Search the Community
Showing results for tags 'grade transition'.
Found 2 results
In Seeq's May 25 Webinar, Product Run and Grade Transition Analytics, we received a lot of requests during the Q&A asking to share more details about how the grade transition capsules were created and how they were used to build the histograms presented. So here is your step-by-step guide to building the condition that will make everything else possible! Defining your transition condition Step 1: Identifying product campaigns The "condition with properties" tool under "identify" can transform a string signal of product or grade code into a single capsule per campaign. In older versions of Seeq this same outcome can be achieved in formula using $gradeCodeStringSignal.toCondition('grade') Note: if you don't have a signal representing grade code, you're not out of luck, you can make one! Follow the general methodology here to search for set point ranges associated with different grades or combinations of set points that indicate a particular grade is being produced. Step 2: Create the transition condition encoded with the starting and ending product as a capsule property $t = $c.shrink(2min).inverse() //2 min is an arbitrary small amound of time to enable the inverse function to //capture gaps in the campaigns $t.removelongerthan(5min) // 5min is an arbitrarily small amount of time to bound calc (that is >2min * 2) .transform($capsule -> $capsule.setProperty('Transition Type', $pt.resample(1min).toscalars($capsule).first() + '-->' + $pt.resample(1min).toscalars($capsule).last())) .shrink(2min) Step 3: Identify time period before the transition Step 4: Identify time period after the transition Step 5: Optional - for display purposes only - Show the potential transition timeline (helpful for chain view visualizations) Step 6: Create a condition for on-spec data Here we use value search against spec limit signals. If you don't have spec limit signals already in Seeq, you can use the splice method discussed in the post linked in step 1 to define them in Seeq. Step 7: Combine condition for on-spec data and condition for time period before the transition Step 8: Combine condition for on-spec data and condition for time period after the transition Step 9: Join the end of the condition for on-spec before the transition to the start of the condition for on-spec after the transition to identify the full transition duration Your condition for product transitions is now officially ready for use in downstream applications/calculations! Working with your transition condition Option 1: Calculate and display the transition duration Use Signal from Condition to calculate the duration. The duration timestamp will generate a visual where the length of the line is proportional to the length of the transition. Increasing the line width in the customize panel will display the transition duration KPI in a gantt-like view. Option 2: Build some histograms Summarize a count of capsules like the number of times each distinct transition type occurred within the date range. Summarize a signal during each unique transition type, like the max/min/average transition duration for a distinct transition type. Option 3: Generate some summary tables Switch to the table view and toggle "condition" to view each transition as a row in the table with key metrics like total duration and viscosity delta between the two grades. Add the "transition type" property from the "columns" selector. If you run into hiccups using this methodology on your data and would like assistance from a Seeq or partner analytics engineer please take advantage of our support portal and daily office hours.
Use Case: Users are often interested in identifying when a particular process is operating in a specific mode, or when it is in transition between modes. When looking at these transition periods, you may want to know what the modes of operation were immediately before and after the transition. If you can assign the starting and ending modes during a transition period to each transition capsule, you can filter for specific types of transitions and get a better idea of what to expect during like transitions. Solution: For Versions R.21.0.43 + 1. Add a signal to your display that describes the mode of operation you are interested in. In this example I have added the Example Data > Cooling Tower 1 > Area A > Compressor Stage string signal. Other signals that this use case applies to may include: production grade code, equipment operating mode, signal for step in a sequential or batch process. 2. Next we can use Formula to create a new condition comprised of capsules each time our Compressor Stage signal changes value. These capsules will contain a new capsule property called 'StartModeEndMode' that represents the value of the compressor stage immediately before and immediately after the signal changed value, or transitioned. The formula syntax to achieve this is: //creates a condition for 1 minute of time encompassing 30 seconds on either side of a transition $Transition = $CompressorStage.toCondition().beforeStart(0.5min).afterStart(1min) //Assigns the mode on both sides of the step change to a concatenated string that is a property of the capsule. $Transition .transform( $cap -> $cap.setProperty('StartModeEndMode', $CompressorStage.toCondition() .toGroup($cap, CAPSULEBOUNDARY.INTERSECT) .reduce("", ($seq, $stepCap) -> $seq + $stepCap.getProperty('Value') //Changes the format of the stage names for more clear de-lineation as a property in the capsules pane. .replace('STAGE 1','-STAGE1-').replace('STAGE 2','-STAGE2-').replace('TRANSITION','-TRANSITION-').replace('OFF','-OFF-') ))) and the Output is: Note that we added the new property 'StartModeEndMode' to the Capsules Pane. 3. We can now filter this condition to look for specific transitions of interest. In this example, we are interested in every time our compressor went from a TRANSITION state to STAGE2. Use Formula and the filter() function with the following syntax to achieve this. //Create a new condition comprised only of capsules where the 'StartModeEndMode' property is equal to '-TRANSITION--STAGE2-' $ConditionCreatedInStep2.filter( $capsule -> $capsule.getProperty('StartModeEndMode').isEqualTo('-TRANSITION--STAGE2-')) and the Output is: 4. Now we are able to add other signals of interest to the display and switch to Capsule Time view to observe how those signals behave during these similar transition events.