MCGS在PLC工作狀態(tài)監(jiān)控系統(tǒng)中的應(yīng)用

1、MCG組態(tài)軟件在PLC工作狀態(tài)監(jiān)控系統(tǒng)中的應(yīng)用可編程控制器 ( PLC) 自問世以來 , 以其可靠性高、通用性強(qiáng)等優(yōu)點(diǎn) , 廣泛應(yīng)用 于工業(yè)自動化的各個(gè)領(lǐng)域。在使用 PLC 對各種制造裝備、自動化生產(chǎn)線等進(jìn)行 控制時(shí), 必須對各類故障做出實(shí)時(shí)正確的反應(yīng) ; 若發(fā)生意外 , 應(yīng)及時(shí)處理。因此, 為提高控制系統(tǒng)的整體效益 , 需要對 PLC 工作狀態(tài)監(jiān)控功能提出一定的要求。 目前, 常用的 PLC 工作狀態(tài)監(jiān)控方式主要有兩種。一種是利用與 PLC 配套的編 程軟件所具有的監(jiān)控功能 , 當(dāng) PLC 工作在監(jiān)控方式時(shí) , 在上位機(jī)的監(jiān)控界面中 , 以 PLC 程序語句閃爍等形式表示故障報(bào)警 , 監(jiān)控者

2、需要根據(jù) PLC 程序內(nèi)容推測 故障環(huán)節(jié) , 再予以排除。其技術(shù)要求高 , 現(xiàn)場工作有較大的困難。 另一種方法是 用 VC+、VB 等程序設(shè)計(jì)語言編制監(jiān)控程序軟件包 , 在上位機(jī)中以直觀的圖形界 面顯示 PLC 及被控對象的工作運(yùn)行狀態(tài) , 從而能夠形象顯示故障環(huán)節(jié)。但其軟 件設(shè)計(jì)工作難度高 , 編程量大 , 開發(fā)周期長。考慮到上述兩種方法的不足 , 以 MCGS工控組態(tài)軟件為開發(fā)平臺，通過相對容易的組態(tài)編程工作，較好實(shí)現(xiàn)可編 程控制器工作狀態(tài)監(jiān)控的功能?，F(xiàn)場總線技術(shù)是 20世紀(jì) 80年代后期發(fā)展起來的一種基于現(xiàn)場設(shè)備之間進(jìn)行通訊 的新型總線系統(tǒng)，它綜合了數(shù)字通信技術(shù)、計(jì)算機(jī)技術(shù)、自動控制技術(shù)

3、、網(wǎng)絡(luò)技 術(shù)和智能儀表等多種技術(shù)手段， 從根本上突破了傳統(tǒng)的“點(diǎn)對點(diǎn)”式的模擬信號 或數(shù)字一模擬信號控制的局限性，構(gòu)成一種全分散、全數(shù)字化、智能、雙向、互 連、多變量、多節(jié)點(diǎn)的通信與控制系統(tǒng)。 現(xiàn)場總線則是連接智能現(xiàn)場設(shè)備和自動 化系統(tǒng)的數(shù)字式、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡(luò)，其基礎(chǔ)是智能儀表。分散 在各個(gè)工業(yè)現(xiàn)場的智能儀表通過數(shù)字現(xiàn)場總線連為一體， 并與控制室中的控制器 和和監(jiān)視器一起構(gòu)成現(xiàn)場總線控制系統(tǒng) (Field Bus Control System, FCS) 。通 過遵循一定的國際標(biāo)準(zhǔn)，可以將不同廠商的現(xiàn)場總線產(chǎn)品集成在同一套FCS中，具有互換性和互操作性。FCS把傳統(tǒng)DCS的控制

