Ladder logic is a graphical programming language widely used in the automation industry to program programmable logic controllers (PLCs) and control industrial automated processes. It is based on the electrical ladder diagrams used in control panels and is designed to be easily understood by electrical technicians and engineers who are familiar with relay logic.
In ladder logic, programs are represented as diagrams that resemble electrical ladder diagrams, with the rungs of the ladder representing individual instructions. The instructions in the ladder logic program control the flow of electrical current, just as in a physical control panel. The instructions can be used to control inputs and outputs, perform mathematical operations, and make decisions based on conditions.