A PLC is a modular device which one can program using Ladder diagrams (relay logic) or Statement List (a bit like assembly). It is optimized to handle several digital inputs and outputs, and is more rugged for use in industrial applications. Basically it scans the inputs, and determines the outputs based on the logical conditions programmed into it by the user. It internally uses a microcontroller to handle all input, output and logic scans. Application area is mostly industrial automation.
plc is strongly responsible for the automation in the large scale industry ,without plc automation is very difficult ,we can say it is almost impossible .
ReplyDeletesince a program that take months to complete in machine/assembly language ,can be just completed in only 10min by using functional block diagram or ladder logic.