Emerson AMS Trex Device Communicator - Connect to Externally-Powered Fieldbus Segment; Measure Fieldbus DC Voltage, Noise, and Signal

Procedure
1. Connect the lead set to the FF terminals on the Trex unit and to the fieldbus
segment or device.
Figure 5-6: One connection option for connecting to the fieldbus segment
A. Terminators
B. Power conditioner
C. Fieldbus power supply
D. Host system
2. Open Fieldbus Diagnostics.
The Trex unit connects to the device/fieldbus segment and begins the
measurements.
3. Optional - Tap Go Online to query devices for their tags.
5.7 Measure the DC voltage, noise, and the
fieldbus signal
The Fieldbus Diagnostics Overview screen displays a GOOD, BAD, or CHECK status for the
measurements to give you a quick summary. Check the measurement criteria in the
Settings to ensure they are appropriate for your installation.
You can view the actual measurement values by tapping Details on the Fieldbus
Diagnostics Overview screen.
Note
Before taking a noise measurement, remove the AC adapter from the Trex unit, if it is
connected. This isolates the Trex unit from the local power grid.
Procedure
1. If the FOUNDATION fieldbus device is externally-powered, do the following:
a) Connect the lead set to the FF terminals on the Trex unit and to the fieldbus
segment or device.
User Guide Fieldbus Diagnostics application
September 2021
User Guide 161
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