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2001




Time Line Unveils Relationships For Optimal Control (November 2001)

Use ExperTune's new Time Line Analysis to help understand the relationships between the time of each component in the control loop. Each component should be at the appropriate time relative to other components. Correcting deficiencies in the time line will improve the performance of the loop.

For example, the sample interval should always be shorter than the dead time in the loop. If the sample interval is close to the dead time then shortening the sample interval will improve loop performance.

The software appropriately scales and plots these items on the time line:

  • Sample Interval
  • Filter Time
  • Derivative Time
  • Dead Time
  • Equivalent Dead Time
  • Integral Time
  • Relative Response Time

The software also performs time evaluations between items. A color coded message bar is shown between each comparison. ExperTune evaluates the following:

  • Sample Interval compared to Dead Time
  • PV Filter compared to Controller Derivative Time
  • Controller Derivative compared to Controller Integral Time
  • PV Filter compared to Dead Time or Equivalent Dead Time (if second order)

ExperTune creates a full report in Microsoft Word including the Time Line plot, all the items on it, and the comparison ratios. The report documents your loop for future records.

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ExperTune's New PlantTriage® Monitors and Prioritizes Loop Performance (September 2001)

PlantTriage identifies the areas in your plant where the greatest economic gains are possible. It pinpoints areas to work on that will yield the greatest economic return.

PlantTriage Assessor continually watches and analyzes the process for the areas that will make the greatest economic impact. The Assessor monitors and evaluates over 20 separate analytical measures for every loop in the plant. All of these measures are archived for historical trending of each performance measure. Any combination can be viewed if detailed analysis is desired. In addition all the performance measures are made available via OPC - so they can be made available to anyone, anytime, anywhere.

PlantTriage Notification reports via email with areas that will benefit the most economically from improvement. Optionally, PlantTriage can send a complete priority analysis report to have your plant watched from an outsourced engineering house.

PlantTriage Optimization Analysis includes the complete optimization power of the Advanced ExperTune PID Tuner/Analyzer so the user has the complete range of analysis tools to help optimize areas pinpointed by the PlantTriage Assessor.

PlantTriage Consultant, an expert system component of PlantTriage, the Consultant is designed by world-renowned process control expert Greg Shinskey. The Consultant diagnoses problems and recommends specific control strategies for improvement.

PlantTriage Prioritized Tasks lists assessments for a unit operation or pre-defined group in the order of greatest economic benefit.

PlantTriage Historian is a full featured data historian package specifically designed to make pinpointing process improvement opportunities easy. All process variables and performance measures are archived for detailed viewing at any time in the future. PlantTriage obtains data from your process via OPC or directly from an installed OSI Software PI system.

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Relative Stability Index Allows Comparisons From Different Conditions (August 2001)

ExperTune's loop summary table now includes a stability index column. This lets you easily compare the relative stability of the PID tuning from several different sets of test data along with PID values, process model dead time, gain, lag time, RRT and Quality of fit.

The Relative Stability Index helps the user find the best test data based on the conditions by comparing different stability indices. It also allows for comparing test data from a series of tests done under similar conditions.

The results for every piece of test data is easily added as a row to the Loop Summary table. The Loop Summary table summarizes all the results from each test. Each row of the table lists the model found, optimal PID parameters, quality of the data, response time of the loop, and now the relative stability index. Comparison of the stability indexes of each row allows for better choosing the row to use for PID tuning and loop modeling.

ExperTune's full suite of optimization tools make it easy to increase the efficiency of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multivariable, statistical, frequency response and loop tuning tools.

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Process Control Training via On-Line Web Presentations (June 2001)

ExperTune Inc has released a series of on-line training videos available at no-charge on the web. The videos are run using Microsoft's Media Player in your browser, so no special software is required to get the training. Simply click on the training you would like.

Topics covered are:

  • Comparison of Industrial PID Controller Algorithms
  • Ziegler-Nichols methods: Rules and Limitations
  • Loop Stability - The Other Half of the PID Tuning Story

Comparison of Industrial PID Controller Algorithms explains the differences in units and algorithms between different manufacturer's controllers. Every industrial PID controller is different and tuned differently. This video explains those differences.

Ziegler-Nichols methods gives the PID tuning rules developed by these icons of process control. The video also explains the limitations of their rules.

Loop Stability explains the trade-off between fast tuning and stability. Tune a control loop aggressively enough and it will oscillate. Time response is one side of the story. Robustness plots are the other.

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Optimize Any Control Loop via Self-Adaptive Connection Wizards (April 2001)

The greatest barrier to optimizing control loops is often getting analysis software connected to the loop. Now, ExperTune has made this easy for ANY controller.

