Log data
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⟩ Log data

Log data

Log data to review the tag values of a process in a system. A data log is a collection of data values from specified tags. Data logs are exported from the HMI device to an external device such as an SD card or an USB storage device. Exported data logs are contained in a .zip file. The .zip file contains a .csv file for each data log. Data logs are exported through an event that triggers an action that then exports the data log for viewing on a computer.
TIP:
Data logs contain tag values from all controllers in a project.
Use a data log to:
  • View historical data for a specific duration.
  • Collect tag values at a specified sample rate.
  • Identify data patterns in a system.
  • Troubleshoot a system.
  • Provide data for audits.
A data log automatically records data values in the background on an HMI device when a
View Designer
 project with a configured data log is running. Record the values of up to 250 tags in a data log. Each project can contain up to three data logs, however the a total number of tags per project is still 250 across the three data logs. Log data at a specific sample rate for a specified duration.
To view the tag values collected by the data log, export the data log to a .zip file on an USB storage device or SD card and then view the data log on a computer. To view the values of tags being logged on the HMI device, add the tags to a trend chart.
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