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Can I connect 2 masters device with Twido PLC CPU TWDLMDA20DRT on RS485 Port at same time on Modbus protocol.

Yes, you can use this Twido PLC for communicating two devices on RS485 communication (configuring them as Master device) , but one thing you need to make note that the distacnce between these two device from the Twido PLC should not be more than 10 metres and in case if it is more than 10 meters then use isolator in between them. 
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