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Hi all, My Task: To control write to registers to my MSI430 safety PLC from Leuze Electronic using a HMI as a master. Protocol: Modbus TCP MSI430 (Modbus TCP - server/slave) Generic HMI (Modbus TCP - client/master) I'm reading Okay from the Register address 401101-40110 But I'm not able to write to the MSI PLC to address 402101-402109 Please see the attached images for gateway description for the device. Please advice/guide on how this could be done. I have tried using MBPoll and it says Illegal Data Address. Kind Regards NarkO Please find the below link for the manual