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<h2>PLCs - Programmable Logic Controllers</h2><p>A PLC (programmable logic controller) is an industrial digital computer designed for the control and automation of manufacturing processes or robotic devices. Programmable Logic Controllers are used where reliability control, simple programming and fault diagnosis is necessary. They were originally built to replace electromechanical relay systems in industrial automation.</p><p>A CPU (central processing unit) forms part of the PLC system. PLC CPUs are a microprocessor-based control system and act as the electronic circuitry within an industrial computer. They are usually built-in carry out instructions from the computer program via programming languages, performing basic mathematical, logical, control, input and output operations.</p><h3>PLC Applications</h3><p>PLC controllers are incredibly useful and have many applications across several industries such as manufacturing, food &amp; beverage, and building control. PLC's control the automation process in the machinery used for:</p><ul><li>Production plants</li><li>Traffic light controls</li><li>Packaging machines</li><li>Lifts and escalators</li><li>Medical applications</li><li>Automatic gate systems</li><li>Heating control systems</li></ul><h3>How do PLC's work?</h3><p>PLC Controller's respond to inputs from programming software and give a desired output. Programmable Logic Controllers can also include human-machine interfaces.</p><p>Different models use varying PLC Programs based on the programming languages used in the software. Programming languages that are used in PLC programming include:</p><ul><li>ST: Structured Text (text-based)</li><li>FBD: Function Block Diagram (graphic-based)</li><li>LAD: Ladder logic (graphic-based)</li><li>STL: Statement List (text-based)</li><li>SCL: Structured Control Language (graphic-based)</li></ul><p>PLC programming can be quite complex but there are simpler, image-based options available such as Ladder Logic that has user-friendly Ladder diagrams to understand and improve processes. Laptop and software are usually used for Ladder Logic and Ladder Diagrams, however, some older models use handheld controllers.</p><h2>Types of PLC's</h2><p>Programmable Logic Controllers can be categorised in multiple ways, each with different functions, features and capabilities. For example, Soft PLC's are software based and use their own operating system but do not have their own CPU. Whereas, Hard PLC's are hardware based and typically only include the essential control functions. The full range of programmable controllers include:</p><ul><li>Hard PLC's</li><li>Soft PLC's</li><li>Compact PLC's</li><li>Slot PLC's</li><li>Unitary PLC's</li><li>Modular PLC's</li></ul><p>Programmable Controllers can also be made more efficient by using equipment such as, <a href="https://uk.rs-online.com/web/c/automation-control-gear/plcs-hmis-industrial-computing/hmi-displays/">HMI Displays</a>, DIN Rails, and Communication modules (such as MODBUS) which can be enhanced into a highly functional automated control system with <a href="https://uk.rs-online.com/web/c/automation-control-gear/plcs-hmis-industrial-computing/plc-accessories"> PLC accessories.</a> More information can be found in our <a href="/web/content/discovery/ideas-and-advice/plcs-programmable-logic-controllers-guide">PLCs guide</a>.</p>

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Programmable Logic Controllers | PLCs | RS

PLCs - Programmable Logic Controllers

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<p>Allen Bradley Programmable Logic Controllers are used where reliability control, simple programming and fault diagnosis is necessary. PLC controllers are incredibly useful and have many applications across several industries such as manufacturing, food & beverage, and building control. PLC Controller's respond to inputs from programming software and give a desired output, meaning they are versatile and integral to customising your processes.</p><p>Allen Bradley are well know in many industries for their machine safety range of products, and are mainstay in automation and control applications. From every aspect of machine processes, Allen Bradley provide safe, reliable components that put the safety of the operator first. Efficiency and safety are at the heart of Allen Bradleys offer, with high quality and reliable parts to suit the most demanding industries.</p><p> Allen Bradley combine with RS Components customer first attitude to get you the parts you need in the timeframe you need them. For a service you can trust.</p>

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<p>What is a PLC?</p><p>A Programme Logic Controller (PLC) is a digital industrial computer used to monitor input, output, and robotic devices as well as monitoring automatic processes whilst making decisions of the control of output items. A PLC is used to ensure that fault diagnosis, reliability and programming is up to standards. A PLC reacts to a programming software to give the desired output and they can be enhanced by adding DIN Rails, and HMI Displays. Please look at our PLC Accessories selection!</p><p>Part of a Programme Logic Controller is formed by a Central Processing Unit (CPU) which circulates electricity within the computer, it is made up of a microprocessor system and programme basic numerical, logical operations.</p><p>PLCs have various applications used across many different industries and are included in the machinery used in Lifts and Escalators, Heating Systems, Medical devices, traffic light controls and many more.  Please browse our Phoenix Contact Programme Logic Controllers featuring Hard PLCs, Soft PLCs, Modular PLCs, Unitary PLCs, Slot PLCs and Company PLCs- available for next day delivery!</p>

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PLC's -Programmable Logic Controllers | Siemens PLC’s | RS

<p>Siemens PLC's, which you may know as Programmable Logic Controllers are industrial digital computers that have been designed for the control and automation of manufacturing processes or robotic devices.</p><p>Siemens PLC's are used where reliability control, simple programming and fault diagnosis are needed. A CPU (Central Processing Unit) forms part of the PLC system. PLC CPUs are a microprocessor-based control system that act as the electronic circuitry within an industrial computer. They are usually built-in carry out instructions from the computer program via programming languages, performing basic mathematical, logical, control, input and output operations.</p><p>You'll need a PLC for applications such as traffic light controls, packaging machines, lifts and escalators, heating control systems and pretty much any kind of automating system that has been installed within an industrial or commercial environment.</p><p>Choose from our range of Siemens PLC's, Siemens is a global leading brand that is a focused technology company, they create technology that empowers customers to positively transform industries. From more resource-efficient factories, resilient supply chains, and smarter buildings and grids, to cleaner and more comfortable transportation as well as advanced healthcare, Siemens creates technology with purpose, adding real value for customers.</p>

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