1785-L30B 处理器模块 AB/Allen Bradley罗克韦尔

1785-L30B 处理器模块 AB/Allen Bradley罗克韦尔

可编程控制器，简称PLC（Programmable logic Controller）,是指以计算机技术为基础的新型工业控制装置。

在1987年国际电工委员会（International Electrical Committee）颁布的PLC标准草案中对PLC做了如下定义：

“PLC是一种专门为在工业环境下应用而设计的数字运算操作的电子装置。它采用可以编制程序的存储器，用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令，并能通过数字式或模拟式的输入和输出，控制各种类型的机械或生产过程。

PLC及其有关的外围设备都应该按易于与工业控制系统形成一个整体，易于扩展其功能的原则而设计。

Programmable logic Controller (PLC) refers to a new type of industrial control device based on computer technology.

In the draft PLC standard issued by the International Electrical Committee in 1987, the PLC was defined as follows:

"PLC is an electronic device specifically designed for digital computing operations in an industrial environment. It uses a memory that can be programmed to store instructions for performing operations such as logical operations, sequential operations, timing, counting and arithmetic operations, and can control various types of machinery or production processes through digital or analog inputs and outputs.

PLC and its related peripherals should be designed in accordance with the principle that it is easy to form a whole with the industrial control system and easy to expand its function.