4、功能進(jìn)一步下放到現(xiàn)場智能儀表， 由現(xiàn)場智能儀表完成數(shù)據(jù)采集、 數(shù)據(jù)處理、 控制運(yùn)算和數(shù)據(jù)輸出等功能。 現(xiàn)場儀 表的數(shù)據(jù) (包括采集的數(shù)據(jù)和診斷數(shù)據(jù) )通過現(xiàn)場總線傳送到控制室的控制設(shè)備上，控制室的控制設(shè)備用來監(jiān)視各個(gè)現(xiàn)場儀表的運(yùn)行狀態(tài)， 保存智能儀表上傳的數(shù)據(jù)，同時(shí)完成少量現(xiàn)場儀表無法完成的高級控制功能。另外，F(xiàn)CS還可以通過網(wǎng)關(guān)和企業(yè)的上級管理網(wǎng)絡(luò)相連， 以便管理者掌握第一手資料， 為決策提供依據(jù)。 所以現(xiàn)場總線具有開放性、 互操作性、 系統(tǒng)結(jié)構(gòu)的高度分散性、 靈活的網(wǎng)絡(luò)拓?fù)?結(jié)構(gòu)、現(xiàn)場設(shè)備的高度智能化、 對環(huán)境的高度適應(yīng)性等諸多突出特點(diǎn)。 盡管目前 對現(xiàn)場總線的研究尚未能形成一個(gè)完善的統(tǒng)一

5、標(biāo)準(zhǔn)， 但現(xiàn)場總線的高性能價(jià)格比 將吸引眾多工業(yè)控制系統(tǒng)采用。Work in the PLC configuration software MCGS Condition Monitoring System Programmable Logic Controller (PLC) since inception, with its high reliability, high universality, it is widely used in industrial automation fields. The use of PLC for various manufacturing equipm

6、ent, automated production lines, and control must be made on all kinds of real-time fault right response; if an accident should be a timely manner. Therefore, in order to improve the overall effectiveness of control systems need to work on the PLC to make certain state monitoring requirements.At pre

7、sent, the commonly used condition monitoring PLC work There are two ways. One is the use of matching with the PLC programming software with the monitoring function, when the PLC work in monitoring mode, monitoring the PC interface to flash the form of PLC program statement that failure alarm, monito

8、r the content of those procedures need to PLCspeculated that failure link, and then be excluded. The technical requirements for high on-site work more difficult. Another method is to use VC+ +, VB and other programming languages monitor program package preparation, the host computer in an intuitive

9、graphical interface displays the work of the PLC and the plant is running, which can link the image display failure. However, the high degree of difficulty of its software design, programming capacity, long development cycle. Taking into account the above two methods, with a view MCGS Configuration

10、Software as the platform to a relatively easy configuration through programming, programmable logic controller to achieve better working condition monitoring functions.Fieldbus technology is the 20th century, developed in the late 80s as a communication between field devices based on the new bus sys

11、tem, which combines digital communications technology, computer technology, automation technology, network technology and intelligent instruments and other technical means, a fundamental breakthrough in the traditional "point to point" of the analog signal or digital an analog signal contr

12、ol limitations, constitute a fully distributed, fully digital, intelligent, two-way, interconnect, multi-variable, multi-node communication and control system. Fieldbus intelligent field devices are connected and digital automation system, two-way transmission, multi-branch structure of the communic

13、ations network, based on smart meters. Scattered in various industrial field by digital field bus intelligent instruments as a single entity, and with the control room and monitor the controller and together constitute the field bus control system (Field Bus Control System, FCS). By following certai

14、n international standards, different vendors can be integrated fieldbus products in the same set of FCS with interchangeability, and interoperability. FCScontrol of the traditional DCS function further into the site under the intelligent instrument, intelligent instrument completed by the on-site da

15、ta collection, data processing, control algorithms, and data output function. Field instrument data (including collection of data and diagnostic data) sent to the control room through the field bus control device, the control room control equipment used to monitor the operational status of each fiel

16、d instrument, preservation intelligent instrument upload data simultaneously small field instrument can not be completed advanced control functions. In addition, FCS can also be superior gateway and enterprise management network connected to management first-hand information, provide the basis for the decision. Therefore, the fieldbus is open, interoperability, system architecture, a highly decentralized, flexible network topology, on-site equipment, highly intellig