'plc'

manjunatha from bangalore (Contact Member) -

what is difference between plc and cnc

Comment #1 Nilo from Ohio (Contact Member) -

A PLC (Programmable Logic Controller) is a system consisting of a processor and I/O cards (Input/Output) that control the connected equipment. I.E. relays, switches, soloniods, Motor control centers and so on, using Ladder Logic. A CNC machine uses computer instructions that control the liniar movement of some sort of paticular tooling device, usually on 3 to 5 axis (Mills. Lathes, Engravers and even robotics in their earliest forms.) A CNC is usually limited to outputting a direction, speed, and pulse count (lenght) to a stepper type motor. The PLC, through the ladder logic control, turns on or off outputs based on decisions dirived from the inputs it recieves from the inputs and ladder instructions. You can use a PLC to control stepper motors but it would not be very cost effective and require special input and output cards as well as special programing. This would be like adapting the space shuttle to cut your lawn. (A little over the top but you get my drift.)

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