美国GE模块F650-G-N-A-B-F-2-G-1-HI-C-E供应控制DCS系统系列型号全

¥3600.00 1个起批
¥2950.00 ≥2

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ABB原装PPD512 A10-15000 3BHE040375R1023供应DCS系统原装控制器 ¥2950.00

ABB SPASI23供应DCS系统原装模块欧美进口优势库存备货系列全 ¥2950.00

WESTINGHOUSE 1C31194G01 供应DCS系统欧美进口艾默生卡件 ¥2950.00

HONEYWELL SPS5785 51198651-100 供应DCS系统欧美进口电源模块 ¥2950.00

EMERSON原装 A6140 9199-00058供应DCS系统欧美进口艾默生卡件模块 ¥2950.00

BENTLY 3500/92 136180-01供应DCS系统欧美进口电源模块卡件整套一系列 ¥2950.00

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PLC的程序一般不能按事先设定的循环周期运行。PLC程序使从头到尾执行一次后又从头开始执行。（现在一些新型PLC有所改进，不过对任务周期的数量还是有限制）而DCS可以设定任务周期。比如，快速任务等。同样是传感器的采样，压力传感器的变化时间很短，我们可以用200ms的任务周期采样，而温度传感器的滞后时间很大，我们可以用2s的任务采样周期。这样，DCS可以合理的调度控制器的资源。一般来讲，DCS惯常使用两层网络结构，一层为过程级网络，大部分DCS使用自己的总线协议，比如横河的Modbus、西门子和ABB的Profibus、ABB的CANbus等，这些协议均建立在标准串口传输协议RS232或RS485协议的基础上。现场IO模块，特别是模拟量的采样数据十分庞大，同时现场干扰因素较多，因此应该采用数据吞吐量大、抗干扰能力强的网络标准。基于RS485串口异步通讯方式的总线结构，符合现场通讯的要求。IO的采样数据经CPU转换后变为整型数据或实型数据，在操作级网络（***层网络）上传输。因此操作级网络可以采用数据吞吐量适中、传输速度快、连接方便的网路标准，同时因操作级网络一般布置在控制室内，对抗干扰的要求相对较低。因此采用标准以太网是选择。TCP/IP协议是一种标准以太网协议，一般我们采用100Mbit/s的通讯速率。PLC系统的工作任务相对简单，因此需要传输的数据量一般不会太大，所以常见的PLC系统为一层网络结构。过程级网络和操作级网络要么合并在一起，要不过程级网络简化成模块之间的内部链接。PLC不会或很少使用以太网。

从应用对象的规模上来说：

PLC一般用在小型自控场所，比如设备的控制或少量的模拟量的控制及连锁，而大型的应用一般都是DCS。当然，这个概念不准确，但很直观，习惯上我们把大于600点的系统成为DCS，小于这个规模叫做PLC。

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

The basic structure of PLC and DCS is the same. Today, PLC has been fully transplanted to computer system control, and the traditional programmer has long been eliminated. Small application PLC generally uses touch screen, and large-scale application PLC fully uses computer system. Like DCS, the controller and IO station use fieldbus (generally based on RS485 or RS232 asynchronous serial communication protocol). If there is no expansion requirement between the controller and the computer, that is, only one computer is used, this bus communication will also be used. However, if more than one computer is used, the system structure will be the same as DCS, and the upper computer platform will use Ethernet structure. This is one of the reasons for the fuzzy concept of PLC and DCS after the large-scale.Miniaturized PLC will develop to a more professional perspective, such as more targeted functions, more targeted application environment, and so on. The boundary between large-scale PLC and DCS is gradually weakened until it is fully integrated.

DCS will continue to develop in the direction of FCS. In addition to the more decentralized control system, the core of FCS is instrumentation. The application of FCS in foreign countries has developed to the instrument level. The control system only needs to deal with signal acquisition and provide man-machine interface and logic control. The control of the whole analog quantity is distributed to the field instrument. There is no need for traditional cable connection between the instrument and the control system, and the field bus is used to connect the whole instrument system. (at present, Yokogawa has used FCS in the CNOOC Shell Petrochemical Project in China, and the instrument level adopts intelligent instruments, such as ejx, which has the world&＃39;s most advanced control level.)

VIBRO 200-560-000-113 VM600
ABB AIM0006 2RCA021397A0001F
ABB COM0003 2RAA005844A0006A
ABB REF615C_C HCFFAEAGANB2BAN1XC空框架
ABB REF615C_C HCFFAEAGANB2BAN1XC主机
GE IS200AEPCH1BAA
GE IS210AEBIH3BEC
GE IS210BPPBH2BMD
GE IS200WETBH1ABA
A-B 1756-ENBT/A
EMERSON A6140 9199-00058
BENTLY 3500/92 136180-01
HONEYWELL SPS5785 51198651-100
WESTINGHOUSE 1C31194G01
GE F650-G-N-A-B-F-2-G-1-HI-C-E
ABB PPD512 A10-15000 3BHE040375R1023
ABB SPASI23
ELAU SM-100-40-080-P0-45-S1-B0
PACIFIC SCIENTIFIC R43HCNAR2NSVS00
BECKHOFF CX1020N000
BECKHOFF CX11000001
GE PCH1026
A-B 1336-TR-SP4A/A
GE F650-B-F-G-F-2-G-1-HI-E