描述
一次元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不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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