DCS指的是控制危险分散、管理和显示集中。60年代末有人研制了作逻辑运算的可编程序控制器（Programmable Logic Controller）。简称PLC。主要应用于汽车制造业。70年代中期以完成模拟量控制的DCS推向市场，代替以PID运算为主的模拟仪表控制。

DCS控制系统与PLC控制系统主要区别在: 一、首先是系统和局部的区别;DCS从系统来考虑,有许多特殊特性,如信息的收集和分析; 二、网络连接的紧密程度; 三、冗余方面完整性. 因为目前基本上高级的PLC都支持现场总线和ETHERNET,所以不能说PLC的开放性比DCS差,而且PLC也有支持C语言的,包含大容量内存,因此实现复杂的算法也是可以的，具体表现在以下方面：

1. DCS是一种“分散式控制系统”，而PLC只是一种(可编程控制器)控制“装置”，两者是“系统”与“装置”的区别。系统可以实现任何装置的功能与协调,PLC装置只实现本单元所具备的功能.  

2. 在网络方面,DCS网络是整个系统的**，和利时公司的MACS系统中的系统网采用的是双冗余的100Mbps的工业以太网，采用的国际标准协议TCP/IP。它是安全可靠双冗余的高速通讯网络，系统的拓展性与开放性更好.

而PLC因为基本上都为个体工作，其在与别的PLC或上位机进行通讯时，所采用的网络形式基本都是单网结构，网络协议也经常与国际标准不符。在网络安全上，PLC没有很好的保护措施。我们采用电源,CPU,网络双冗余.  

3. DCS整体考虑方案,操作员站都具备工程师站功能,站与站之间在运行方案程序下装后是一种紧密联合的关系，任何站、任何功能、任何被控装置间都是相互连锁控制, 协调控制;而单用PLC互相连接构成的系统，其站与站（PLC与PLC）之间的联系则是一种松散连接方式，是做不出协调控制的功能。

4. DCS在整个设计上就留有大量的可扩展性接口，外接系统或扩展系统都十分方便，PLC所搭接的整个系统完成后，想随意的增加或减少操作员站都是很难实现的。

5. DCS安全性：为保证DCS控制的设备的安全可靠，DCS采用了双冗余的控制单元，当重要

控制单元出现故障时，都会有相关的冗余单元实时无扰的切换为工作单元，保证整个系统的

安全可靠。PLC所搭接的系统基本没有冗余的概念，就更谈不上冗余控制策略。特别是当其

某个PLC单元发生故障时，不得不将整个系统停下来，才能进行更换维护并需重新编程。所以DCS系统要比其安全可靠性上高一个等级。

6. 系统软件，对各种工艺控制方案更新是DCS的一项**基本的功能，当某个方案发生变化后，工程师只需要在工程师站上将更改过的方案编译后，执行下装命令就可以了，下装过程是由系统自动完成的，不影响原控制方案运行。系统各种控制软件与算法可以将工艺要求控制对象控制精度提高。而对于PLC构成的系统来说，工作量极其庞大，首先需要确定所要编辑更新的是哪个PLC，然后要用与之对应的编译器进行程序编译，**后再用专用的机器（读写器）专门一对一的将程序传送给这个PLC，在系统调试期间，大量增加调试时间和调试成本，而且极其不利于日后的维护。在控制精度上相差甚远。这就决定了为什么在大中型控制项目中（500点以上），基本不采用全部由PLC所连接而成的系统的原因。

7. 模块：DCS系统所有I/O模块都带有CPU，可以实现对采集及输出信号品质判断与标量变换，故障带电插拔，随机更换。而PLC模块只是简单电气转换单元，没有智能芯片，故障后相应单元全部瘫痪。总而言之，从电厂搞维护而言DCS和PLC是有严格的界限的。锅炉、汽机、发电机三大主机的控制肯定用DCS控制，而PLC也只是应用于辅机如化学补给水系统、输煤系统、除灰渣系统及汽机保护（但不参与控制），还有一些厂家是自带的嵌入式PLC。DCS是从仪器仪表发展起来的控制系统，PLC是从顺序控制发展起来的，尽管在功能上相互渗透，但在实际应用中一般是不会有什么改变的。PLC和DCS的出现，是来自于不同专业口的。**主要的区别有以下几点：

