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Communication between two PLCs: GE Fanuc (master) & Allen-Bradley (slave) using Modbus RTU protocol. In this we will be controlling I/Os connected to AB by writing Ladder in GE Fanuc. But we don't know how to make settings in slave so that it can work with different manufactureer's PLC, i.e. GE Fanuc. We communicated between GE Fanuc PLCs-Series 90-3- & Versamax using COMMREQ command in Machine Edition software. I want help regarding this...