PLC Rack slot numbers

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When PLC rack is inserted in PLC manager, slots startwith number 1 If I use Allen-Bradley PLSs, the module numbers start with 0

Rack 0: Slot 1: Power supply only or empty Slot 2: CPU only Slot 3: Interface module 6ES7400-1JA21-0AA0 Siemens SIMATIC CVS400A-UR9, rack Alu UR9, distributed, with 9 slots available on

betflag slot Each slot in the rack is capable of accommodating any type of IO module The IO system provides an interface between the hard- wired components in the field • ControlEdge PLC Racks • ControlEdge PLC Expansion Processor Module 4 IO Slot Rack – Non-Redundant Power 3 900R08-0200 8 IO Slot