1.响应速度不同。PLC**早出现的目的是代替继电器逻辑，因为继电器逻辑的响应速度一般都在几个毫秒以下，因此要求PLC的响应速度要快；而DCS**早出现的目的是代替二次仪表，一般仪表都是测量压力、流量、温度、液位等，响应速度都在几百个毫秒到几秒不等，要求响应速度不高，但控制的计算方法一般都比继电器逻辑复杂，因此DCS牺牲了速度去完成复杂的计算。

2.两者的扫描方式不同。PLC是从程序的开始一直扫描到程序结束，然后不断循环扫描，可以说是一根肠子通到底的方式；DCS是按控制环扫面，可以说是一个多任务同时工作的方式。

3.I/O冗余。DCS和PLC都能做到CPU冗余、电源冗余、底板冗余、网络冗余，但目前无论哪个品牌的PLC都没有做到I/O冗余，而DCS能做到I/O冗余。

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Motorola CPU Board MVME167-03B


MOTOROLA MVME147-023  


MOTOROLA  01-W3960B  ETC-1314-N DIGICEPT 01-W3992B


Motorola MVME339 MVME-339  


MOTOROLA MVME333S-2 


Motorola CPU Board MVME177-005


Motorola  MVME-162510A  


MOTOROLA MVME VME162-202  


Motorola MVME147 147SC-164-W5892B01B  


Motorola  MVME333S-2


Motorola MVME2600-1  


Motorola MVME147S-1  


Motorola MVME181-1 


Motorola MVME147   


Motorola MVME147-SA-2


Motorola MVME167-34B   


MOTOROLA MVME712M  


Motorola MVME332XT  


Motorola MVME165-03 VME CPU Board


Motorola MVME374 VME Module 6060-0003


MOTOROLA MVME147SRF MVME-147SRF  


Motorola MVME340B 01-W3787B01B  


Motorola MVME332XT  


Motorola MVME167-34B  


Motorola MVME187  


MOTOROLA VME MODULE MVME177-005  


Motorola MVME2600-2  


Motorola MVME187-04A  


MOTOROLA MVME1301 01-W3108F MPC603  


Motorola MVME712-103 Transition  


Motorola MVME121  


Motorola MVME162-523  


Motorola 01-W3914B  MVME187


Motorola MVME162FX Controller  MVME162-413


Motorola MVME162-242SE 16MB  


Motorola MVME332XTP  


Motorola MVME172-363 MVME172-363 


Motorola MVME328-1  


MOTOROLA MVME197LE 01-W3091F 


MOTOROLA MVME334B VME BOARD 01-W3875B  


MOTOROLA  MVME197LE RS530  


MOTOROLA MVME165A 68040  


Motorola MVME333S-2  


MOTOROLA MVME332XT 


MOTOROLA MVME162-522A  01-W3960B MVME 162-522A


MOTOROLA MVME167-031A  


Motorola MVME147-023  


Motorola MVME236-2  


Motorola MVME712M  


Motorola MVME147S-1  


Motorola MVME187-33A  


Motorola MVME224A-1  


MOTOROLA MVME334A VME BOARD 01-W3726B  


MOTOROLA MVME712-M  


Motorola MVME131  


Motorola MVME147-022  01-W3964B


Motorola  MVME712-102  


Motorola MVME712-104  


MOTOROLA MVME712-11  


Motorola  MVME333S-2  


Motorola MVME350  


MOTOROLA MVME162-013A  01-W3884B  


Motorola MVME147  


MVME333XT MVME333XT  


Motorola MVME162-212


Motorola MVME605  


Motorola MVME320  


Motorola MVME320-A1  


Motorola MVME400  


MOTOROLA MVME147SA-2 32MHz SBC MVME147SA-2  


Motorola MVME332XTS  


Motorola MVME376 with MVME712-376 


Motorola MVME-376  


MOTOROLA  MVME167-02A CPU 8M 01-W36908  


Motorola MVME712-101 Transition  


Motorola MVME147S-1  


Motorola MVME-733F Module MVME733F


