可编程逻辑控制器

中文译文
可编程逻辑控制器(中文4500字,英文2800字)
可编程逻辑控制器（PLC）或可编程序控制器是用于机电自动化过程中的数字计算机，例如生产线上的机械控制、游乐设施或照明装置的控制。可编程控制器广泛运用于工业机器中。与通用的计算机不同的是，PLC是专为多个输入和输出管理，扩展温度范围、免受电磁噪音影响、抗震动和冲击所设计。控制器的操作程序通常存储在电池供电或非易失性的内存中。PLC是实时的系统，因为系统产生的输出结果必须在有限的时间内回馈到输入，否则会导致意外操作。
1. 历史

英文原文
Programmable logic controller
A programmable logic controller (PLC) or programmable controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or lighting fixtures. PLCs are used in many industries and machines. 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.

[资料来源：Doc163.com]