From the course: Introduction to PLC and Industrial Automation
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Input instructions - Ladder Logic Tutorial
From the course: Introduction to PLC and Industrial Automation
Input instructions
- [Instructor] An input instruction is written on the left-hand side of the ladder logic. The way we write input symbol as two bars facing each other, and to differentiate between the physical input device and the input within the software, we refer to the input in the PLC program as an input instruction. There are two main types of input instructions. Examine If Closed, or XIC, Examine If Open, or XIO. In the ladder program, the instruction is highlighted when its logic state is true. The two input instructions, XIC, Examine If Closed, and XIO, Examine If Open are Boolean type, which means either on or off, zero or one. Here's an example. Once that the physical switch is on, you see in the software that the input instruction is activated. If we have multiple inputs, let's say we have two switches, there are two ways of adding them using And format or Or format. Using And. If you have multiple inputs, and you…
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