1756-cnb

ab 1756-cnb

有极强的自检及保护功能。

①故障检测——软件定期地检测外界环境，如掉电、欠电压、锂电池电压过低及强干扰信号等。以便及时进行处理。

②信息保护与恢复——当偶发性故障条件出现时，不破坏plc内部的信息。一旦故障条件消失，就可恢复正常，继续原来的程序工作。所以，plc在检测到故障条件时，立即把现状态存入存储器，软件配合对存储器进行封闭，禁止对存储器的任何操作，以防存储信息被冲掉。

③设置警戒时钟wdt（看门狗）——如果程序每循环执行时间超过了wdt规定的时间，预示了程序进入死循环，立即报警。

④加强对程序的检查和校验——一旦程序有错，立即报警，并停止执行。

⑤对程序及动态数据进行电池后备——停电后，利用后备电池供电，有关状态及信息就不会丢失。

   plc的出厂试验项目中，有一项就是抗干扰试验。它要求能承受幅值为1000v，上升时间1ns，脉冲宽度为1μs的干扰脉冲。一般，平均故障间隔时间可达几十万～上千万小时；制成系统亦可达4～5万小时甚至更长时间。

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厦门莫格电气自动化有限公司    

联系人：杨丽君（销售工程师）                                        

手   机：18050036945/0592-6808374

q     q：3443643092                        

邮    箱：3443643092@

传    真：0596-6514751（请备注杨工收）                      

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