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PLC与DCS的基本结构是一样的。PLC发展到今天，已经移植到计算机系统控制上了，传统的编程器早就被淘汰。小型应用的PLC一般使用触摸屏，大规模应用的PLC使用计算机系统。和DCS一样，控制器与IO站使用现场总线（一般都是基于RS485或RS232异步串口通讯协议的总线方式），控制器与计算机之间如果没有扩展的要求，也就是说只使用一台计算机的情况下，也会受用这个总线通讯。但如果有不止一台计算机使用，系统结构就会和DCS一样，上位机平台使用以太网结构。这是PLC大型化后和DCS概念模糊的原因之一。

PLC和DCS的发展方向：

小型化的PLC将向更化的使用角度发展，比如功能更加有针对性、对应用的环境更有针对性等等。大型的PLC与DCS的界限逐步淡化，直至完全融合。

DCS将向FCS的方向继续发展。FCS的核心除了控制系统更加分散化以外，特别重要的是仪表。FCS在国外的应用已经发展到仪表级。控制系统需要处理的只是信号采集和提供人机界面以及逻辑控制，整个模拟量的控制分散到现场仪表，仪表与控制系统之间无需传统电缆连接，使用现场总线连接整个仪表系统。（目前国内有横河在中海壳牌石化项目中用到了FCS，仪表级采用的是智能化仪表例如：EJX等，具备世界的控制水准）PLC与DCS无法比较，PLC是控制器，是孤立的产品，而DCS是系统。但PLC可以与DCS的控制站比较，PLC的循环周期在10毫秒左右，而DCS控制站在500毫秒左右，PLC的开放性更好，作为产品其独立工作的能力更强。

型号：

ABB(S800系列）

英维思(3008, 3625, 3508E. 3721, 3700A 4351B)

本特利(3500/42M， 3500/ 22M, 3500/95.3500/05)

黑马(F3330, F3236, F6217, F7126, F8621A)

福克斯波罗(FBM203, FBM204, FBM217, FMB231)

AB: (1746 1747 1756 1770 1771 1785 触摸屏2711系列CPU PLC) .

普罗索芙特PROSOFT MVI46/56/69, AB旗下，跟AB很像,模块

横河YOKOGAWA AAI, ADV, ADI, ANB, AMM, SB, PW(型号开头),卡件模块(CPU,电源,输出，PLC)

摩尔MOORE Q开头, 3开头模块,显示器

DCS is a system, including upper software, network and controller, while PLC is only a control. To form a system, the upper SCADA system and the network connected with it are also required. For PID loop control, Mitsubishi&＃39;s process controller can also realize FBD programming like SAMA configuration; DCS system is larger, the number of control loops is more, and there are more controls and algorithms, which can complete the control between more complex loops. Hardware reliability is similar. DCs can achieve i/o redundancy, but PLC cannot. Relatively speaking, the cost of the system composed of PLC is lower.DCS is a kind of "distributed control system", which hardware includes field controller, operator station computer, engineer station computer, and network system to contact them; DCS software is an overall scheme, which solves all technical problems of a system, and all parts of the system are closely combined. PLC is a device, which is equivalent to the field controller in DCS in hardware; The software is a partial scheme, and the organization between stations is loose.

Analyzing the difference between DCs and PLC, there are two key points: first, DCS is distributed control, with a global database; Second, PLC is a sequential scanning mechanism, and DCS is a time-based control. Our system conforms to the first point. For example, the modification of an i/o tag can also be synchronously reflected in HMI.

ABB PM866K01 3BSE050198R1 
BENTLY 3500/92 136180-01 
ABB TB852 3BSC950263R1 
ABB TP830 3BSE018114R1 
TOSHIBA 2N3A8204-B 
PACIFIC SCIENTIFIC R43HCNAR2NSVS00 
AMAT 0090-76110 VME PCB 

ABB PM866K01 3BSE050198R1 
BENTLY 3500/92 136180-01 
ABB TB852 3BSC950263R1 
ABB TP830 3BSE018114R1 
TOSHIBA 2N3A8204-B 
PACIFIC SCIENTIFIC R43HCNAR2NSVS00
AMAT 0090-76110 VME PCB 

MOOG D136-002-005带D138-002-002加密狗

HIMA K9203 996920302  
HIMA K9203A 996920360 
TRICONEX 3664 
Agilent HP 5517B 
RELIANCE 805405-1R 1***
YOKOGAWA AIP571 
YOKOGAWA PW502 
MSPC MSPC-6886/6800