Ladder logic is the most popular method of PLC programming because it has an easy to use graphics based interface and the programming language resembles an electrical schematic drawing. With the advent of microprocessors and the invention of the PLC, relay logic quickly became superseded by programming languages such as ladder logic. ![]() In the good ol’ days, machine and process automation was accomplished using a hard wired control system known as relay logic. Air and Liquid Flow and Pressure Control.Logistics Package Conveying and Sorting.Some industrial automation application examples where PLC ladder logic is used include…. It is used in a multitude of industrial automation applications. Ladder logic is a fast and simple way of creating logic expressions for a PLC in order to automate repetitive machine tasks and sequences. ![]() It is a graphical PLC programming language which expresses logic operations with symbolic notation using ladder diagrams, much like the rails and rungs of a traditional relay logic circuit. ![]() Ladder logic is a programming language that is used to program a PLC (Programmable Logic Controller).
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