Outputs are the physical actions or visual results that are based on a PLC logic in response to those inputs. Human-facilitated inputs include button pushes, switches, sensors from devices like keyboards, touch screens, remotes, or card readers. High/low states for things like temperatures, pressure sensors, and liquid-level detectors, o r opened/closed states for things like pumps and values.

Inputs can include on/off states for things like mechanical switches, buttons, and encoders. The input data from sensors and machines are sent to the PLC. There are two main types of inputs: data inputs from devices and machines, and data inputs that are human-facilitated. The CPU then executes the user-created program logic and outputs data or commands to the machines and devices it is connected to. The input data is then processed by the CPU, which applies logic to the data, based on the input state. PLCs capture data from the plant floor by monitoring inputs that machines and devices are connected to. PLCs communicate, monitor and control automated processes like assembly lines, machine functions, or robotic devices.Ī PLC’s functions are divided into three main categories: inputs, outputs and the CPU. PLC’s act as the physical interfaces between devices on the plant or manufacturing floor and a SCADA or HMI system. SCADA and HMI systems enable users to view data from the manufacturing floor and provide an interface for users to provide control input - and PLCs are an essential hardware component element in these systems. Most PLCs today use one of the following 5 programming languages: Ladder Diagram, Structured Text, Function Block Diagram, Instruction List, or Sequential Function Charts. PLCs can be programmed in several ways, from ladder logic, which is based on electromechanical relays, to specially adapted programming languages of BASIC and C, to name a few. PLCs are widely used in a variety of industries because they’re fast, easy to operate and are considered easy to program. Some PLC’s can be customized with back planes and functional modules to fit different types of industrial applications. Some are small enough to fit in your pocket while others are large enough to require their own heavy-duty racks to mount. They are industrial computers used to control different electro-mechanical processes for use in manufacturing, plants, or other automation environments. PLC stands for Programmable Logic Controller.

So, what are PLCs and why are they so important in the world of automation? If you're familiar with industrial automation, you may have heard of PLCs.

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Plc ladder logic program