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I am using Siemens S7 416 plc for turbine control G60 for generator protection, AVR for excitation, BN for machine monitoring. I have to make modbus communication with PLC, AVR, BN, G60. my question is that CP441 is for point to point communication or i can do multidrop connection taking only one CP 441 card or i have to take two card one Cp 441-1 and one CP 441-2 for communication. Please reply soon.