5 Fieldbus Diagnostics application
Topics covered in this chapter:
• 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
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:
• 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
User Guide 149
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