The PLC will scan the login from top to bottom, left to right and execute each rung. examine if closed (XIC) or examine if open (XIO) on the left, and various outputs on the right. Ladder logic is defined by multiple rungs of circuits with inputs e.g. In this article I will be demonstrating several basic circuits drawn in ladder logic. There are several paradigms for PLC programming - ladder logic, functional block diagram, and structured text. You can read more about PLCs in my article on ICS Level 1 devices in the link below. It has a Central Processing Unit (CPU) where the application engineer can download a program, which accepts various inputs and triggers various outputs to do a task. A Program Logic Controller (PLC) is a device used in industrial control systems (ICS) to carry out automation functions such as operating a pump, opening a valve etc.
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