Log File Overview - Emerson AMS Trex User Manual

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
PC to analyze and chart the data at a later time. You cannot view the contents of the log
file from the Trex unit.
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
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.
Automatically generated file names
You can enter a file name for the log file or have the Fieldbus Diagnostics application
generate one based on the device tag or the device ID of the host and devices found on the
fieldbus segment. You must tap the Go Online option before enabling logging to
automatically generate the file name.
Note
If multiple devices are on the fieldbus segment, the device or host system with the lowest address is
chosen for the file name. (Typically, the fieldbus host system has the lowest address.) You can also
enter a file name.
Displayed data
Each row represents a snap-shot in time when the measurement was taken and displays
the values for the DC voltage, noise, and signal measurements. The DC voltage
measurement value is displayed. The noise levels are divided by frequency into multiple
columns, and the value in the row is the measurement value in mV (peak-to-peak). The
User Guide
Enable or disable logging
Save measurements to an existing log file
Fieldbus Diagnostics application
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Excel, on the
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