供應%1746-OW8電機%國外進口備件，超低供應

3.1 dcs的定義

　　dcs是分布式控制系統（distributed control system）的簡稱，亦稱為集散控制系統，它是由回路儀表控制系統發展而來，是在計算機、通訊、控制和crt技術迅速發展的基礎上產生的。

3.2 dcs的發展歷程

　　上世紀60年代以后，隨著生產工程的大型化和復雜化，誕生了計算機集中監視和控制的集中控制系統。集中控制方便了監視、操作和管理，同樣也使危險性高度集中，系統一旦故障，對裝置造成的影響和危險性都是非常大的。隨著微處理機的誕生，為新型控制系統的開放創造了無比*的條件。1975年，隨著計算機、通訊、控制和crt 4c技術的不斷發展和完善，美國honeywell*向推出了分散控制系統tdc-2000，從*套dcs誕生至今，dcs系統已經經歷了3個發展階段。

　　1975至1980年為初創階段。由于軟硬件技術的限制，此時的dcs系統性能還不十分完善，硬件結構還不十分成熟。

　　1981至1987年為第2個階段。這一時期容錯、冗余技術已經成熟使用，系統可靠性很高，性能十分*，各種控制功能十分豐富。在該階段dcs從單純的工業過程自動化控制向生產管理自動化發展。這一代的dcs主要將lan（local area network）技術引入，使dcs的網絡功能大大加強。

　　1987至今為第3個發展階段。各廠家采用標準化組織（iso）開放系統互連（osi）結構基礎上產生制造自動化協議（map）標準來解決不同機型的互連問題。 dcs系統在硬件上使用了更*的cpu及冗余技術，存儲容量及通訊速度大幅度提高，軟件上采用通用操作系統。在該階段dcs將控制、監督和管理調度有機結合起來，實現了各種生產經營信息的自動化管理。

3.3 dcs的特點和功能

　　（1）dcs的主要特點。dcs具有以下主要特點：控制與顯示分離；采用網絡通信技術；完備的開放系統；可靠性高；具有綜合性和專業性；實現了人機對話技術；系統擴展靈活；管理能力強。

　　（2）dcs的主要功能。dcs系統能很好的完成工業連續控制、回路儀表控制等，dcs多年的實踐表明，其在連續控制領域已經成為一種成熟的技術和完善的控制系統，同時其友好的人機界面、建立在冗余技術上的可靠性、強大的網絡功能、單一的數據庫、組態靈活等特點得到了廣大用戶的好評。

3.4 dcs的發展趨勢

　　dcs在連續控制領域有這極其重要的地位，到目前為止，對于dcs未來發展問題有許多爭論，但下面的幾個問題是大多數認識認為dcs急需解決的問題；

　　（1）開放性。關于開放性，這個問題是制約dcs發展的一個很大的因素，由于dcs各廠家對于自己的網絡協議和系統軟件采取嚴格的保密措施，這就造成了如果別的廠家的plc或其它的控制設備就不可能很好的無縫的接入dcs控制系統，往往需要經過復雜的協議轉換，得到的通訊速率和通訊能力都很不理想，例如honeywell公司的tps系統和ab公司的plc5系列的plc進行通訊就需要通過串口并加上雙方為通訊開發出來的輔助設備來實現，但當通訊量較大時，其實時性就大大降低，這個問題就阻礙了dcs的應用領域和競爭力。目前一些dcs廠家已經意識到該問題的嚴重性，目前honeywell公司主推的pks控制系統就采取了controlnet的通訊網絡，舍棄了傳統的lcn網，且采用了服務器結構的形式，使其開放性大大加強。除去通信問題以外，操作系統、數據庫、人機界面、控制策略的組態等方面，都有開放性問題，所以隨著技術進步，dcs的開放性需要逐漸加強，而且還應發揮其特色，使分散型計算機控制系統，從傳統dcs中解放出來，使dcs與cips系統的調度層、管理層、決策層（輔助決策層）進行無縫連接，將dcs的相關信息上傳，使其實時數據庫、歷史數據庫為上述３層所共用，避免重復建庫，為*控制和優化建好平臺，與上層的關系數據庫共享數據，真正實現管控一體化。

　　（2）價格。關于價格，當然應從性能價格比、產品生命周期及用戶根據實際生產裝置的自控要求對dcs進行選型、工程費用、維修費用等方面綜合考慮。更重要的是目前plc系統、工控機系統（ipc）的價格都是以廉價著稱，所以dcs廠商在這方面面臨的形勢很嚴峻，今后dcs應在降低成本、減少維修費用、發展遠程診斷和維護及完善服務體系等方面多下功夫，應對plc和ipc與之的競爭。

