7、过程通道故障
过程通道出现最多是卡件故障或就地总线故障。一种原因是卡件本身厂时间工作，元器件老化或损坏；另外，因外部信号接地或强点信号串入卡件也会导致通道故障。现在一般卡件本身都采取了良好的隔离措施，一般情况下不会导致故障的扩大，但此类故障一旦出现，则直接造成过程控制或监控功能的不正常。所以要及时查明故障原因，及时进行更换卡件。
一次原件或控制设备出现故障有时不能直接被操作员发现，只有当参数异常或报警时，方引起注意。控制处理机（过程处理机）故障一般会立即产生报警，引起操作员注意。现在控制处理机基本上全是采用1：1冗余配置，其中一台发生故障不会引起严重后果，但应立即处理故障的机器。在处理过程中，绝对不可误动正常的处理机，否则会发生严重的后果。
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Bently Nevada Dual Thrust Monitor 7200 series
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