PLC - Programmable Logic Controller

Browse the IndustrySearch PLC Programmable Logic Controllers directory to find suppliers, equipment, products and information. A Programmable Logic Controllers, or PLC is a specialised computer hardware platform designed to send and receive data for electromechanical processes. A PLC – Programmable Logic Controller typically consists of a central processing unit (CPU) and a number of electrical inputs and outputs. Most industrial PLC – Programmable Logic Controller devices are modular, with various input and output modules available. A common type of module used in industry is a 24-volt direct current (24 VDC) interface, which may receive a signal (either on or off) from a device such as a switch that detects the presence of an object or sends a signal (again, on or off) to a device such as a solenoid valve that activates a pneumatic cylinder and moves the object, depending on the devices configuration. Many accessories exist for PLC – Programmable Logic Controllers that include more specialised input/output modules, sensors for nearly any detection application, as well as a multitude of devices which can be controlled. As the name suggests, the PLC – Programmable Logic Controller requires a program in order to function. Programs are typically created in a visual style known as “ladder logic” or “machine coding” which takes the form of schematics used by electricians to map the way electrical devices are connected. Suppliers of PLC – Programmable Logic Controller devices will typically offer all the accessories required to put them into operation. Many will also provide services for setting up programs and educating the end user on their features and functions.

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