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How to Apply OPC UA Data Transformations

Data Transformations allow a user to apply a calculation to a tag, such as a measurement conversion, before it gets stored in the Historian. Data Transformations can be used in some situations to circumvent creating a tag in the calculation server, which keeps the user from purchasing an additional tag license.

  1. Open the Canary Admin application, select the 'OPC Collector' tile, and select 'Configuration'.

  2. Select an existing logging session or create a new one.

  3. Find which tag(s) must undergo a data transformation in the logging session.

  4. Select the tag(s)' respective cell in the 'Transform' column of the trends grid.

  5. Type the expression in the 'Transform' field under the 'Tag Settings' section. Tag values are represented by 'x'image.png

The following mathematical operators can be used when typing the expression.

image.png

  1. Select 'Apply' in the upper right hand corner of the page.

    1. After clicking apply, the OPC Collector issues a warning that a small hole will be created in the data while changes apply. Select 'OK'.

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