tahir4awan
Member
It is said that slot 0 is PLC itself in a rack. But I don't see any I/O slot in a modular PLC. Then why do we use slot 0 address?
Slot 0 of Allen Bradley PLC
- Thread starter tahir4awan
- Start date
sthompson
Lifetime Supporting Member + Moderator
Normally Slot 0 is the left most Slot, but it again depends on the manufacturer of the PLC. This is normally where the PLC Processor, or the Communications Adapter would go.
The new PAC Controllers can be in any position, and in many cases there can be multiple Controllers in one chassis. The Backplane is just a Communications Bus. Although, the Processor usually goes into Slot 0 by convention.
For example the Allen Bradley ControlLogix PLCs.
Stu.....
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