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(1)DCS系统是个大系统，其控制器功能强而且在系统中的作用十分重要，数据公路更是系统的关键，所以，必须整体投资一步到位，事后的扩容难度较大。而FCS功能下放较，信息处理现场化，数字智能现场装置的广泛采用，使得控制器功能与重要性相对减弱。因此，FCS系统投资起点低，可以边用、边扩、边投运。
(2)DCS系统是封闭式系统，各公司产品基本不兼容。而FCS系统是开放式系统，用户可以选择不同厂商、不同的各种设备连入现场总线，达到的系统集成。
(3)DCS系统的信息全都是二进制或模拟信号形成的，必须有D/A与A/D转换。而FCS系统是全数字化，就免去了D/A与A/D变换，高集成化高性能，使精度可以从±0.5%提高到±0.1%。
(4)FCS系统可以将PID闭环控制功能装入变送器或执行器中，缩短了控制周期，目前可以从DCS的每秒2--5次，提高到FCS的每秒10--20次，从而改善调节性能。
(5)DCS系统可以控制和监视工艺全过程，对自身进行诊断、维护和组态。但是，由于自身的致病弱点，其I/O信号采用传统的模拟量信号，因此，它无法在DCS工程师站上对现场仪表(含变送器，执行器等) 进行远方诊断、维护和组态。FCS系统采用全数字化技术，数字智能现场装置发送多变量信息，而不仅仅是单变量信息，并且还具备检测信息差错的功能。FCS系统采用双向数字通信现场总线信号制。因此，它可以对现场装置(含变送器，执行机构等)进行诊断、维护和组态。FCS系统的这点优越性是DCS系统无法比拟的。
(6)FCS系统由于信息处理现场化，与DCS系统相比，可以省去相当数量的隔离器、端子柜、I/O终端、I/O卡件、I/O文件及I/O柜。同时也节省了I/O装置及装置室的空间与占地面积，有*认为可以省去60%。
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ALLEN BRADLEY TOUCHSCREEN ONLY FOR 2711-T14C1 2711-T14C3 2711-T14C8 2711-T14C15
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ALLEN BRADLEY H-4075-R-H00AA USPP H4075RH00AA
DIAGRAPH 8701-975 NSFP 8701975Core aligning splicer
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ATLAS COPCO TENSOR-DS4 USPP TENSORDS4
Challenger Three Phase Transformer
Berkeley Varitronics The Coyote
Allen Bradley Size 6 500-GO 93 Motor Starter 480V 592-TPD630 Sz 6 AB 500-GO 930
Baldor VS Drive H2 Inverter Technology VS 1SP450-1B 50 HP With FDB3125 Enclosure
Control Techniques, Unidrive UNI-1405, 4.0 KW, 6 months, UNI1405Allen Bradley Industrial Computer 6180-ELKEFLAZFCZ ++ Factory Refurbished ++
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