Emerson AMS Trex User Manual page 160

Fieldbus Diagnostics application
Figure 5-2:
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Note
If you connect the Trex unit to an active fieldbus segment with a LAS, the devices, the device
addresses, and signal measurements are displayed on the Details screen. However, the device's tag is
displayed only after you tap Go Online.
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Fieldbus Diagnostics Overview screen while taking measurements
View the status of the DC voltage measurement.
View the status of the noise measurements.
View a spectrum of the low-frequency, in-band, and high-frequency noise measurements.
Set options for displaying and collecting the measurements.
View the values for each measurement.
Enable or disable saving the measurements to a log file (.csv,), and set the logging settings.
Multiple sets of measurements can be saved to create a trend/report.
Enable or disable power to a FOUNDATION fieldbus device. The Trex unit needs the Device
Communicator Plus communication module and the FOUNDATION fieldbus Power Plug to power a
fieldbus device.
View the status of the fieldbus signal measurement.
Tap Go Online or Go Offline to have the Trex unit go online or offline. When the Trex unit is on an
externally-powered fieldbus segment with fieldbus communications, Go Online queries devices for
their tags. The option also adds the Trex unit to the device list on the Details screen, so you can
compare the Trex unit's known good signal to a device's signal. When the Trex unit is powering a
device or when there is no fieldbus communication on an externally- powered fieldbus segment, Go
Online starts fieldbus network communications so fieldbus signals can be measured.
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