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PLC520 | 2015-09-28 11:19:40    阅读:417   发布文章

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水电站的空间存在极强的电磁场,发电机的电压高达数千伏,电流高达数百安甚至数千安,开关站的输出电压高达数十千伏或数百千伏,发电厂的空间具有极强的电磁干扰。这种极强的电磁干扰将对PLC系统的通信、CPU的正常运行、PLC电源等造成影响。
        PLC是水电站计算机监控系统核心部件,并且自成系统,PLC系统的可靠性直接关系着整个计算机监控系统的可靠性,采取措施提高水电站PLC系统的可靠性是十分必要的。
2环境对PLC系统运行的影响
2.1开入的“假信号”可能造成PLC系统的误动
    若强电电缆和PLC的信号电缆不能有效地分隔开,甚至敷设在同一电缆沟内时,高电压、大电流电路接通和断开瞬间产生的强电干扰可能会在PLC输入信号线上产生很强的感应电压和感应电流,足以超出光电耦合器的抗干扰作用有效范围,使PLC输入端的光电耦合器中的发光二极管发光,使PLC输入点有效。这样的输入叫“假信号”或“误输入”,将导致PLC产生误动作。
    当PLC的开入模块上接到“误输入”时,其控制程序并不能识别,将依据既定的逻辑关系作出推断,并发出动作命令,同时将此“误输入”不加识别地传向后台计算机。这样的动作命令属于“误动”,可能造成意外停机甚至重大事故。
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