WOODWARD 8402-319調速器,8402-319說(shuō)明書(shū)
整個(gè)項目網(wǎng)絡(luò )分為四層結構
■ 基礎控制層（L1）
該網(wǎng)絡(luò )由兩個(gè)獨立的互為冗余的I/O總線(xiàn)構成，I/O總線(xiàn)包括本地I/O總線(xiàn)（LBUS）和擴展I/O總線(xiàn)（E-BUS），如圖1所示。WOODWARD 8402-319
■ 監控層（L2）
該網(wǎng)絡(luò )由兩個(gè)獨立的互為冗余的過(guò)程控制網(wǎng)構成，主要用于DCS控制通信，以及ODS、OPC、AMS等數據的采集，
■ 操作管理層（L3）
該層網(wǎng)絡(luò )主要包括DCS管理層網(wǎng)絡(luò )（冗余SCnet網(wǎng)絡(luò )，分為A網(wǎng)、B網(wǎng)）。網(wǎng)絡(luò )層管理如圖3所示。
■ 調度管理層（L4）
該層網(wǎng)絡(luò )是基于WEB客戶(hù)端的調度管理網(wǎng)絡(luò )，主要連接各個(gè)分區的全局調度站、工藝工程師站、ODS客戶(hù)端、WEB服務(wù)器及其訪(fǎng)問(wèn)客戶(hù)端（Office LAN）、ODS服務(wù)器的外部WEB訪(fǎng)問(wèn)客戶(hù)端。這些WEB客戶(hù)端通過(guò)訪(fǎng)問(wèn)L3.5層的服務(wù)器來(lái)獲得畫(huà)面數據和報表。
▲ LAN典型網(wǎng)絡(luò )結構示意圖（圖2）WOODWARD 8402-319調速器,8402-319說(shuō)明書(shū)
▲ LAN典型網(wǎng)絡(luò )結構示意圖（圖2）
▲ 管理層網(wǎng)絡(luò )結構示意圖（圖3）
2.1 中控DCS網(wǎng)絡(luò )安全設計原則
■ 大型DCS系統數據庫須基于分布式數據庫結構
單數據庫的結構受到規?；南拗?，不利于系統的可靠和穩定。中控WebField ECS-700系統在設計之初就充分考慮了超大規模的DCS應用，因此專(zhuān)門(mén)在多系統數據庫的基礎上設計了“操作域”“控制域”的數據分區概念，更加匹配項目工程設計中的CCR操作分區、FAR的實(shí)際DCS監控的物理分區。這將數據庫復雜的配置關(guān)系簡(jiǎn)化到用戶(hù)易于理解的層級，方便用戶(hù)更好地搭建整個(gè)項目的DCS數據庫結構。
Machine vision. Due to the limitation of data transmission rate, visual function cannot be provided on PLC platform. PAC machine vision can detect product defects and errors that are difficult to measure by traditional methods.
8) Improve productivity. A general portable control engine and integrated engineering development platform allow rapid development, implementation and migration of project engineering; Moreover, because of its openness and flexibility, it ensures the seamless connection between control points, operations and enterprise business systems, optimizes the factory process and improves production efficiency.Reduced operating costs. Users can choose products from different standards and technologies rather than from the perspective of generic components and systems; Users are only required to be trained on a unified platform and development environment, rather than learning a variety of special environments; It provides users with a seamless
