详细介绍: 每种数字输出模块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。在模块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电压数字输出模块上的OVD都可以被禁止)。
监督型数字输出模块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,监督型数字输出模块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,在模块上有信号指示。
DC电压数字输出模块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电压数字输出模块的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。在这种模块上,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电压数字输出模块上,采用OVD诊断出故障的开关将会使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,模块就不再继续进行OVD。在AC电压数字输出模块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。
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