- 型号:81725-02
- 数量:3
- 制造商: 厦门雄霸电子商务有限公司
- 有效期:2020/8/8 0:00:00
BENTLY 81725-02
BENTLY 81725-02
BENTLY 81725-02
可编程控制器的构成框图和计算机是相同的,都由中央处理器(CPU)、存贮器和输入/输出接口等构成。因此,从硬件结构来说,可编程控制器实际上便是计算机,图1是其硬件体系的简化框图。从图中能够看出PLC内部首要部件有:
(1)CPU(Central Process Unit)
CPU是PLC的核心组成部分,与通用微机的CPU相同,它在PLC体系中的作用类似于人体的神经中枢,故称为“电脑”。其功用是:
a、按PLC中体系程序赋予的功用,接纳并存储从编程器输入的用户程序和数据。
b、用扫描方法接纳现场输入装置的状况式数据,并存入映象寄存器或数据寄存器中。
c、确诊电源、PLC内部电路的作业状况和编程过程中的语法错误。
d、在PLC进入运行状况后,从存储器中逐条读取用户程序,经过指令解说后按指令规则的使命,产生相应的信号,去启闭有关控制门电路。分时分渠道地去履行数据的存取、传送、组合、比较和变换等操作,完结用户程序中规则的逻辑式算术运算等使命。依据运算成果,更新有关标志位的状况和输出映象寄存器的内容,再由输出映象寄存器的位状况式数据寄存器的有关内容,完成输出控制、制表、打印式数据通讯等。
PLC常用的CPU首要选用通用微处理器、单片机或双极型位片式微处理器。通用的微处理器常用的是8位机和16位机,如Z80A、8085、8086、6502、M6800、M6809、M68000等。单片机常用的有8039、8049、8031、8051等。双极型位片式微处理器常用的有AMD2900、AMD2903等。
①用通用微处理器作CPU
在低档PLC中,用Z80A做CPU较为遍及,Z80A用于PLC有如下长处: Z80(或Z80A)CPU及其配套的芯片廉价、遍及、通用,用这套芯片制成的PC,给修理及推行遍及带来方便。Z80有独立的输入/输出指令,而且指令格局较短,履行时间也较短,这样有利于扫描周期的缩短。Z80输入/输出指令格局较短,相应的输入/输出设备编码也较短,所以相应的译码硬件器较简单。因为Z80的信息是选用输入/输出映射方法,因此规划流程序时,对输入/输出与存储器寻址简单区别。
②用单片机作CPU
自从1974年出现单片机以来,已有不少产品选用单片机做可编程序控制器。日本三菱F系列PLC就选用美国INTEL公司MES-48系列的单片机8049和8039做处理器,8039单片机在一块片子上集成了8位的CPU,128×8的数据存储器。27条输入/输出线,T0、T1、INT测试线及8位定时器/计数器,时钟振荡电路等。
自80时代以来,出现了集成度更高。功用更强,并带有“布尔机”而又便于作数据通信的MCS-51系列单片机以及功用更高的16位单片机,大有取代MCS-48系列之势。日本三菱的F2系列PLC即选用CPU8031。MCS-51系列单片机是美国INTEL公司在MCS-48单片机基础上,于80时代初推出的产品,具有高集成度、高可靠性、高功用、高速度、低价格等特色。它有三个代表产品:8051、8751和8031,它们分别有不同的使用特性。8051是以4K字节EPR0M代替4K字节的R0M的8051; 8031是内部无R0M8051。必须外接EPR0M;INTEL公司的96系列的单片机,字长为16,运算速度比51系列更高,这必将为高层次的PLC开发和使用带来美好的远景。用单片机制成的PLC有以下显著特色:为机电设备一体化创造了条件,因为由单片机制成PLC,体积更小。一起PLC逻辑功用很强,而且具有数值运算和通信接口。
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