A class of industrially hardened devices that provides hardware interface for input sensors and output actuators PLCs can be programmed using relay ladder logic to control the outputs based on input conditions and / or algorithms contained in the memory of the PLC
A Programmable Logic Controller is a controller which stores instructions to command a device, such as a valve, to which it is connected to start up, operate and shut down
A type of computer used to perform low level controlling and monitoring of hardware, such as power supplies, vacuum controllers, and radiation safety systems The acronym stands for "programmable logic controller"
Public Limited Company Denotes any company which has share capital of at least a fixed amount
In Britain, plc means a company whose shares can be bought by the public and is usually used after the name of a company. plc is an abbreviation for `public limited company'. Compare Ltd. British Telecommunications plc. public limited company a large company in Britain which has shares that the public can buy. Guinness PLC Imperial Chemical Industries PLC Rolls Royce PLC BP PLC British Petroleum Co. PLC British American Tobacco PLC B.A.T Industries PLC 1976-98
A programmable logic controller (PLC) uses programmed logic instructions to control banks of inputs and outputs which interface timed switch actuation to external electro-mechanical devices
Programmable Logic Controller These computers replace relay logic and usually have PID controllers built into them PLCs are very fast at processing discrete signals (like a switch condition) The most popular PLC manufacturer's are Allen Bradley, Modicon, GE, and Siemens (or TI)
A Public Limited Company in the UK is a company limited by shares and having an authorised share capital of not less than £50,000
the transmission of communication signals across utility powerlines or existing home wiring Frequencies may range from 8 kHz to 200 kHz and above and power levels are normally low (in the 1 to 20 watt range) The advantages of these systems include their ability to send signals over very long transmission lines (more than 100 miles) and their reliability However, they are limited in the amount of information they can transport because of narrow bandwidths Their low-frequency signals are severely attenuated by capacitor banks and transformers and can be overcome
Programmable Logic Controller Also know as a programmable controller, these devices are used for machine control and sequencing
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