( 论文 页数:18 字数:7224) 这里有三种类型的控制站，每个都可以通过数字式（NDCS03）或类似的(IISAC01)控制站和/或人工界面实现各站的可控性。这些控制站的类型包括基础型，层叠型和对比型。

基础站产生一个给定值(SP)并送给手/自动传输，以控制输出调节器在手动控制方式，设定值调节器在自动方式。层叠站提供一个和基础站相同的作用上加上了一个附加模式，就是允许外部输入信号<S2>控制设定值。

比例站提供基础站的全部功能，不同于级联站的是当处在比率站的时候，会以它的方式产生设定值。在比率模式下，外部信号<S2>乘一个比例调节因数来确定设定值的输出。当控制站设定在比例模式时，初始比例指针值由控制站计算出来维持当前设定值。在比例模式下，比例值代替设定值显示并可以被操作员调整以获得渴望的输出值。

控制器允许改变控制模式，设定值，比例值，还可以通过改变控制器的控制变量改变控制器的输出值。

输出值在启动时是可设置的。如果S16在DCS中被定义为0-7的数值，在SCA中被定义为0-63的数值，启动时就可以将输出值显示在DCS站或SCA站中。如果站中存在一个信息传诵失败，在启动时，控制输出量通过CO控制信号<S4>。

注释：协调控制器在40千波特时的有效站地址在1-63和100-163之间。
当模拟输出量坏质量时，相似的模拟输出量将会在自动旁路残生并将输出量送到控制模块。

There are three types of stations, each controllable through a digital (NDCS03) or analog (IISAC01) control station and/or a human system interface (HSI). The types include basic, cascade and ratio stations.

A basic station generates a set point (SP) and provides manual/ automatic transfers, control output adjustments in manual control mode, and set point adjustments in automatic control mode.

A cascade station provides the same functions as a basic station plus an additional mode that allows the set point to be controlled by external input signal <S2>.A ratio station provides the same functions as a basic station, but differs from the cascade station in its method of set point generation while in the ratio mode. The wild variable <S2> multiplied

by a ratio adjustment factor (ratio index) determines the set point output while in ratio mode. The initial ratio index value is calculated by the station to maintain the current set

point output value when the station is placed into the ratio mode. While in the ratio mode, the ratio index value is displayed in place of the set point value and can be adjusted (ramped up or down) by the operator to obtain the desired set point output.

Station control allows changing the mode, set point, ratio index and control output of a control station by manipulating a control station element.

The control output (CO) value during startup is configurable. If S16 defines a DCS station (S16 equals zero through seven) or SAC station (S16 equals zero through 63), then the control output during startup tracks the displayed control output on the DCS station or SAC station. If a communication failure exists for the station (or S16 equals 255), then the control output tracks the CO track signal <S4> during startup.