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基于 PLC的继电器安全控制系统设计

2021-08-21解紫城

机电工程技术 2021年12期

摘要:由于继电器安全控制系统设计过程中不明确发送主线程原理,导致系统反应时间过长,为此,设计基于 PLC的继电器安全控制系统。在设计系统硬件上,为保证系统性能得到有效提升,结合 PLC编程功能,选择带有触摸屏的工控机、合理配套芯片与数字流量卡,设计全新硬件结构。在设计系统软件上,选择 Profibus数据传输模式,建立数据处理单元,控制系统节点,设计 PLC 安全控制程序,控制触点与输出效果,建立发送主线程,避免电力线路在数据传输时产生影响,基于 PLC编程构建继电器安全控制模型,完成系统整体设计。实验结果表明:设计系统与两组传统系统相比较,在200Ω下,设计系统反应时间比两组传统系统分别提高0.940 s和2.003 s ,在1000Ω下,分别提高4.248 s和7.539 s ,由此可见,基于PLC的继电器安全控制系统反应时间明显改善。关键词:PLC编程;继电器;安全控制;系统设计

中图分类号:TN915.5;TP273             文献标志码:A        文章编号:1009-9492(2021)12-0167-04

Design of Relay Safety Control System Based on PLC Jie Zicheng

(Hefei University of Technology Design Institute (Group) Co., Ltd., Hefei 230001, China)

Abstract: Because the principle of sending main thread is not clear in the design process of the relay safety control system, the reaction time of the system is too long. Therefore, the relay safety control system based on PLC was designed. Based on the PLC programming function, the industrial control computer with touch screen, reasonable matching chip and digital flow card were selected to design a new hardware structure. On the design system software, select the Profibus data transmission mode, establish the data processing unit, control the system node, design the PLC security control program, control the contact and output effect, establish the main transmission line, avoid the influence of power line in data transmission, build relay safety control model based on PLC programming, complete the whole system design. The experimental results show that compared with the two groups of traditional systems, the reaction time of the design system is 0.940 s and 2.003 s, respectively under 200Ω. At 1000Ω, it increases by 4.248 s and 7.539 s respectively. The reaction time of relay safety control system based on PLC is obviously improved.   Key words: PLC programming; relay; safety control; system design

0 引言

继电器不仅是各大生产线设备的重要组成部分,也是铁路运输系统控制信号的核心元件,由于各大生产线设备一般都是24 h不间断地全天工作,因此设备的控制系统需安全稳定,继电器的工作状态也影响着铁路安全运行,因此继电器的安全控制系统尤为重要。目前,继电器的使用已经普及,但科学技术不断进步的同时,对于继电器的技术要求也越来越高。我国对于继电器一直到20世纪70年代末期才开始重视起来,虽起步稍晚一些,但进步空间很大。但是到目前为止,我国在继电器的发展上的进步空间还很大,还需要在高端技术上进一步研究[1]。……

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