RELANCE 0-57100 全新靜態(tài)
經(jīng)過這些年來的不斷應(yīng)用，DCS系統(tǒng)在行業(yè)發(fā)展的一些局限性逐步體現(xiàn)出來，DCS存在的問題：
(1)1對1結(jié)構(gòu)。1臺儀表，1對傳輸線，單向傳輸1個信號。這種結(jié)構(gòu)造成接線龐雜、工程周期長、安裝費用高、維護困難。
(2)可靠性差。模擬信號傳輸不僅精確度低，且易受干擾。為此采用各種措施提高抗干擾性和傳輸精確度，其結(jié)果是增加了成本。
(3)失控狀態(tài)。操作員在控制室既不了解現(xiàn)場模擬儀表的工作狀況，也不能對其進行參數(shù)調(diào)整，更不能預(yù)測事故，導(dǎo)致操作員對其處于失控狀態(tài)。因操作員不能及時發(fā)現(xiàn)現(xiàn)場儀表故障，而發(fā)生事故已屢見不鮮。
(4)互操作性差。盡管模擬儀表已統(tǒng)一4～20mA信號標準，可大部分技術(shù)參數(shù)仍由制造商自定，致使不同品牌儀表無法互換。因此導(dǎo)致用戶依賴制造廠，無法使用性能價格比最優(yōu)的配套儀表，甚至出現(xiàn)個別制造商壟斷市場的局面。
DCS系統(tǒng)是繼PLC之外的一大自動化控制系統(tǒng)，它在化工、火電等領(lǐng)域的應(yīng)用極為廣泛，但是生產(chǎn)方面的自動化技術(shù)需求進一步提高，傳統(tǒng)的DCS系統(tǒng)已不能滿足需要，需要進行技術(shù)升級。
DCS系統(tǒng)由多臺計算機分別控制生產(chǎn)過程中多個控制回路，同時又可集中獲取數(shù)據(jù)、集中管理和集中控制的自動控制系統(tǒng)。分布式控制系統(tǒng)采用微處理機分別控制各個回路，而用中小型工業(yè)控制計算機或高性能的微處理機實施上一級的控制。
Poor interoperability. Although analog instruments have unified 4-20mA signal standards, most technical parameters are still determined by manufacturers, resulting in the inability to exchange instruments of different brands. Therefore, it leads to users relying on manufacturers, unable to use the most cost-effective supporting instruments, and even a situation where individual manufacturers monopolize the market.
development direction
DCS has become quite mature and practical in its development, and undoubtedly, it is still the mainstream application and selection of industrial automation systems. It will not immediately withdraw from the stage of on-site process control with the emergence of fieldbus technology. Faced with challenges, DCS will continue to develop along the following trends:
After years of continuous application, some limitations of DCS system in industry development have gradually emerged, and the problems existing in DCS are:
(1) 1 on 1 structure. 1 instrument, 1 pair of transmission lines, transmitting 1 signal in one direction. This structure results in complex wiring, long engineering cycles, high installation costs, and difficult maintenance.
(2) Poor reliability. Analog signal transmission not only has low accuracy, but is also susceptible to interference. Various measures are taken to improve anti-interference and transmission accuracy, resulting in increased costs.
(3) Out of control state. The operator in the control room is neither familiar with the working condition of the on-site simulation instrument, nor can they adjust its parameters, nor can they predict accidents, resulting in the operator being in a state of loss of control. It is not uncommon for accidents to occur due to the operator's inability to detect on-site instrument faults in a timely manner.
DCS system is a major automation control system besides PLC, which is widely used in fields such as chemical and thermal power. However, the demand for automation technology in production has further increased, and traditional DCS systems can no longer meet the needs and require technological upgrades.
The DCS system is an automatic control system that consists of multiple computers controlling multiple control loops in the production process, while also providing centralized data acquisition, management, and control. Distributed control systems use microprocessors to control each circuit separately, while small and medium-sized industrial control computers or high-performance microprocessors are used to implement higher-level control.