Single loop control system
First Claim
1. A microprocessor based single loop control instrument comprising:
- a first microprocessor,a read only memory in which is stored an operating program for said first microprocessor, said program containing machine instructions sufficient to perform a single loop control PID algorithm using the tuning parameters KP, KI and KD which produces an output signal in response to at least a process variable and a setpoint and sufficient to operate said control instrument as one of at least two different types of controllers each having at least two operating modes,a random access memory,means for entering into said random access memory at least two sets of said tuning parameters and at least one breakpoint,means for selecting a tuning parameter from one set of tuning parameters or the other in accordance with whether a tuning variable is greater or lesser than said breakpoint,means for causing said control instrument to operate as one of the controller types provided for by the program stored in said read only memory, andmeans for selecting the mode of operation of the controller selected by said causing means.
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Accused Products
Abstract
A microprocessor based single loop control instrument is described which can operate as any one of several different types of controllers, each of which can provide two or more different modes of operation. The control instrument comprises a microprocessor, a read only memory in which is stored the operating program for the control instrument, means for causing the control instrument to operate as one of the types of controllers provided for by a program stored in the read only memory and means for selecting the mode of operation of the controller. Further, in accordance with the invention, the control instrument is supplied with a control panel controlled by a second microprocessor and connected to the first microprocessor by a communication bus. The second microprocessor controls a bar graph display for displaying at least one signal related to the operation of the control instrument as well as means for selecting the signal that is displayed. Advantageously, the control panel also mounts switch means for selecting the mode of operation of the controller. Also in accordance with the invention, the control instrument can be configured by a keyboard/display which permits the selection of numerous processing options in the execution of the control algorithm.
73 Citations
12 Claims
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1. A microprocessor based single loop control instrument comprising:
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a first microprocessor, a read only memory in which is stored an operating program for said first microprocessor, said program containing machine instructions sufficient to perform a single loop control PID algorithm using the tuning parameters KP, KI and KD which produces an output signal in response to at least a process variable and a setpoint and sufficient to operate said control instrument as one of at least two different types of controllers each having at least two operating modes, a random access memory, means for entering into said random access memory at least two sets of said tuning parameters and at least one breakpoint, means for selecting a tuning parameter from one set of tuning parameters or the other in accordance with whether a tuning variable is greater or lesser than said breakpoint, means for causing said control instrument to operate as one of the controller types provided for by the program stored in said read only memory, and means for selecting the mode of operation of the controller selected by said causing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A microprocesor based single loop control instrument comprising:
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a first microprocessor, a read only memory in which is stored an operating program for said first microprocessor, said program containing machine instructions sufficient to perform a single loop control PID algorithm using the tuning parameters KP, KI and KD which produces an output signal in response to at least a process variable and a setpoint and sufficient to operate said control instrument as one of at least two different types of controllers each having at least two operating modes, a random access memory, means for entering into said random access memory at least two sets of said tuning parameters and at least one breakpoint, means for selecting a tuning parameter from one set of tuning parameters or the other in accordance with whether a tuning variable is greater or lesser than said breakpoint, means for causing said control instrument to operate as one of the controller types provided for by the program stored in said read only memory, a communication bus connected to said first microprocessor, and a control panel comprising; a second microprocessor connected to said communication bus, a bar graph display controlled by said second microprocessor for displaying at least one signal related to the operation of said control instrument, means for selecting the mode of operation of the controller selected by said causing means, and means for selecting at least one of the signals displayed by said bar graph display. - View Dependent Claims (10)
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11. A microprocessor based single loop control instrument comprising:
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a first microprocessor, a read only memory in which is stored an operating program for said first microprocessor, said program containing machine instructions sufficient to perform a single loop control PID algorithm using the tuning parameters KP, KI and KD which produces an output signal in response to at least a process variable and a setpoint, a random access memory, means for entering into said random access memory at least two sets of said tuning parameters and at least one breakpoint, and means for selecting a tuning parameter from one set of tuning parameters or the other in accordance with whether a tuning variable is greater or lesser than said breakpoint. - View Dependent Claims (12)
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Specification