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| OF PREFERRED EMBODIMENTS With reference now to the drawing and more particularly FIG. 1 thereof, ... |
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| Cabinet for loudspeaker |
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| Loudspeaker structure |
| I claim: 1. An electro acoustical transducer structure, comprising; (a) a base enclosure of ... |
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| Stereo electroacoustical transducing |
| What is claimed is: 1. Stereo electroacoustical transducing apparatus comprising, dual-channel ... |
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| Multiple chamber loudspeaker system |
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| Speaker system |
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| Electric acoustic converter |
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| Mid-range loudspeaker assembly propagating forward and backward sound waves in phase |
| Accordingly, it is an object of the present invention to provide a loudspeaker which reduces ... |
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Method and apparatus for debugging and tuning a process control network having distributed control functions
| Details |
Inventors: Larson, Brent H.; Burns, Harry A.; Brown, Larry K.;
Assignee: Fisher Controls International, Inc. (Clayton, MO)
Primary Examiner: Gordon; Paul P.
Assistant Examiner: Patel; Ramesh
Attorney, Agent or Firm: Marshall, O'Toole, Gerstein, Murray & Borun
A system and method for debugging and tuning a process control network having distributed control functions implemented by a set of field devices communicatively linked over a bus includes an operational scheduler that schedules the execution of each of a number of process control functions and communication functions performed by the field devices to define a process control scheme and an indicator that indicates one or more process control scheme locations at which the process control scheme is to be automatically or conditionally interrupted to thereby enable debugging and/or tuning of the process control network. A controller interrupts execution of the process control scheme at the indicated flow locations, communicates process data to a user to display the current or a past state of the process to a user and waits for user input before continuing with operation of the process control scheme. In a tuning mode, the controller delivers data pertaining to a process parameter to a tuning device or to a user which determines a new tuning parameter, such as a gain, to be used within the process control scheme based on the process parameter data. |
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DETAILED DESCRIPTION The present invention is directed to a method of and an apparatus for debugging and tuning a process control network having distributed control functions.
In accordance with one aspect of the present invention, during the initialization and tuning of a process control network having distributed control functions, a method stops a process loop during execution and preserves process control information for display to a user.
Thereafter, when directed by the user, the method continues execution of the process control network to isolate system errors or "bugs.
" The method may also monitor and save control function parameters in real-time at loop execution speeds to provide a "trace" function which is useful in tuning or retuning the process control network.
In accordance with another aspect of the present invention, a method and apparatus receives requests to tune selected process control parameters, adjusts the parameters over a bus, and monitors input and output parameters of control functions within a process control loop in real-time to enable an operator to determine whether a process control loop having distributed control functions is tuned properly.
In accordance with a still further aspect of the present invention, a process control loop operating in a two-wire, two-way digital communication environment includes control logic for accessing a process control variable in real-time during execution of the process control loop and a memory that stores the variable.
The process control variable may be available locally to a device within the process control loop or peripherally to a host device connected or coupled to the process control loop.
In one embodiment, the process control loop may include a routine that defines one or more breakpoints and that directs the control loop to execute to the breakpoint, at which a specified event, condition or a program code execution address occurs The process control loop may also include a routine that is operative at the occurrence of a breakpoint or at some other flow-control location, to single-step through subsequent functional blocks of the process control scheme
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