MCGS在PLC工作状态监控系统中的应用

1、For pers onal use only in study and research; not for commercial useMCG组态软件在PLC工作状态监控系统中的应用可编程控制器(PLC)自问世以来,以其可靠性高、通用性强等优点,广泛应用 于工业自动化的各个领域。在使用 PLC对各种制造装备、自动化生产线等进行 控制时，必须对各类故障做出实时正确的反应；若发生意外，应及时处理。因此, 为提高控制系统的整体效益，需要对PLC工作状态监控功能提出一定的要求。目前,常用的PLC工作状态监控方式主要有两种。一种是利用与PLC配套的编程软件所具有的监控功能，当PLC工作在监控方式时，在上

2、位机的监控界面中， 以PLC程序语句闪烁等形式表示故障报警,监控者需要根据PLC程序内容推测 故障环节，再予以排除。其技术要求高，现场工作有较大的困难。另一种方法是 用VC+ VB等程序设计语言编制监控程序软件包，在上位机中以直观的图形界 面显示PLC及被控对象的工作运行状态，从而能够形象显示故障环节。但其软 件设计工作难度高，编程量大，开发周期长。考虑到上述两种方法的不足，以 MCGS工控组态软件为开发平台，通过相对容易的组态编程工作，较好实现可编 程控制器工作状态监控的功能。For pers onal use only in study and research; not for comm

3、ercial use现场总线技术是20世纪80年代后期发展起来的一种基于现场设备之间进行通讯 的新型总线系统，它综合了数字通信技术、计算机技术、自动控制技术、网络技 术和智能仪表等多种技术手段，从根本上突破了传统的“点对点”式的模拟信号 或数字一模拟信号控制的局限性，构成一种全分散、全数字化、智能、双向、互 连、多变量、多节点的通信与控制系统。现场总线则是连接智能现场设备和自动 化系统的数字式、双向传输、多分支结构的通信网络，其基础是智能仪表。分散 在各个工业现场的智能仪表通过数字现场总线连为一体，并与控制室中的控制器和和监视器一起构成现场总线控制系统 (Field Bus Con trol

4、System, FCS)。通过遵循一定的国际标准，可以将不同厂商的现场总线产品集成在同一套FCS中，具有互换性和互操作性。FCS把传统DCS勺控制功能进一步下放到现场智能仪表， 由现场智能仪表完成数据采集、 数据处理、 控制运算和数据输出等功能。 现场仪 表的数据 (包括采集的数据和诊断数据 )通过现场总线传送到控制室的控制设备 上，控制室的控制设备用来监视各个现场仪表的运行状态， 保存智能仪表上传的 数据，同时完成少量现场仪表无法完成的高级控制功能。另外，FCS还可以通过网关和企业的上级管理网络相连， 以便管理者掌握第一手资料， 为决策提供依据。 所以现场总线具有开放性、 互操作性、 系统结

5、构的高度分散性、 灵活的网络拓扑 结构、现场设备的高度智能化、 对环境的高度适应性等诸多突出特点。 尽管目前 对现场总线的研究尚未能形成一个完善的统一标准， 但现场总线的高性能价格比 将吸引众多工业控制系统采用。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 in

6、dustrial automation fields. The use of PLC for various manufacturing equipment, 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 n

7、eed to work on the PLC to make certain state monitoring requirements.For personal use only in study and research; not for commercial useAt present, 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 fun

8、ction, when the PLC work in monitoring mode, monitoring the PC interface to flash the form of PLC program statement that failurealarm, monitor the content of those procedures need to PLCspeculated that failure link, and then be excluded. The technical requirements for high on-site work more difficul

9、t.Another method is to use VC+ +, VB and otherprogramming languages monitor program package preparation, the host computer in an intuitive 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 it

10、s software design, programming capacity, long development cycle. Taking into account the above two methods, with a view MCGS Configuration Software as the platform to a relatively easy configuration through programming, programmable logic controller to achieve better working condition monitoring fun

11、ctions.Fieldbus technology is the 20th century, developed in the late 80s as a communication between field devices based on the new bus system, which combines digital communications technology, computer technology, automation technology, network technology and intelligent instruments and other techn

12、ical means, a fundamental breakthrough in the traditional point to point of the analog signal or digital an analog signal control limitations, constitute a fully distributed, fully digital, intelligent, two-way, interconnect, multi-variable, multi-node communication and control system. Fieldbus inte

13、lligent field devices are connected and digital automation system, two-way transmission, multi-branch structure of the communications 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 m

14、onitor the controller and together constitute the field bus control system (Field Bus Control System, FCS). By following certain international standards, different vendors can beintegrated fieldbus products in the same set of FCS within tercha ngeability,and in teroperability.FCSc on trol of the tra

15、diti onalDCS function further into the site under the intelligent instrument, intelligent instrument completed by the on-site data collection, data process ing, con trol algorithms, and data output fun cti on. Field in strume nt data (in cludi ng collect ion of data and diag no stic data) sent to th

16、e control room through the field bus control device, the control room control equipment used to monitor the operational status of each field in strume nt, preservati on in tellige nt in strume nt upload data simulta neously small field in strume nt can not be completed adva need con trol fun cti ons

17、. In additi on, FCS can also be superior gateway and en terprise man ageme nt n etwork conn ected to man ageme nt first-ha ndinformation,provide the basis for the decision. Therefore, the fieldbusis ope n, in teroperability,system architecture, a highly dece ntralized,flexible network topology, on-s

18、ite equipment, highly intelligent,highlyadaptable to the en vir onment and many other outsta nding features.Although current studies have not been able to field bus to form a complete unified standard, but the high cost performance fieldbus will attract a nu mber of in dustrial con trol system.團仅供个人用于学习、研究；不得用于商业用途For personal use only in study and research; not for commercial use