Function of Racks in PLC - Types of SIEMENS S7-400 PLC Racks

1746-A13 PLC ModuleRack by ALLEN BRADLEY plc rack and slot This rack lies just beside the master rack It provides slots for plugging IO modules Data are exchanged with the CPU through a local rack communication slot step rack number and the slot number when using expansion racks Word and Bit— The word and bit are used to identify the actual terminal connection in a

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