YOKOGAWA CP451-50控制单元

控制单元是整CPU的指挥控制中心，由指今寄存器IRInstruction Register)、指令译码器ID(Instruction Decoder)和操作控制器0COperationController等，对协调整个电脑有序工作极为重要。它根据用户预先编好的程序，依次以存储器中取出各条指令，放在指今寄存器IR中，通过指今举码(分析 确定应该进行什么操作，然后通过操作控制器OC，按确定的时序，向相应的部件发出微绿作控制信号。操作控制器OC中主要包括节拍脉中发生器、控制矩阵、时钟脉冲发生器、复位电路和启停电路等控制逻辑.

YOKOGAWA CP451-50运算单元

是运算露的核心。可以执行算术运算(包括加减乘数等基本运算及其附加运)和逻污算(包括移位、逻测试或两人值比较]，相对控制单元而言运算器接受控制单元的命令而进行动作，即运算单元所进行的全部操作都是由控制单元发出的控制信号来指挥的，所以它是执行部件。存储单元

YOKOGAWA CP451-50包括CPU片内缓存和寄存器组，是CPU中暂时存放数据的地方，里面保存着那些等待处理的数据，或已经处理过的数据，CPU访问寄存器所用的时间要比访问内存的时间短，采用寄存器，可以减少CPU访问内存的次数，从而提高了CPU的工作速度，但因为受到芯片面积和集成度所限，寄存器组的容量不可能很大，寄存器组可分为专用寄存器和通用寄存器，专用寄存器的作用是固定的，分别寄存相应的数据。而通用寄存器用途广泛并可由程序员规定其用途，通用寄存器的数目因微处理器而异

Control unit

The control unit is the command and control center of the whole CPU, consisting of lnstruction Register IR/Instruction Register)instruction Decoder ID(Instruction Decoder), Operation Controller 0C(Operation Controller), etc. It is very important to keep the wholecomputer in order. According to the user’s preprogrammed program, it takes out each instruction from the memory in tumn, puts it irthe instruction registerIR,determines what operation should be carred out through instruction decoding (analysis), and then sends outthe microoperation control signal to the corresponding component through the operation controler 0C, according to the determinedtime sequence. Operation controller 0C mainly includes beat pulse generator, control matrix, clock pulse generator, reset circuit andpower off circuit control logic.

Arithmetic unit

s the core of the computer. You can perform arithmetic operations (including basic operations such as addition and subtractionmultipliers and their additionaloperations) and logical operations (including shifts, logical tests, or comparisons of two values;. Relativeto the control unit, the computer accepts the command of the control unit and caries out the action, that is, all the operations carriedout by the arithmetic unit are commanded by the control signal issued by the control unit, so it is the executive componentStorage unit

These include in-chip caches and recister banks, which are temporary stores of data in the CPU that are waiting to be processed or thathave already been processed. The CPU spends less time accessing registers than it does accessing memory. The use of reqisters canreduce the number of times the CPU accesses the memory, thus improving the CPU working speed. However, due to the limited chiarea and integration dearee, the capacity of the register bank cannot be very large. Recister groups can be divided into special reqistersand general reaisters.The function of special reaisters is fixed,respectively storing the corresponding data. General purpose registersare versatile and can be specified by the programmer. The number of general purpose registers varies from microprocessor tomicroprocessor

主营：世界的PLC、DCS,伺服系统.机器人系统备件模块.

〖⒈〗Allen-Bradley(美国AB)系列产品》

〖⒉〗(施耐德电气)系列产品》

〖⒊〗General electric(通用电气)系列产品》

〖⒋〗Westinghouse（美国西屋）系列产品》

〖⒌〗SIEMENS(西门子系列产品)》

〖⒍〗销售ABB?Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、Panasonic Robots、MOTOMAN Robots

〖⒎〗estinghouse（西屋）：?OVATION系统、WDPF系统、MAX1000系统备件。

〖⒏〗Invensys Foxboro（福克斯波罗）：IA Series系统，FBM（现场输入输出模块）顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入输出信号处理、数据通信及处理等。Invensys Triconex?冗余容错控制系统、基于三重模件冗余（TMR）结构的现代化的容错控制器。。

〖9〗Bosch Rexroth（博世力士乐）：Indramat，IO模块,PLC控制器,驱动模块等。

〖10〗Motorola（摩托罗拉）：MVME 162、MVME 167、MVME1772、MVME177等系列。

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5.4内存容量

PLC内存有用户及体系两大大都。用户内存用以存储用户程序，单个的还将其间的一有些划为体系用。体系内存是与CPU装备在一起的。CPU既要具有拜访这些内存的才干，还应供给相应的存储介质。

用户内存巨细与可存储的用户程序量有关。内存大，可存储的程序量大，也就可进行更为杂乱的操控。从开展趋势看，内存容量老是在不断增大着。大型PLC的内存容量可达几十k，以致于一百多k。体系内存关于用户，体如今PLC能供给内部器材。不一样的内部器材占有体系内存的不一样区域。在物理上并无这些器材，仅仅为RAM。但经过运转程序进行运用时，给运用者供给的却实实在在有这些器材。

内存器材品种越多，数量越多，越便于PLC进行各种逻辑量及模仿操控。

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