Control Charts

It would be awesome if Canary could add a control chart to your existing lineup of controls in Axiom!

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  • Thanks Todd.  Would the limits be user defined or pulled from a tag property in your use case?  Also, in your use case, would this chart be used only as a historic display or also need to display data in real time or 'live'?  If real time, how often would the Average need to update?

  • This behavior can in principle be emulated partially by using the upper and lower limits of a trend right?

    • Roald Ruiter You can set high and low limits on a trend. They are either fixed or linked to another tag that is on the chart. You can also add static lines to a chart that are fixed. This is all done through the 'Edit Trends' menu.

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  • Control charts like this are definitely something a number of the plants in my company are interested in as well. I'm working on learning more about this, but I think the idea would be to calculate the UCL, Mean, and LCL values based on logged data and be able to plot and alarm off that.

    To complicate things though, I think there would be different UCL/Mean/LCL values based on what material they were producing at the time. For example, from 10-12 today, I'm running material ABC on machine 1 so I want my control chart to be an x days look back at values for this machine and material and I want to see when I'm outside where I should be. We could assume that the "key item" for the chart (e.g. material) would be a tag that Canary would have. 

    I have more info on this and can elaborate further in the future if that would be helpful. 

    I think the attached from a previous discussion that Jeff and I had may also help here.  

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