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Reliance 0-52861-1
Reliance 0-52862
Reliance 0-52874-1
Reliance 0-52875-1
Reliance 0-52876
Reliance 0-54323-2
Reliance 0-54339-1
Reliance 0-54379-1
Reliance 0-54394-1
Reliance 0-54394-10
Reliance 0-55304
Reliance 0-55307
Reliance 0-55325-66
Reliance 0-55325-8
Reliance 0-55325-9
Reliance 0-56301
Reliance 0-56302
Reliance 0-56303
Reliance 0-56304-2
Reliance 0-56305-2
Reliance 0-56308-1
Reliance 0-56311
Reliance 0-56313
Reliance 0-56313-1
Reliance 0-57002
Reliance 0-57003
Reliance 0-57160
Reliance 0-57170
Reliance 0-57200
Reliance 0-57401-C
Reliance 0-57404-2F
Reliance 0-57405-D
Reliance 0-57406-D
Reliance 0-57408-B
Reliance 0-57412
Reliance 0-57413
Reliance 0-57552
Reliance 0-58219-30
Reliance 0-58504
Reliance 0-58719-B
Reliance 0-60000
Reliance 11C409S
Reliance 11C57S
Reliance 11C59S
Reliance 14C103
Reliance 14C104
Reliance 14C204
Reliance 14C310U
Reliance 1SU44003
Reliance 2GU41002
Reliance 2SI3000
Reliance 411027-51S
Reliance 45C1
Reliance 45C15 / C
Reliance 45C15A
Reliance 45C1A
Reliance 45C201
Reliance 45C305
Reliance 45c307a
Reliance 45C321
Reliance 45C340
Reliance 45C344
Reliance 45C37A
Reliance 45C40
Reliance 45C42
Reliance 45C60
Reliance 45C63
Reliance 45C66
Reliance 45C66A
Reliance 45C67
Reliance 45C69
Reliance 45C901
Reliance 45C913
Reliance 45C92
Reliance 45C940
Reliance 45C966
Reliance 54394
Reliance 54394-1
Reliance 57402-C
Reliance 57406
Reliance 57407-4
Reliance 57407-4
Reliance 57491
Reliance 57516
Reliance 57C329
Reliance 57C330
Reliance 57C409
Reliance 57C410A
Reliance 57C411
Reliance 57C416
Reliance 57C421A
Reliance 57C421B
Reliance 57C430
Reliance 57C431
Reliance 57C435
Reliance 57C491
Reliance 57C554
Reliance 601739-Y
Reliance 610273-14s
Reliance 612404-7R
Reliance 612405-9R
Reliance 612405-9R
Reliance 61C22A
Reliance 801443-8ZS
Reliance 803456-21T
Reliance 803456-2R
Reliance 803456-37RC
Reliance 803612-SE
Reliance 805403-2R
Reliance 805405-1R
Reliance 84543-133
Reliance 9VT401-014HTAN
Reliance F-014962
Reliance Motomatic II
Reliance S-6R8512
Reliance SP500
Reliance WU4001179
Remote Display RD-300
Remote Display RD-300
Renishaw a-2037-0010-03
Rice Lake Weighing Systems IO-810-3A
Rosemount 8712ct12m4
Rosemount 8712ct12m4
Saftronics CIMR-G3U21P5
Saftronics CIMR-G3U42P2
Saftronics CIMR-G3U47P5
Saftronics CIMR-G3U47P5
Samsung LT133X2-154
Scharer 16pc8-3
Scharer 19pc10-1
Schleicher UBA 32/2A C 31409245 713 095
Schleicher UBE 32 ID D 31410062 735 035
Schleicher UBT 16 31106777 42 065
Schleicher UCN20 C 31309837 723 075
Schleicher UKE B 31806981 284 085
Schleicher UKK 100
Schleicher UKZ 31806980 285 095
Schleicher UNG24 31208162 268 095
Schleicher USA 8/1 D/2.1 31511134 880 075
Schleicher USA 8/1 D/2.1 31511134 880 075
Schleicher USB 8-1 D/2.1
Schleicher USP 2A U 31507501 622 075
Schleicher USP 2A U 31507501 622 075
Schleicher USP 2A U 31507501 622 114
Schleicher USP 2A U 31507501 622 114
Schrack RU 110 060
Schroff 20800-188
Seco Q7002
Seco Q7002
Seco Q7002
Seco se2125
Seco SE2302
Servo Dynamics Corp SD2-3060-163-1
Shawmut A4BY 1000
Shawmut TRS250R
Shibaura ID-11005-2
Shimaden SR2201-21B
Sick 7023059
Sick WSU26-120
Sick WSU26-120
Siemens
Siemens 305-01AD
Siemens 305-01BJ
Siemens 305-01T
Siemens 305-04B
Siemens 305-20N
Siemens 305-20T
Siemens 305-22P
Siemens 305-25N