Ladder logic also helps you easily trouble shoot your code because you can visually see the flow of logic from the LHS start rail, through the logic symbols and to the RHS end rail.Ĭompared to text based programming languages, ladder logic programming is a lot easier to use. When programming ladder logic in a PLC, the graphic, drag and drop nature of ladder diagrams helps you formulate code quickly and easily. Engineers, electricians and students find the transition from an electric circuit to ladder logic relatively easy. 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 With the advent of microprocessors and the invention of the PLC, relay logic quickly became superseded by programming languages such as ladder logic.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.
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