Use data logging and the trend graphic object to chart how tag values change over time.
At run time, when the operator opens a graphic display containing a trend, the trend displays values from the data log file for the data log model that is running. The data log model specifies the data to collect in the data log file.
Use these editors to set up data logging:
As soon as the project starts running, it begins logging values to the data log file. When the file is full, the oldest data is deleted to make room for new data. The application supplies data from the log file to the trend object for the specified tags and time span.
Tip: |
The data log file is retained when an application is restarted after a shutdown or power loss. You can delete the log file from the run-time computer at project startup. |
Set up data logging (Setup tab)
Set up data logging (Paths tab)
Keywords: data logging, model