厦门莫格电气自动化有限公司

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DCS400

DCS400
更新时间:2017-09-19
点击关注:73
供应分类:福建电子、电工 > 厦门PLC
发布企业:厦门莫格电气自动化有限公司
发布 IP:106.122.*.*
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详细介绍

DCS400

 

核心提示:节对有关PLC的硬件组成的热点疑问作了解答,对今后的实际接线安装操作有较大帮助。 一、问:PLC的硬件结构是怎样的? 答:PLC的硬

节对有关PLC的硬件组成的热点疑问作了解答,对今后的实际接线安装操作有较大帮助。 
  一、 问:PLC的硬件结构是怎样的? 
  答:PLC的硬件组成与微型计算机相似,其主机由CPU板、存储器、输入/输出(I/O)接口、电源等几大部分组成;可配备如编程器、图形显示器、通信接口等外部设备(见硬件示意图)。 
  二、 问:CPU是什么?有什么作用?  

  答:CPU也称中央处理器,是由一片或几片大规模集成电路芯片组成的,相当于人的大脑,是PLC的核心部分;CPU的作用是可通过接口及软件向系统的各个部分发出各种命令,同时对被测参数进行巡回检测、数据处理、控制运算、报警处理及逻辑判断等,实现对整个PLC的工作过程进行控制;目前大多数小型PLC都用8位或者16位单片机作CPU。 
  三、 问:RAM、ROM、EPROM、EEPROM都是存储器,各自特点是什么? 
  答:RAM为随机存储器,一般都是CMOS型的,耗电极微,在PLC中通常用锂电池作后备,失电时也不会丢失程序;ROM为只读存储器,系统程序固化在其中,用户不可更改,失电不受影响;EPROM为可擦除存储器,其写入和擦除时都必须要用专用的写入器和擦除器,用户很不方便;EEPROM为电可擦除只读存储器,其内部的程序可通过编程器的写入和擦除。 
  四、 问:PLC中的I/0口是什么?有什么特点? 
  答:I/O接口是输入(IN)/输出(OUT)接口的简称,是PLC主机与被控对象进行信息交换的纽带;PLC通过I/O接口与外部设备进行数据交换,PLC的输入输出信号有开关量、模拟量、数字量三种类型,所有的输入输出信号均经过光电等隔离,大大增强了PLC的抗干扰能力。 

 


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【主 营】: PLC模块 DCS系统备件· 机器人配件
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询价留言(*为必填项)
厦门莫格电气自动化有限公司
所在地区:
福建 厦门 
联系地址:
厦门市思明区槟榔西里197号第四层B19单元 
联 系 人:
黄工
联系电话:
0592-6808384 
传真:
0592-6514751 
联系手机:
18050037105 
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