Emerson AMS Trex, User Manual

Page: 176 / 214

4. Tap
OK
.
5.12.4 Set the range of values for the GOOD and BAD status
You can set the range of measurement values that determine the GOOD and BAD status
for a measurement on the Fieldbus Diagnostics Overview screen. Any measurements
within the set minimum and maximum values are labeled GOOD. By default, the values are
set to include typical operating levels of DC voltage, noise, and signal-level based on the
Fieldbus standard.
If you adjust the minimum and maximum values, the values for the CHECK status adjust as
well. If you expand range between the minimum and maximum values, the range of values
for the CHECK status is reduced.
Procedure
1. On the Fieldbus Diagnostics Overview screen, tap Settings .
2. Tap
Measurement criteria
.
3. Enter the minimum and/or maximum values for each measurement type.
4. Tap Back to complete the changes.
5.12.5 Reset the Fieldbus Diagnostics settings to the default
values
You can reset the settings back to the default values. You need to access two screens to
set all settings back to their default values.
Procedure
1. On the Fieldbus Diagnostics Overview screen, tap Settings .
2. Tap Reset to Default to reset the options on the Settings screen to the default values.
3. Tap
Measurement criteria
on the Settings screen.
4. Tap Reset to Default to reset the options on the Measurement criteria screen to the
default values.
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.
Fieldbus Diagnostics application
168 User Guide