WOODWARD 8402-319調速器,8402-319說明書
整個項目網(wǎng)絡分為四層結構
■ 基礎控制層（L1）
該網(wǎng)絡由兩個獨立的互為冗余的I/O總線構成，I/O總線包括本地I/O總線（LBUS）和擴展I/O總線（E-BUS），如圖1所示。WOODWARD 8402-319
■ 監(jiān)控層（L2）
該網(wǎng)絡由兩個獨立的互為冗余的過程控制網(wǎng)構成，主要用于DCS控制通信，以及ODS、OPC、AMS等數(shù)據(jù)的采集，
■ 操作管理層（L3）
該層網(wǎng)絡主要包括DCS管理層網(wǎng)絡（冗余SCnet網(wǎng)絡，分為A網(wǎng)、B網(wǎng)）。網(wǎng)絡層管理如圖3所示。
■ 調度管理層（L4）
該層網(wǎng)絡是基于WEB客戶端的調度管理網(wǎng)絡，主要連接各個分區(qū)的全局調度站、工藝工程師站、ODS客戶端、WEB服務器及其訪問客戶端（Office LAN）、ODS服務器的外部WEB訪問客戶端。這些WEB客戶端通過訪問L3.5層的服務器來獲得畫面數(shù)據(jù)和報表。
▲ LAN典型網(wǎng)絡結構示意圖（圖2）WOODWARD 8402-319調速器,8402-319說明書
▲ LAN典型網(wǎng)絡結構示意圖（圖2）
▲ 管理層網(wǎng)絡結構示意圖（圖3）
2.1 中控DCS網(wǎng)絡安全設計原則
■ 大型DCS系統(tǒng)數(shù)據(jù)庫須基于分布式數(shù)據(jù)庫結構
單數(shù)據(jù)庫的結構受到規(guī)?；南拗疲焕谙到y(tǒng)的可靠和穩(wěn)定。中控WebField ECS-700系統(tǒng)在設計之初就充分考慮了超大規(guī)模的DCS應用，因此專門在多系統(tǒng)數(shù)據(jù)庫的基礎上設計了“操作域”“控制域”的數(shù)據(jù)分區(qū)概念，更加匹配項目工程設計中的CCR操作分區(qū)、FAR的實際DCS監(jiān)控的物理分區(qū)。這將數(shù)據(jù)庫復雜的配置關系簡化到用戶易于理解的層級，方便用戶更好地搭建整個項目的DCS數(shù)據(jù)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
