四方输出表决电路对于所有的关键信道给出多重冗余,保证了安全和最大的利用率。双通道输出模件给出刚刚足够的冗余度以保证安全运行。双重化模件更适合于低成本比最大利用率更重要的关键安全场合。
每种数字输出模件均可对每点进行专门的输出表决器诊断(OVD)。一般而言,在OVD执行过程中每一个点的状态被逐点保存在输出驱动器上。在模件上的反馈控制回路允许每个微处理器读出此点的输出值,以决定在输出电路内是否存在有潜在的故障。(对于那些任何跃变时间宽度都不能容忍的现场装置,在AC和DC电压数字输出模件上的OVD都可以被禁止)。
监督型数字输出模件同时具有电压的和电流的反馈,具备在励磁和非励磁的工作状态下故障的完全覆盖。此外,监督型数字输出模件还能对回路进行连续校核,验证是否有现场负载存在。现场负载丢失或线路短路时,在模件上有信号指示。
DC电压数数字输出模件是专门设计来控制那些现场设备可能长期地保持于一种状态。DC电压数字输出模件的OVD诊断能确保完全的故障覆盖率,即使各点的被命令状态从不改变。在这种模件上,一般只在OVD执行期间输出信号发生跃变,但被保证低于2毫秒(标准的是500微秒),并且对绝大多数现场设备是没有影响的。
AC电压数字输出模件上,采用OVD诊断出故障的开关将会使用权输出信号跃进变为最大半个AC周期的反状态,这种变化不会对现场设备造成影响。一旦故障被检测出来,模件就不再继续进行OVD。在AC电压数字输出模件上的每个点都需要周期性的在ON在OFF状态两者上循环,以保证100%的故障覆盖率。
继电器输出(RO)模件是一种非三重化的模件,被用于非关键性的点上,这些点不能和“high-side”固态输出开关兼容。一个例子就是与信号指示装置面板的接口连接。继电器输出模件从三条分电路的对应的主处理器上接收输出信号。三组信号然后进行表决,被表决出的数据被用以驱动32个各自独立的继电器。每个输出有一反馈电路,它检验每个继电器的运行而不管有没有负载存在。不断定进行着的诊断测试着RO模件的运行状态,该模件并不准备被用在关键的点上或现场负载的上。
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