可编程逻辑控制器的可靠性分析

Reliability Analysis of Programmable Logic Controller

在现代工业科学技术领域,可编程逻辑控制器(PLC)已广泛应用于工业自动化,并已成为工业自动化的重要支柱。PLC系统不仅为现场仪表、电气设备及下属控制系统提供有效的集成、控制和数据存储,还为上级管控系统提供稳定的数据采集平台,这对提高企业的生产率和产品的国际竞争力具有重要作用。因此,维护PLC系统并确保其稳定运行非常重要。文章从PLC使用环境改善入手,如硬件配置、软件编制等,分析了影响PLC控制系统正常运行的温度、湿度、电源系统、防雷系统、接地系统、PLC的输入/输出接线、电缆桥架的铺设、控制室内布置等各种外部因素,同时给出了相应的解决方案。并根据实际使用情况和经验,分析了PLC本身的网络配置、模块配置、软件配置、画面配置等内部因素对PLC稳定运行的影响,提出了相应的合理化配置建议。

In the field of modern industrial science and technology,programmable logic controller(PLC)has been widely used in industrial automation and has become an important pillar of industrial automation.PLC system not only provides effective integration,control and data storage for field instruments,electrical equipment and subordinate control systems,but also provides a stable data acquisition platform for superior control systems,It plays an important role in improving the productivity of enterprises and the international competitiveness of products.Therefore,it is very important to maintain the PLC system and ensure its stable operation.This paper starts from improving the use environment of PLC;From the aspects of hardware confi guration and software programming,this paper analyzes various external factors affecting the normal operation of PLC control system,such as temperature,humidity,power supply system,lightning protection system,grounding system,input/output wiring of PLC,laying of cable bridge,layout of control room and so on,and gives the corresponding solutions.According to the actual use and experience,the infl uence of internal factors such as network confi guration,module confi guration,software confi guration and picture confi guration of PLC on the stable operation of PLC is analyzed,and the corresponding reasonable confi guration suggestions are given.