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unnikrisvp1-Visitor
1-Visitor
May 30, 2018 6:31 AM UTC
Question

How to model association pattern using Things

I want to implement the below structure in Thingworx.

Device

    - List<Axis> {A1, A2}

    - List<Rotor> {R1, R2, R3}

Axis

    - Position (Number)

    - Temperature (Number)

Rotor

    - Speed (Number)

There is an option to provide a ThingName as a property, however List is not supported.

 

Currently I have modeled the above structure using Infotables.

Device

    - AxisPosition Infotable  eg: {A1X - 26, A1Y - 67, A2X - 56, A2Y - 0}

    - AxisTemperature Infotable eg: {A1 - 156, A2 - 167}

    - RotorSpeed Infotable {R1 - 34, R2 - 45, R3 - 50}

Each infotable will have multiple rows of axis/rotor and position/temp/speed values. And the infotable properties are logged to a ValueStream.

 

However this structure cannot be mapped to a Time series chart, as the ValueStream timestamp is associated with the Device and the chart don't support infotable on any axis.

If List could have been supported, I could have retrieved all the axis/rotor Things of a particular device and then mapped individual properties to the time series chart

 

Can you please suggest how this structure can be alternatively modeled, so that it can be used in a TimeSeriesChart.

 

 

 

7 replies

PaiChung22-Sapphire I
22-Sapphire I
May 30, 2018 11:59 AM UTC

Looks like you are fairly well on your way.

to get the data to chart with your setup, you will need to use the DataChange and Subscription event/subscription to create a service to log the data into a regular stream.

Then of course create a service to pull it out to display properly.

A slightly longer way to do it is to model each as a Thing and relate them to each other in a Network. Which in this use case may not make as much sense.

Finally you could break all of the items out in separate properties and then you can leverage ValueStream

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    unnikrisvp1-VisitorAuthor
    1-Visitor
    May 30, 2018 1:11 PM UTC

    Thanks Pai.

    I will have a look on creating a custom service logic to extract the require data using the event and subscriptions. Do you have any code excerpts which depict how to log the data into a regular stream.

    I am also interested in checking the Network solution. Do you have any references for the same.

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    PaiChung22-Sapphire I
    22-Sapphire I
    May 30, 2018 1:28 PM UTC

    If you have access to our Fundamentals course on precision LMS there are examples there.

    In the Snippets if you go to datatable/stream/blog/wiki there is an AddStreamEntry example

    Networks you should be able to figure out fairly easily, comes with a ton of additional useful services as well.

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