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    Monitoring and control system and method
    2.
    发明授权
    Monitoring and control system and method 失效
    监控系统及方法

    公开(公告)号：US5644487A

    公开(公告)日：1997-07-01

    申请号：US138848

    申请日：1993-10-19

    申请人： Stephen B. Duff ,  Jack S. Paltenstein

    发明人： Stephen B. Duff ,  Jack S. Paltenstein

    IPC分类号： G05B19/05 ,  G05B23/02 ,  G05B11/01

    CPC分类号： G05B19/056 ,  G05B23/0216 ,  G05B2219/13015 ,  G05B2219/13037 ,  G05B2219/13108

    摘要： In a distributed process-control system, program-controlled apparatus is provided for permitting an operator to control the mode of a Sequential Function Chart (SFC) to place the Chart in any of five different modes as a convenience in monitoring, editing and/or changing the SFC program. These modes are: OFF mode, for temporarily disabling operation of the SFC Chart, an AUTO mode which allows the SFC program and Chart to run as configured, a HOLD mode which freezes the chart in its current state, a MANUAL mode enabling the operator to force the Chart to an operator-selected step while the output of the current step is maintained active, and a TRACE mode enabling the operator to view the steps in the Chart sequentially, and to force the steps without executing them.

    摘要翻译： 在分布式处理控制系统中，提供了程序控制装置，用于允许操作者控制顺序功能图（SFC）的模式，以将图表放置在五种不同模式中的任何一种中，以便于监视，编辑和/或 更改SFC程序。 这些模式为：OFF模式，用于临时禁用SFC图表的操作，允许SFC程序和图表以组态方式运行的AUTO模式，在当前状态下冻结图表的HOLD模式，使操作员能够 在当前步骤的输出保持活动状态下强制图表到操作员选择的步骤，以及TRACE模式，使操作员能够顺序地查看图表中的步骤，并强制执行这些步骤。

    Electrical fault detector in remote systems using a saturable core
    3.
    发明授权
    Electrical fault detector in remote systems using a saturable core 失效
    使用可饱和核心的远程系统中的电气故障检测器

    公开(公告)号：US5229725A

    公开(公告)日：1993-07-20

    申请号：US864517

    申请日：1992-04-07

    申请人： William J. Spaeder ,  John C. Grebe

    发明人： William J. Spaeder ,  John C. Grebe

    IPC分类号： G01R31/02 ,  G01R19/10 ,  G01R19/255 ,  G01R31/28 ,  H04B3/46 ,  H04Q9/00

    CPC分类号： G01R19/255 ,  G01R19/10

    摘要： Imbalances between currents to and from a remote point are detected by passing the outgoing currents and the return current through different, oppositely-oriented coils on a saturable core, and an excitation current is applied to another coil in the same core sufficient to drive the core into saturation in at least one direction. When the outgoing and return currents are the same, the excitation produces successive voltage pulses of the same durations, as measured by an up-down counter; if an imbalance is present, the remainder in the up-down counter shows this. To detect excessively high imbalances, which might place the core always in saturation, another counter preferably senses the sum of the widths of successive pulses, and indicates an imbalance if this sum falls below a preselected threshold.