《外文翻译-可编程逻辑控制器Programmable_logic_controller》-毕业论文.docVIP

精品 Programmable logic controller Cynthia Cooper From Wikipedia, the free encyclopedia A programmable logic controller or simply programmable controller is a digital computer used for HYPERLINK /wiki/Automation \o Automation automation of industrial processes, such as control of machinery on factory HYPERLINK /wiki/Assembly_line \o Assembly line 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 HYPERLINK /wiki/Non-volatile_storage \o Non-volatile storage non-volatile memory. A PLC is an example of a HYPERLINK /wiki/Real_time \o Real time real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result. Features Control panel with PLC (grey elements in the center). The unit consists of separate elements, from left to right; HYPERLINK /wiki/Power_supply \o Power supply power supply, controller, HYPERLINK /wiki/Relay \o Relay relay units for input and output. The main difference from other computers is that PLCs are armored for severe condition (dust, moisture, heat, cold, etc) and have the facility for extensive HYPERLINK /wiki/Input/output \o Input/output input/output (I/O) arrangements. These connect the PLC to HYPERLINK /wiki/Sensor \o Sensor sensors and HYPERLINK /wiki/Actuator \o Actuator actuators. PLCs read limit HYPERLINK /wiki/Switch \o Switch switches, analog process variables (such as temperature and pressure), and the positions of complex positioning systems. Some even use HYPERLINK /wiki/Machine_vision \o Machine vision machine vision. On the actuator side, PLCs operate HYPERLINK /wiki/Electric_motor \o Electric motor electric motors, HYPERLINK /wiki/Pneumatic \o Pneumatic pneumatic or HYPERLINK /wiki/Hydraulic \o