System and method for detecting an abnormal situation associated with a process gain of a control loop

A process gain and control loop technology, applied in general control systems, test/monitoring control systems, control/regulation systems, etc., can solve problems such as device damage, raw material waste, and unexpected shutdowns

Active Publication Date: 2007-05-23
FISHER-ROSEMOUNT SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Once a problem is identified, maintenance personnel may need to order parts and schedule maintenance procedures, all of which result in a significant amount of time between when the problem occurs and when it is corrected, during which time the processing plant operates at normal and plant speeds. In abnormal conditions associated with non-optimal operation
[0012] Moreover, many processing plants may have experienced abnormal conditions that caused a lot of cost o...

Method used

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  • System and method for detecting an abnormal situation associated with a process gain of a control loop
  • System and method for detecting an abnormal situation associated with a process gain of a control loop
  • System and method for detecting an abnormal situation associated with a process gain of a control loop

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Embodiment Construction

[0047] Referring now to FIG. 1 , an exemplary process plant 10 in which an abnormal condition prevention system may be implemented includes several control and maintenance systems interconnected with support devices by one or more communication networks. Specifically, process plant 10 of FIG. 1 includes one or more process control systems 12 and 14 . Process control system 12 may be a conventional process control system, such as a PROVOX or RS3 system, or any other control system that includes an operator interface 12A, which in turn is coupled to a controller 12B and an input / output (I / O O) card 12C, which in turn is coupled to various field devices, such as analog and High Speed ​​Addressable Remote Transducer (HART) field devices 15. Process control system 14, which may be a distributed process control system, includes one or more operator interfaces 14A coupled to one or more distributed controllers 14B via a bus, such as an Ethernet bus. Controller 14B may be, for exampl...

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Abstract

In a method for monitoring a control loop in a process plant, process gain data associated with a control loop may be collected. The collected process gain data may be used to determine an expected process gain behavior. For example, expected values of a process variable for given values of a load variable may be determined. As another example, expected changes in a process variable for given changes in a load variable may be determined. Then, during operation of the control loop, the process gain may be monitored. If the monitored process gain substantially deviates from the expected behavior, this may indicate an abnormal situation associated with the control loop.

Description

[0001] References to related applications [0002] This application claims the benefit of US Provisional Patent Application No. 60 / 578,957, filed June 12, 2004, which is incorporated by reference in its entirety into this application for all purposes. Background technique [0003] Process control systems, such as those used in chemical, petroleum, or other processes, typically include one or more centralized or distributed process controllers connected via an analog, digital, or hybrid bus , is communicatively coupled with at least one host or operator workstation and one or more process control and instrumentation devices such as field devices. Field devices, such as valves, valve controllers, switches, transmitters, and sensors (such as temperature sensors, pressure sensors, and flow rate sensors), are placed in the process plant loop environment and perform various functions in the process, such as switching valves, measure process parameters, increase or decrease fluid fl...

Claims

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0254C10G11/187G05B13/024
Inventor 小约瑟夫·H·夏普
Owner FISHER-ROSEMOUNT SYST INC
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