Fieldbus Diagnostics Application - Emerson AMS Trex User Manual

5

Fieldbus Diagnostics application

Topics covered in this chapter:
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The Fieldbus Diagnostics application lets you run diagnostics to troubleshoot fieldbus
segments and devices. It provides power and basic communications for verifying device
operations on an isolated mini-segment. The application provides optional
communications for identifying the device list. You can connect the Trex unit at various
points along the fieldbus segment, so you can isolate the location of a problem.
The Fieldbus Diagnostics application can help you identify problems caused by loose wire
connections, water or moisture in cables or terminal housings, improper grounding, or
issues with fieldbus segment installations.
Note
The Fieldbus Diagnostics application can be used with the Device Communicator communication
module or Device Communicator Plus communication module. However, the Trex unit cannot
power a FOUNDATION fieldbus device with the Device Communicator communication module. The
application also requires a fieldbus license.
Measurements
The Fieldbus Diagnostics application lets you measure:
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User Guide
Open or close the Fieldbus Diagnostics application
Fieldbus Diagnostics Overview screen
GOOD, BAD, and CHECK measurements in Fieldbus Diagnostics
Wiring diagrams for the Fieldbus Diagnostics application
Power a FOUNDATION fieldbus device
Connect to an externally-powered fieldbus segment
Measure the DC voltage, noise, and the fieldbus signal
Details screen
View the live measurement values in Fieldbus Diagnostics
View help for a measurement
Noise spectrum
Settings
Saving measurements to a log file
Troubleshooting Fieldbus Diagnostics
DC voltage: -34 to 34 volts
Noise: Low-frequency (870 Hz - 9 KHz), in-band frequency (9 KHz - 39 KHz), and
high-frequency noise (39 KHz - 100 KHz)
Fieldbus signal level: 100 - 1200 mV (peak-to-peak)
Fieldbus Diagnostics application
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