PLC的控制系统稳定性设计

摘要

PLC 的出现也就成了划时代的主而题，通过比较稳定的硬件和灵活的软件控制使得自动化走向了新的高潮。尤其是如今的互联网大潮下，可编程控制器和其它工业控制计算机组网构成大型的控制系统是可编程控制器技术的发展方向。目前的计算机集散控制系统DCS Distributed Control System）（中已有大量的可编程控制器应用。伴随着计算机网络的发展，可编程控制器作为自动化控制网络和国际通用网络的重要组成部分，将在

工业及工业以外的众多领域发挥越来越大的作用。

摘要分析了影响PLC控制系统可靠性的主要因素，从硬件安装、配置和软件编程方面提出了提高PLC系统可靠性的有效措施，其中硬件措施由电源的选择、输人输出的保护、完善的接地系统和Pi￡自身的改进4部分组成;软件措施包括提高输人输出信号的可靠性、信息的保护和恢复、互锁功能的设置、故障检测程序的设计、数据和程序的保护以及软件容错。

关键词:PLC控制系统可靠性设计硬件设计软件设计

Abstract

The PLC emergence also became the epoch-making topic,adding the vivid software control through a very and stable hardware,making the automation head for the new high tide. Judging from the development of the network, programmable controller and other industrial control computer networking constitute a large control system is programmable controller technology development direction. The current computer Distributed Control System DCS (Distributed Control System) in a large number of programmable controller applications. Along with the development of computer network, the programmable controller as automation control network and international general network will be an important part of the industry and industry, the numerous fields outside play an increasing role.

The main factors that influence the reliability of PLC control system.analyzed,and the effective measures for improving the reliability of RCcontrol system are explained from the hardware installation, configuration, and software progranuning. The Hardware measures include selection of power supply, protection of input and output, perfect grounding system and improvement of PLC itself. 'Ihe software measures include improving reliabili-ty of input signal and output signal,protection and recovery of information,establishment of function of interlocks, design of fault diagnostics, protectionof data and procedures, and software fault-tolerant. Keywords PLC:control system Reliability Hardware desSoftware0

目录

摘要............................................................................................................. 错误!未定义书签。ABSTRACT .................................................................................................... 错误!未定义书签。目录............................................................................................................. 错误!未定义书签。引言............................................................................................................. 错误!未定义书签。

1 影响PLC可靠性设计的因素 (3)

1.1来自空间的辐射干扰 (3)

1.2来自电源的干扰 (4)

1.3信号线引入的干扰 (3)

1.4来自接地系统混乱的干扰 (4)

1.5来自PLC系统内部的干扰 (3)

2 提高PLC控制系统可靠性的硬件措施 (2)

2.1漏电流的处理 (8)

2.2电源的选择 (3)

2.3输入输出的保护 (3)

2.4完善接地系统 (3)

2.5 PLC自身的改进 (3)

3 提高PLC控制系统可靠性的软件措施 (3)

3.1提高输入输出信号的可靠性 (3)

2.2信息的保护和恢复 (3)

3.3设置互锁功能 (3)

3.4故障检测程序的设计 (5)

3.5数据和程序的保护 (4)

3.6软件容错 (3)

结束语.................................................................................................................................... X VI 参考文献................................................................................................... 错误!未定义书签。