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    Siemens RWR490.40/MCQ
    发布者:fzjfx0001  发布时间:2019-08-20 13:50:43  访问次数:

    Siemens RWR490.40/MCQ现货 in stock! 欢迎来电咨询~!!

    Siemens RWR490.40/MCQ


    DCS系统在工业生产过程的广泛应用,使可靠性、稳定性问题更加突出,也使人们对整个系统要求越来越高。人们希望DCS系统尽量少出故障,又希望DCS系统一旦出现故障,能尽快诊断出故障部位,并尽快修复,使系统重新工作。下面简单介绍故障大体分类及故障诊断的一般方法。
      一、DCS系统故障的分类
      为了便于分析、诊断DCS系统故障发生的部位和产生原因,可以把故障大致分为如下几类。
      1、现场仪表设备故障
      现场仪表设备包括与生产过程直接联系的各种变送器、各种开关、执行机构、负载等。现场仪表设备发生故障,直接影响DCS系统的控制功能。在目前的DCS控制系统中,这类故障占绝大部分。这类故障一般是由于仪表设备本身的质量和寿命所致。
      2、系统故障
      这是影响系统运行的全局性故障。系统故障可分为固定性故障和偶然性故障。这类故障一般比较明显且影响也是局部的,它们主要是由使用不当或使用时间较长,模板内元件老化所致。
      3、硬件故障
      这类故障主要指DCS系统中的模板(特别是I/O模板)损坏造成的故障。这类故障一般比较明显且影响也是局部的,它们主要是由使用不当或使用时间较长,模板内元件老化所致。
      4、软件故障
      这类故障是软件本身所包含的错误所引起的,软件故障又可分为系统软件故障和应用软件故障。系统软件是DCS系统带来的,若设计考虑不周,在执行中一旦条件满足就会引发故障,造成停机或死机等现象。此类故障并不常见。应用软件是用户自己编定的。在实际工程应用中,由于应用软件工作复杂,工作量大,因此软件错误几乎难以避免,这就要求在DCS系统调试及试运行中十分认真,及时发现并解决。
      5、操作、使用不当造成故障
      在实际运行操作中,有时会出现DCS系统某功能不能使用或某控制不封不能正常工作,但实际上DCS系统并没有毛病,而是操作人员操作不熟练或操作错误所引起的。这对于初次使用DCS系统的操作工较为常见。

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来源:工控备件
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