LYCOS RETRIEVER 
Programmable Logic Controller
built 636 days ago
A Programmable Logic Controller (PLC), or programmable controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed or non-volatile memory. A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result.
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A PLC or Programmable Logic Controller is a user friendly, microprocessor specialized computer that carries out control functions of many types and levels of complexity. Its purpose is to monitor crucial process parameters and adjust process operations accordingly. It can be programmed, controlled and operated by a person unskilled in operating computers. Essentially, a PLC's operator draws the lines and devices of ladder diagrams with a keyboard onto a display screen. The resulting drawing is converted into computer machine language and run as a user program.
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Programmable Logic Controllers emphasizes practical use of the PLC in process and industrial control systems. The textbook begins with the basics of what a PLC is and does, then guides students through the fundamentals of programming the device. Applications, testing procedures, and operational aspects of PLC equipment and systems are discussed. This text covers the most common programmable logic controller functions, providing practical examples based on the widely used Allen-Bradley Small Logic Controller (SLC 500) series of PLCs. Wiring and programming of a PLC are covered thoroughly, using numerous examples. A supplemental Laboratory Manual provides a wealth of hands-on activities that will help students practice and hone their PLC programming skills.
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New AutoLog® PLC (Programmable Logic Controller) models support variety of serial plug-in communication modules. Available plug-in modules are: RS-232 / RS-485 module, Modbus TCP (Ethernet) module, Ethernet LAN/WLAN server module. Read more from AutoLog® Accessories pages!
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The Programmable Logic Controller has been used in the mining industry for about 15 years. The PLC takes the place of mechanical relays, time delay relays, and a host of other electrical control functions that are routinely performed on a dragline. It ... provides for more precise applications such as shoe synchronization, hoist and drag limits, boom tightline protection, production monitors, and lube systems.
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The LC880 goes far beyond the functions of a digital delay generator, pulse generator, logic delay or logic controller, integrating all of these functions and more in a single unit. The LC880 is field proven daily in gas dynamics, fluid flow, and material science experiments at national research facilities and major universities worldwide. In applications from gas dynamics to fracture mechanics, the LC880 is earning its place among function generators, oscilloscopes and power supplies as an indispensable lab tool.
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Programmable Logic Controller