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Method and apparatus for sequential control of analogue signals

  • US 4,821,167 A
  • Filed: 03/02/1987
  • Issued: 04/11/1989
  • Est. Priority Date: 03/02/1987
  • Status: Expired due to Fees
First Claim
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1. A method of process control wherein a continuous process is controlled by a digital control receiving sets of digital input signals and producing sets of digital output signals, the process being monitored and controlled by a plurality of analog process signals including analog input signals representing values of process parameters and analog output signals representing values of controllable process variables, the method comprising the steps of:

  • (a) repetitively producing, asynchronously with activity of the digital control, clock signal at a predetermined repetition rate;

    (b) translating the plurality of analog process signals between the continuous process and the digital control in response to the clock signal by executing the steps of;

    (i) periodically storing samples of a plurality of analog input signals;

    (ii) periodically producing a set of digital input signals in response to a selected stored analog input signal sample; and

    (iii) periodically storing an analog output signal in response to a set of digital output signals.

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