text: <s>[INST] Powerflex 400, modbus 485 communication error, when connecting 22-HIM-C2S with splitter I have a problem trying to connect an External 22-HIM-C2S panel to a PowerFlex 400. The Drive is connected to a Compact Logix L35E through a DSI / Modbus RTU module. When connecting the modbus cable and the external HIM with the splitter, the Modbus communication is cut Off. The Compact Logix shows me a Modbus communication error, only disconnecting the external HIM is that the communication with the Drive -PLC returns and the error message is removed. I would like to know your support if it is possible to keep the External panel and the modbus communication working together permanently. Since the original PowerFLex panel was damaged and as a result of this situation we need to install the External panel. In case the Modbus communication and the panel connected to the splitter cannot work at the same time, can you help me to know if it is possible to refact the PowerFlex 400 screen? Or what other configuration can we use to install the 22-HIM -C2S? [/INST] Hi EMBARCADERO and welcome to Engage ! Unfortunately that kind of communication isn't supported due to protocol incompatibility between the two sources you would like to use. It is also explained inside the following technote: QA30804 Please consider that a TechConnect contract is required to access the technote. About the broken onboard HMI, I guess you should send the entire drive for repair. There is a technote that can help if you want to consider replacing the Main Control Board in the field (only for specific frames) Here is the link: QA23669 Hope this helps, fuzzy logic Please don't forget to use the LIKE button and highlight the decisive answer : REPLY > Make Best Answer \\n </s>