Emerson AMS Trex Device Communicator User Manual page 170

Fieldbus Diagnostics application
September 2021
5.13.1
170
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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
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
signal measurements are organized by valid fieldbus address (16 -255), one column for
each address. The value in each column is the measurement value in mV (peak-to-peak).
Scroll to the right to see all columns in the log file.
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