A plc ladder logic program consists of a number of rungs with each rung controlling an input12/4/2023 Each of these circuits is known as a rung. The complete ladder diagram can be thought of as being formed by individual circuits, each circuit having one output. All the logical wiring can be thought of as being inside the CPU (soft-wired as opposed to hardwired). The ladder circuit connections in the PLC are implemented via software instructions. Since this type of instruction set is composed of contact symbols, it is also referred to as contact symbology. It is easy to understand, and most plant or industrial electricians are accustomed to working with elementary relay diagrams. The most widely used languages for implementing ON/OFF control and sequencing are ladder diagrams. ![]() These functions are used either singly or in combinations to form instructions that will determine if a device is to be switched ON or OFF. The logic implemented in PLCs is based on the three basic logic functions (AND, OR, NOT).
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