Use ExperTune's optimization tools to increase the efficiency of your process. Use ExperTune software to fully optimize control loops in any industrial controller. ExperTune includes powerful valve testing and wear analysis, statistical and variability analysis, linearization for optimal production at all production rates, pH linearizer, power spectral density to uncover hidden cycles, loop simulation, modeling, robustness, multivariable, frequency response and PID loop tuning tools.

ExperTune includes an extensive list of setup wizards to get you connected to your controller. However, if there's not already a connection wizard in the list for your controller, ExperTune software automatically develops one for you the first time you connect to the controller.

Your first time connecting, answer the Wizard's detailed questions. When you have finished connecting your first loop, ExperTune will have created a Wizard making it super-easy to connect to more loops.

The wizards connect to your controller using your DDE or OPC server. DDE is Microsoft's Windows Dynamic Data Exchange built into 95,98, NT and 2000. OPC is Ole for Process Control. There are DDE or OPC servers for virtually all modern digital controllers.

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Siemens Moore to Distribute ExperTune Software (February 2001)

Siemens Moore Process Automation, Inc., announced that it has signed a formal contract with ExperTune® to distribute its software. ExperTune, an award-winning software package, is used to optimize process control applications. Siemens Moore will integrate the ExperTune software into its existing ProcessSuite® software offerings.

ExperTune consists of basic tools for analyzing and tuning PID loops, as well as advanced tools to analyze loop performance and valve dynamic behavior. "We are pleased to announce our relationship with ExperTune, the industry's leading tuning software company. We strategically selected this partnership with ExperTune due to their unique software which will allow our customers to further optimize their process by reducing energy use and increasing product consistency," stated Rich Dunbar, Vice President of the Siemens Moore Global Systems Business. ExperTune software will:

  • Reduce variability in product
  • Increase control loop performance
  • Provide preventive and predictive maintenance
  • Minimize raw material energy usage

"We're thrilled that through this agreement and co-development work, users will have easy access to powerful optimization tools, letting them get the most out of each and every control loop," said John Gerry, President of ExperTune, Inc.

ExperTune, located in Hartland, Wis., offers a full suite of optimization tools that make it easy to increase the efficiency of your process. ExperTune software analyzes and tunes PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multivariable, statistical and frequency response tools.

Headquartered in Spring House, Pa,, Siemens Moore Process Automation, Inc., is a global leader in providing innovative solutions to process automation challenges and is the operational center of Siemens' process automation business in North America. The company's solutions help increase plant safety and productivity, reduce time-to-market and improve product quality in industries such as chemical, pharmaceutical, biopharmaceutical, oil & gas, pulp & paper and refining.

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Dial-In Process Control Robustness (February 2001)

Everyone knows that adjusting PID tuning parameters adjusts the speed of response. More aggressive tuning gives faster response, but also makes the loop more sensitive to process changes. Now, with ExperTune, it's even easier to get the best tradeoff between tight tuning and robust tuning. You simply dial-in the sensitivity or robustness you want.

ExperTune's unique robustness plot shows the tradeoff between tuning and sensitivity to the process changing. Using your plant's data, ExperTune automatically generates the robustness plot for your industrial loop. The plot shows how the combination of changing process gain, process dead time, and PID tuning settings, effect the stability and robustness of your loop.

Drag the robustness line to set the sensitivity you want. ExperTune automatically re-calculates the PID tuning parameters to achieve the robustness you specify. ExperTune also simultaneously displays the loop's time response to an upset or setpoint change. This gives you instant feedback showing the tradeoff in loop performance to the robustness correction you make.

ExperTune creates a full report in Microsoft Word including the resulting robustness plot, compared to time response and all performance indices and loop diagnosis. The report documents your loop for future records.

ExperTune's full suite of optimization tools make it easy to increase the efficiency of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multivariable, statistical, frequency response and loop tuning tools.

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Software Shows Performance Tradeoffs (January 2001)

Optimizing control loops is a tradeoff between loop performance, robustness and valve wear. Now the ExperTune Performance Summary lets you see all these at a glance: performance increase, robustness increase, valve travel, and valve reversal indices.

Each index is a comparison of the current PID parameters and measurement filter compared to new values. The performance increase shows you how much better the loop will respond to upsets. The robustness increase compares the sensitivity to process changes. Reducing valve travel and reversals will decrease wear and increase the life of the valve.

ExperTune's Performance Summary lets you easily decide how to balance the tradeoffs of performance, robustness, and valve wear.

ExperTune's full suite of optimization tools make it easy to increase the efficiency of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multivariable, statistical and frequency response tools. ExperTune creates a full, customizable, report of the analysis in Microsoft Word.

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