WOODWARD 8402-319調(diào)速器,8402-319說(shuō)明書
整個(gè)項(xiàng)目網(wǎng)絡(luò)分為四層結(jié)構(gòu)
■ 基礎(chǔ)控制層（L1）
該網(wǎng)絡(luò)由兩個(gè)獨(dú)立的互為冗余的I/O總線構(gòu)成，I/O總線包括本地I/O總線（LBUS）和擴(kuò)展I/O總線（E-BUS），如圖1所示。WOODWARD 8402-319
■ 監(jiān)控層（L2）
該網(wǎng)絡(luò)由兩個(gè)獨(dú)立的互為冗余的過(guò)程控制網(wǎng)構(gòu)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(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(diào)度管理層（L4）
該層網(wǎng)絡(luò)是基于WEB客戶端的調(diào)度管理網(wǎng)絡(luò)，主要連接各個(gè)分區(qū)的全局調(diào)度站、工藝工程師站、ODS客戶端、WEB服務(wù)器及其訪問(wèn)客戶端（Office LAN）、ODS服務(wù)器的外部WEB訪問(wèn)客戶端。這些WEB客戶端通過(guò)訪問(wèn)L3.5層的服務(wù)器來(lái)獲得畫面數(shù)據(jù)和報(bào)表。
▲ LAN典型網(wǎng)絡(luò)結(jié)構(gòu)示意圖（圖2）WOODWARD 8402-319調(diào)速器,8402-319說(shuō)明書
▲ LAN典型網(wǎng)絡(luò)結(jié)構(gòu)示意圖（圖2）
▲ 管理層網(wǎng)絡(luò)結(jié)構(gòu)示意圖（圖3）
2.1 中控DCS網(wǎng)絡(luò)安全設(shè)計(jì)原則
■ 大型DCS系統(tǒng)數(shù)據(jù)庫(kù)須基于分布式數(shù)據(jù)庫(kù)結(jié)構(gòu)
單數(shù)據(jù)庫(kù)的結(jié)構(gòu)受到規(guī)模化的限制，不利于系統(tǒng)的可靠和穩(wěn)定。中控WebField ECS-700系統(tǒng)在設(shè)計(jì)之初就充分考慮了超大規(guī)模的DCS應(yīng)用，因此專門在多系統(tǒng)數(shù)據(jù)庫(kù)的基礎(chǔ)上設(shè)計(jì)了“操作域”“控制域”的數(shù)據(jù)分區(qū)概念，更加匹配項(xiàng)目工程設(shè)計(jì)中的CCR操作分區(qū)、FAR的實(shí)際DCS監(jiān)控的物理分區(qū)。這將數(shù)據(jù)庫(kù)復(fù)雜的配置關(guān)系簡(jiǎn)化到用戶易于理解的層級(jí)，方便用戶更好地搭建整個(gè)項(xiàng)目的DCS數(shù)據(jù)庫(kù)結(jié)構(gòu)。
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
