The Log Viewer widget can be used to display the contents of a file in on the HMI screen.
After placing the Log Viewer widget on the screen, double-click it to open its properties window as illustrated below. In the properties window, specify the path of the file to display.
Storage Card is the root of the SD card from within the HMI.
The Log Viewer will display the contents of the file.
Create a global timer event with an associated Action to log to a file every 15 seconds.
Set the path of the file to log to and use the Text Builder to specify the text to write.
Add a Log Viewer widget to the screen.
Double click the Log Viewer widget to open its properties window and specify the path of the file to read from.