| 摘要 |
A control system incorporates components that automatically switch information sources in response to actual or potential degradation of information generated by them. Thus, a control system has first and second control components that generate first and second "source" signals, respectively, representing substantially identical or related process control variables. A third control component, which normally processes the first source signal, responds to actual or potential degradation of that signal for processing the second source signal in lieu of the first.
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