, this value is 0. We can read perfectly without any problems, but when you enter a value of 0. This problem does not occur with Siemens TP177B screen, so I think it is problem of the screen. It is in our interest to install an ABB operator panel, so I come to you with this concern.
Need more information here; are you getting any problem with writing value from CP430T via Modbus TCP/IP using holding register? In my opinion it cannot be a screen problem but maybe some Modbus configuration or addressing issue. In case you are doing multichannel communication from CP430T check in attached file for read/write address setup..
Hope it helps to you….