Motorola MVME130DOF  


Motorola MVME162-223  


Motorola MVME162-523  


Motorola MVME167-02B  


Motorola MVME197LE 01-W3091F  


Motorola MVME162-212 Single Board Computer  


MOTOROLA MVME VME162-202 Single Board


MOTOROLA MVME147-022 VME BOARD 01-W3964B  


MOTOROLA  MVME332 Transition  


MOTOROLA MVME162-032 01-W3884B  


Motorola MVME167-34B


MOTOROLA MVME BOARD 01-W3580F   01-W3186F 


Motorola  MVME1600-011 01-W3066f 


Motorola MVME197LE 01-W3091F  


Motorola MVME332XTS & MVME 710B  


Motorola XR867KC-V3 MVME Drive Module DRMOD


Motorola  MVME197LE 01-W3091F  


Motorola  MVME946C Chassis MVME712B


Motorola MVME-946 946C Chassis


Motorola MVME PN 01-W3066F  01-W3180F  


Motorola MVME147S-1  


Motorola MVME340B 01-W3787B MVME340B  


Motorola MVME162PA 244LSE plus  IP-UNIDIG-I-D


MOTOROLA MVME162-432 01-W3960B  


Motorola MVME1600-001 MVME163-002  


MOTOROLA MVME147-022  01-W3347F-43A  30 DAY 


Motorola MVME167 Single Board Computer


Motorola EMI-1  


Motorola  MVME187  


MOTOROLA  MVME166-11A 01-W3179F 01A 30 DAY WARRANTY


Motorola MVME-376 VME Ethernet Control Board


MOTOROLA MVME-712-103  


Motorola MVMERS-232D


Motorola MVME148


Motorola MVME167-33B CPU Processor 


Motorola MVME147-013 CPU Board


Motorola Type MC1XXX  


Motorola  MVME335  


MOTOROLA MVME334B VME BOARD 01-W3875B  


Motorola  MVME338  


Motorola  MVME335  


Motorola MVME1301 Compact PCI MPC603 66MHz CPU 8MB  


Motorola MVME162-533A CPU Board


Motorola  MVME187-02A  


Motorola  MVME187-035A  


Motorola  MVME1600-011  MVME1603-073


Motorola  MVME187  


Motorola MVME162-533  


Motorola MVME5100-0131  


Motorola MVME5100 MVME5101-0131  


Motorola MVME4604-5 with PM604  


Motorola MVME712M 84-W839B01A  


Motorola MVME147S-1 84-W8577B01D  


Motorola MVME110-1 PCB AMAT 0100-11018


MOTOROLA MVME-133XT  


Motorola MVME762 with 01-W3128F  


Motorola MVME952 


Motorola MVME133 64-W5001B01A  


Motorola MVME121 


MOTOROLA MVME332XTS  


Motorola MVME333S-2, With A Motorola MVME705-1 


Motorola MVME147-012 A MPU VME Module


Motorola MVME147 64-W5401C02A  


MOTOROLA  MVME2604712 IO CPU BOARD


MOTOROLA MVME712-11  


Motorola MVME712M


Motorola MVME147S-1 64-W5892B01B


Motorola  MVME166-11A  


Motorola MVME2306 MV2306VX  


Motorola MVME162-23


MOTOROLA MVME2600-2 MVME2600  


MOTOROLA MVME2700-761 IO   01-W3287F  01-W1668B59D#1


Motorola MVME610 IO Module


Motorola MVME600 IO Module


Motorola MVME712M  


Motorola MVME-705A MVME705A  


MOTOROLA MVME104  


Motorola 01-W299D01D MVME  Cherokee SP309-1B


MOTOROLA MVME215-1 256Kb1Mb STAT RAM MEMORY MODULE