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CRT operation apparatus

  • US 5,481,250 A
  • Filed: 05/01/1995
  • Issued: 01/02/1996
  • Est. Priority Date: 07/18/1989
  • Status: Expired due to Term
First Claim
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1. A CRT operation apparatus for controlling a plant having terminal units, said CRT operation apparatus comprising:

  • CRT display means for displaying a system image of the plant, including icons indicating said terminal units and for selecting one of said terminal units by using said icons;

    high-rank controller means, connected to said CRT display means, for supplying operation commands to one of said terminal units selected by said CRT display means;

    low-rank controller means, connected to said terminal units, for controlling said terminal units;

    network means for connecting said high-rank controller means and said low-rank controller means;

    central control means, connected to said network means and having a manual operating member, for supplying operation commands to said terminal units by using the manual operating member;

    first detecting means for detecting whether or not one of said terminal units selected by said CRT display means is in trouble;

    second detecting means for detecting whether or not the operation command supplied from said CRT means is inconsistent with the operation command supplied from said central control means;

    means, when one of said terminal units is selected by said CRT display means, for supplying a first abnormal-signal to said CRT display means if said first detecting means detects that the terminal unit is in trouble, a second abnormal signal to said CRT display means if said second detecting means detects that the operation command supplied from said CRT means is inconsistent with the operation command supplied from said central control means, and a use-permission signal to said display means if said second detecting means detects that the operation command supplied from said CRT means is not inconsistent with the operation command supplied from said central control means and said first detecting means detects that the terminal unit is not in trouble.

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