Digital controller
First Claim
Patent Images
1. A process controller comprising:
- process variable signal conversion means for receiving and digitizing an analog process variable input signal, and includinga variable frequency generator frequency modulated in response to an analog voltage,timing means for providing a strobe signal after a prescribed period of time, andfrequency counting means connected to said timing means and to said variable frequency generator to provide said process variable signal in digitized form as the output of said counter upon the occurrence of each strobe signal,set point control signal generating means for receiving manual inputs to generate a plurality of digital control signals,central processor means for receiving said digitized control signals and said digitized process variable input signal and for generating an error of correction output signal responsive thereto,digital display means for selectively displaying digital representations of said manually generated control signals and said process variable signal, andanalog display means for displaying said process variable input signal and said set point control signal.
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Abstract
A digital controller is provided for a process control system having a centralized display of process variables and parameters, which allows an operator to alter some or all of the parameters. The controller includes both a digital display and an analog display. The digital display allows instant response to inquiries concerning a wide number of operating prameters and conditions, while the analog display provides a continuous display of the major variables and parameters.
67 Citations
41 Claims
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1. A process controller comprising:
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process variable signal conversion means for receiving and digitizing an analog process variable input signal, and including a variable frequency generator frequency modulated in response to an analog voltage, timing means for providing a strobe signal after a prescribed period of time, and frequency counting means connected to said timing means and to said variable frequency generator to provide said process variable signal in digitized form as the output of said counter upon the occurrence of each strobe signal, set point control signal generating means for receiving manual inputs to generate a plurality of digital control signals, central processor means for receiving said digitized control signals and said digitized process variable input signal and for generating an error of correction output signal responsive thereto, digital display means for selectively displaying digital representations of said manually generated control signals and said process variable signal, and analog display means for displaying said process variable input signal and said set point control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process controller comprising:
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a central processor for receiving a digitized process variable input signal and a digitized process control input signal and for generating a digital error correction output signal to regulate a process variable in accordance with said process control input signal, memory means for storing said process control input signal in digitized form, means for interfacing manually provided operating control information with said memory means to produce said digitized process control input signal, means for displaying digital representations of selected information and signals from said memory means, means for displaying analog representations of said process control input signal and said process variable input signal, and means for manually providing operating parameter information to said means for interfacing wherein base values of said operating parameters are established in said memory means, and means for overiding said means for manually providing operating parameters to restore said base values to operate to produce said error correction output signal.
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11. A processs controller comprising:
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a central processor for receiving a digitized process variable input signal and a digitized process control input signal and for generating a digital error correction output signal to regulate a process variable in accordance with said process control input signal by combining at least one component from among a proportional function component of changes in said process variable input signal, and integral function component of the difference input between said process variable input signal and said process control input signal, and a differential function component of changes in said process variable input signal, memory means for storing said process control input signal in digitized form, means for interfacing manually provided operating control information with said memory means to produce said digitized process control input signal, means for displaying digital representations of selected information and signals from said memory means, and means for displaying analog representations of said process control input signal and said process variable input signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification