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选择长欣的理由：

【深圳长欣自动化设备有限公司】经过十二年的快速发展，现已成为国内zui 具实力的工控备件商之一

产品应用于：电力、石油、矿井提升、港口、供热、燃气、供水、污水处理、冶金、造纸、纺织、化工、水利等现代化工业领域！

对于单机装置，PLC系统是理想选择。当工厂配置多个PLC系统时，就会产生相互连接的要求。这一般很难实现，因为通常需要利用通信协议对数据进行映射。集成当然没有问题，但当有变更需求时，那用户的麻烦就来了：一旦某个PLC系统做了变更，就可能会导致两个PLC不能正常通讯，这是因为数据映射受到影响的缘故。对DCS系统而言，则根本不需要映射，配置变更只是一个简单的过程；控制器是系统自带的。效率和便于实现冗余，对将费用维持在预算内十分关键。功能需求：某些行业和设施需要历史数据库、流线型的报警管理、以及配置通用用户接口的中央控制室。有些则需要制造执行系统（MES）的集成、***的控制和资产管理。DCS系统内置这些应用，使其很容易被添加到自动化工程应用中，而无需增加独立的服务器，也不会增加集成成本。从这方面讲，DCS系统经济性更高，而且可以提高生产力，降低风险。生命周期投资回报率：设施的需求，因行业而异。对于规模较小的工艺工程，没有扩展需求，也不需要与其它工艺过程区域集成，因此PLC系统具有较好的投资回报率。DCS系统可能具有较高的安装成本，但从全生命周期来看，DCS系统所带来的产量增加和安***益，会抵消一部分成本。平衡短期需求与长期愿景,对操作确定性和改善工厂运行、维护非常关键。

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

Today, DCS technology has been relatively mature, and the degree of modularity is also relatively high. Statistics show that the probability of hardware failure is relatively low, so the software and hardware failures of DCS are mostly caused by human factors: failures caused by improper configuration, improper operation and other human factors are common.In the process of automatic instrument operation, once the system power failure occurs, it will bring fatal threat to DCS system. Problems such as poor plug contact, failure of automatic switching of standby power supply, insufficient circuit breaker capacity, mismatching of automatic instrument line load, power supply line accident and circuit component damage will all lead to system power failure. Common impacts include power interruption, voltage sag, overvoltage, undervoltage, etc. If the voltage is too high, it is easy to burn the board, while if the voltage is insufficient, it is easy to cause the board to fail to work normally, resulting in board fault light alarm, abnormal signal output and other phenomena. The interruption of power supply directly leads to the paralysis of DCS system.

The industrial characteristics of DCS application field determine that DCS system is mostly in the harsh electromagnetic environment formed by strong current equipment. It is often unrealistic to eliminate interference sources and improve the anti-interference ability of DCS system in application.

ABB 5SHX2645L0004 3BHL000389P0104 3BHB003154R0101 5SXE04-0150/GVC707AE01 
ABB PM866K01 3BSE050198R1
A-B 1756-ENBT/A
ATLAS TC-4000-S 
BENTLY 3500/92 136180-01 
EMERSON VE3007 KJ2005X1-BA1 12P4375X012
ABB LXN1604-6
TEWS TPMC815-11 
TRICONEX 4351B 
ENTERASYS A4H254-8F8T 
ABB LDGRB-01 3BSE013177R1
BENTLY 3500/15 106M1079-01 
ABB UNITROL 1020 UNS0119A-Z,V1 3BHE030579R0003 
B&R 5AP920.1505-01 
ABB UNITROL 1020 
GE IS215UCVEM09B 
EPRO PR9268/601-000
ABB V17152-310 
ABB AO2000-LS25
DANAHER S20660-SRS

HIMA F7126 
HIMA F7131 
HIMA F8650X 
HIMA F8627 
HIMA F8627X 
HIMA F3236 
HIMA F6217
HIMA F3330