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Recording Data and Displaying as a Trend

Data recording

You can define project variables and/or device parameters whose values are recorded over time. The display of the recorded data is decoupled from the recording in the trend element.

NOTICE

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NOTICE

Timeout for trend recording

During a trend recording, it can happen that the application task triggers a timeout that is caught with an exception when transitioning from “Running” to “Stop”. Causes can be that file operations with the SQLite database are taking too long or that too many variables are being recorded. This usually happens on a target device with weak performance.

You can avoid the occurrence of an exception:

  • Configure the trend recording with less memory demand so that the amount of data that is stored is adapted to the target system.

  • Reduce the number of variables.

  • Configuring a Recording
  • Displaying Data Graphs with a Trend Element