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 Machine control system

Details
Inventors: Boytor, Samuel G.; Jurs, Jeffry W.;
Assignee: F. J. Littell Machine Company (Chicago, IL)
Primary Examiner: Ruggiero; Joseph
Assistant Examiner:
Attorney, Agent or Firm: Willian Brinks Olds Hofer Gilson & Lione Ltd.

A machine control system includes a CRT on which a five bit screen image code is displayed, indicative of the particular screen image being displayed. Five sensors are mounted such that each senses a respective one of the code regions of the screen image code and generates a respective sensor signal. A controller compares the sensor signals with the screen image code for a commanded one of the screen images and indicates any disparity therebetween. In this way, a positive check is provided that the display screen actually displays the intended one of the image screens, and that the screen is in fact functional. In addition, a plurality of pushbuttons are provided which operate in two separate modes. In the first mode the pushbuttons provide programming inputs to the controller and in the second mode the pushbuttons act to control the machine directly via an alternate device, bypassing the controller.

DETAILED DESCRIPTION According to a first feature of this invention, a machine control system of the type described above is provided with means for generating a plurality of screen image codes, each comprising a plurality of code regions, and each included in a respective one of the screen images such that the screen image and the respective screen image code are displayed on the display screen simultaneously.
A plurality of sensors are positioned such that each senses a respective one of the code regions and generates a respective sensor signal indicative of the sensed code region.
Finally, means are provided for comparing the sensor signals with the screen image code for a displayed one of the screen images and for indicating any disparity.
The generating means, the sensors, and the comparing means cooperate to provide a positive check that the intended ones of the screen images are in fact displayed on the display screen.
In this way, potential problems possibly arising from display screen failures are substantially eliminated.
By positively checking that the displayed image screen on the display screen is the intended image screen, failures such as a failure of the display screen or a failure to display an intended one of the image screens or degeneration of integrity of the screens are prevented from resulting in operation of the machine.
According to a second feature of this invention, the machine control system is provided with an array of switches mounted on a front panel in physical alignment with respective label regions of the screen images.
A mode control switch is provided having a set of common poles, each connected with a respective one of the switches.
The mode control switch also includes a set of first output lines and a set of second output lines.
The mode control switch operates to interconnect each of the switches with a respective one of the first output lines when in a first state and to interconnect each of the switches with a respective one of the second output lines when in a second state


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