Ams trex™ Device Communicator

5.13
Saving measurements to a log file
The Fieldbus Diagnostics application lets you save measurements to a log file, transfer the
log file from the Trex unit to a PC, open the log file in a spreadsheet application, and chart
the data to identify sporadic events or trends where the fieldbus segment is degrading.
You can log many measurements over 24 hours to catch a sporadic issue, or log
measurements once a year to discover long-term changes in the performance of the
fieldbus segment.
File type
The measurements are saved to a comma-separated values (.csv) log file on the Trex unit,
so you can use several different spreadsheet programs, including Microsoft
®
Excel, on the
PC to analyze and chart the data at a later time. You cannot view the contents of the log
file from the Trex unit.
User Guide 
Fieldbus Diagnostics application
September 2021
User Guide 
169

---

Creating trends/reports
When you enable logging, the Fieldbus Diagnostics application displays a screen of
settings you can set for the log files. To create long-term trends/reports, set the 
Save
option to 
Append
and use the same log file for every measurement period. This allows the
Fieldbus Diagnostics application to save multiple sets of measurements to one file, rather
than overwriting the data each time you enable logging.
Related information
Enable or disable logging
Save measurements to an existing log file
5.13.1
Log file overview
The Fieldbus Diagnostics application can save measurements to a log file with the .csv
(comma-separated values) file extension. The log file lists the information you entered
when you enabled logging, including the fieldbus segment name, the name of the user
taking the measurements, and the location of the measurements.
Note
As a best practice, create a new log file for each fieldbus segment and connection point
you are monitoring, or ensure you update the segment name and measurement location
fields each time you collect data.