Implementation of Basic Gates and Compound Gates (AOI & OAI) using Ladder Diagram in Programmable Logic Controller (PLC)

Programmable Logic Controllers or PLC, normally a digitized controller is fixed, rigid and industrial digital computer. Earlier days in industry, electromechanical relays, timers, counters and sequencers were widely used. The drawback of using these are many with respect to cost, wiring, and maintenance is more. The advancement in PLC came up to overcome all these factors. The question why PLC is the tool, which gives the control and hold in automation, it provides high gain, improved quality and accuracy, works flexible in criticized and hazardous situation, increase product rate, early time to market, low cost, and mainly since the automation helps in designing and changing over easily from one product to another. In this work, we have designed and simulated the basic gates and compound gates using ladder diagram in PLC, using Indraworks, Indralogic platform. This paper forms a basic for designing complex sequential circuits and helps in developing VLSI circuits. This paper gives a overview of AOI(And OR Inverter) and OAI(Or And Inverter) circuits designed and simulated through PLC with the help of ladder diagram.