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I need to run two separate Modbus networks on a TSX 3721 Micro PLC. I am planning to use the PCMCIA Modbus card to be a master to several downstream modbus devices. I am planning to use the built-in terminal port to connect to a building automation system as a slave device. My question is, would this work and could I use a Magelis or another brand of Operator interface somehow within these confines (could a magelis and a building automation system both be connected to the PLC as master, I don't know for sure).