ppt on PLCveenita moreThis document provides an overview of programmable logic controllers (PLCs). It defines a PLC as a digital computer used for industrial control systems. The document outlines the history of PLCs, their major components including the processor, power supply, and I/O modules. It describes the operational sequence of a PLC including input scan, logic solve, and output scan. Programming methods like ladder logic and functional block diagrams are discussed. Examples are provided of ladder logic programs for starting and stopping a motor. Advantages of PLCs include reliability, flexibility, and cost effectiveness. The document concludes by listing some common industrial applications of PLCs.