Emerson AMS Trex Device Communicator User Manual page 162

Fieldbus Diagnostics application
September 2021
5.8
162
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b) Open Fieldbus Diagnostics.
The measurement status appears on the screen.
c) If the signal measurement status is "INACTIVE" or if you want to identify the
device tags that are listed on the Details screen, tap Go Online.
2. If the FOUNDATION fieldbus device is not powered, do the following:
a) Connect the lead set to the FF terminals on the Trex unit and directly to the
communication terminals on the unpowered device. Ensure no other wires
are connected to the device and there is no power to the device. Do not
attach to a junction box.
b) Connect the FOUNDATION fieldbus Power Plug to the FF pwr terminal and
the positive (red) FF terminal on the lead set.
c) Open Fieldbus Diagnostics.
d) On the Fieldbus Diagnostics Overview screen, tap Power supply to enable
power to the device. The Trex unit powers the device.
e) If the signal measurement status is "INACTIVE" or if you want to identify the
device tags that are listed on the Details screen, tap Go Online.
Related information
View the live measurement values in Fieldbus Diagnostics
Set the range of values for the GOOD and BAD status
Details screen
By default, the Details screen displays information about the DC voltage, noise, and
fieldbus signal measurements, including:
• The live measurement values, which are continuously updated.
• The units for each measurement.
• The minimum, maximum, and average measurement value.
• The number of devices on the fieldbus segment.
• The addresses of each device detected on the fieldbus segment. The device tag is also
displayed if you selected Go Online on the Fieldbus Diagnostics Overview screen.
Note
By default, the Details screen is configured to show all the measurement data in columns,
which do not fit on one screen. Scroll to the right on the screen to view additional
columns. (To view only the measurements and the units, tap Settings → Show Min, Max,
Avg to remove the checkmark.)
If a measurement is higher or lower than the set minimum or maximum values in the
measurement criteria, the measurement is highlighted red or orange. Press and hold the
measurement to display a Help option that lists some troubleshooting information. You
can open Help for all cells on the Details screen.
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