I am using Modbus Ethernet to Modbus protocol converter of Modicon (174 cev 300 10). My four PLCs are multidropped on RS485 and connected to RS485 port of bridge. Modbus ethernet port is connected to PC having Fix32 as HMI. I am using MBE 7.16 driver which supports Unit_Id field. But at a time i can get data from only one PLC provided other is off. Does anybody this ?? How to get data from all four PLCs simultaniously using this bridge and fix32 as HMI ??