Ams trex™ Device Communicator

5.2
Fieldbus Diagnostics Overview screen
The 
Fieldbus Diagnostics Overview
screen is the home screen for the application. The
screen displays the status of the measurements and lets you configure the application.
Note
The 
Power supply
option is not displayed if the Trex unit has the Device Communicator
communication module. The Device Communicator Plus communication module and
FOUNDATION fieldbus Power Plug are required to power a FOUNDATION fieldbus device.
The measurements are labeled with a status of 
GOOD
, 
BAD
, or 
CHECK
. You can configure
the measurement criteria and ranges for the 
GOOD
and 
BAD
status labels. The INACTIVE
status is displayed when there is no fieldbus signal, due to no device communication on
the fieldbus segment. Review the measurement criteria in 
Settings
to ensure they are
appropriate for your installation.
Fieldbus Diagnostics application
User Guide
September 2021
152
User Guide

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Figure 5-1: Fieldbus Diagnostics screen at start up
User Guide 
Fieldbus Diagnostics application
September 2021
User Guide 
153

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Figure 5-2: Fieldbus Diagnostics Overview screen while taking measurements
A. View the status of the DC voltage measurement.
B. View the status of the noise measurements.
C. View a spectrum of the low-frequency, in-band, and high-frequency noise
measurements.
D. Set options for displaying and collecting the measurements.
E. View the values for each measurement.
F. 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.
G. 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.
H. View the status of the fieldbus signal measurement.
I. 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
Fieldbus Diagnostics application
User Guide
September 2021
154
User Guide

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communication on an externally- powered fieldbus segment, 
Go Online
 starts fieldbus
network communications so fieldbus signals can be measured.
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.
Note
The Fieldbus Diagnostics application does not show which device is the LAS on the fieldbus
segment. The Trex unit will become the LAS if no other LAS is on the fieldbus segment.