TRICON 3002
TRICON 3002
TRICON 3002
节 PLC概念
1、PLC的基本概念
可编程控制器(Programmable Controller)是计算机家族中的一员，是为工业控制应用而设计制造的。早期的可编程控制器称作可编程逻辑控制器(Programmable Logic Controller)，简称PLC，它主要用来代替继电器实现逻辑控制。随着技术的发展，这种装置的功能已经大大过了逻辑控制的范围，因此，这种装置称作可编程控制器，简称PC。但是为了避免与个人计算机(Personal Computer)的简称混淆，所以将可编程控制器简称PLC
2、PLC的基本结构
PLC实质是一种于工业控制的计算机，其硬件结构基本上与微型计算机相同，如图所示：
a. 中央处理单元(CPU)
中央处理单元(CPU)是PLC的控制中枢。它按照PLC系统程序赋予的功能接收并存储从编程器键入的用户程序和数据；检查电源、存储器、I/O以及警戒定时器的状态，并能诊断用户程序中的语法错误。当PLC投入运行时，首先它以扫描的方式接收现场各输入装置的状态和数据，并分别存入I/O映象区，然后从用户程序存储器中逐条读取用户程序，经过命令解释后按指令的规定执行逻辑或算数运算的结果送入I/O映象区或数据寄存器内。等所有的用户程序执行完毕之后，后将I/O映象区的各输出状态或输出寄存器内的数据传送到相应的输出装置，如此循环运行，直到停止运行。
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