====Pivot Example: Movement Across Assets====

There are a number of different applications where machines move between assets - filling, loading, extracting or simply moving past other pieces of equipment.

It's not unusual to know what values are //as you pass// the assets or key milestones on their path, or to know the difference in performance across different parts of the line.

In this case, we have a loader that moves on a track between several different product bins, filling them. We'd like to see some details about its activity. 

===Available Information===

^Asset^Property^Desc^
|Loader|Odometry|The position of your machine|
|Loader|Speed|The speed the machine is moving|
|Loader|Weight|The tonnage of product the machine is carrying|

===Initial Layout===

{{start_pivot.png}}

To begin with, we have one [[pivot_pivot|Pivot]] node named //Pivot On//, and one [[pivot_output|Pivot Output]] node named //MinMaxAvg//

These are both fed by [[ardi_point|ARDI Point]] nodes, bringing data in from ARDI asset properties.

===Step 1: Choose the Pivot===

Our first step is to choose //what we are going to pivot on//.

In our particular application, our loader is filling up a series of bins. Each bin is 3.5m wide.

Our pivot should be the number of the bin we are filling. We can figure this out mathematically by...

   * Getting the position of our loader (in meters),
   * Dividing that by the size of each bin (3.5),
   * Removing the decimal points

{{example_pivot_movement.png}}

===Step 2: Add Measurements===

Next, we can choose the measurement we're interested in. Choosing //speed// would be simple, but we're more interested in knowing how much product we've been feeding into the bins.

At the moment, we've got a weight sensor in our loader, but none in the bins. Pivot analytics have the [[pivot_diff|Difference]] node, which is used to record the difference between the value when the asset //entered// the pivot compared to when it //left// the pivot.

  * Right-click the MinMaxAvg node and choose **Delete**
  * Right-click in the empty space and choose **Add Node**, **Report**, **Difference**.
  * Right-click the new node, choose **Title** and call it 'Weight'

If you feed the //weight// of the loader into the Difference node, you'll then report on how the //weight changed// at //each hopper//.

{{example_pivot_diff.png}}

===Step 3: Ignore Filling the Loader===

If we were only interested in filling the //hoppers//, we can use the [[pivot_ignore|Ignore]] node and choose when we should simply ignore data.

These rules can include...

  * Ignore any time when the loader is in the loading bay (a position of '0').
  * Only use times when the weight in the loader //drops// rather than //rising//.

{{example_pivot_ignore.png}}

===Analytic Complete===

We can now see how much each of the bins were filled with, and when.

{{example_pivot_movefinal.png}}