Ams trex™ Device Communicator

Default status labels for the DC voltage measurement
Fieldbus Diagnostics application
User Guide
September 2021
156
User Guide

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Default status labels for the noise measurement
Default status labels for the signal measurement
If the fieldbus signal measurement has a BAD or CHECK status, an additional status note is
listed on the Fieldbus Diagnostics Overview screen.
Fieldbus signal status note
Description
Within the range for all nodes
All devices on the fieldbus segment have a GOOD fieldbus
signal.
Signal low/high on all devices
All devices on the fieldbus segment have signal
measurements that are higher than the set maximum
value or lower than the set minimum value.
Signal low/high on most devices
More than half of the devices on the fieldbus segment
have signal measurements that are higher than the set
maximum value or lower than the set minimum value.
User Guide 
Fieldbus Diagnostics application
September 2021
User Guide 
157

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Fieldbus signal status note
Description
Signal low/high on few devices
Fewer than half of the devices on the fieldbus segment
have signal measurements that are higher than the set
maximum value or lower than the set minimum value.
Signal low/high on
Only one fieldbus device has a signal measurement that is
higher than the set maximum value or lower than the set
minimum value.
5.4
Wiring diagrams for the Fieldbus Diagnostics
application
 CAUTION
Remove the USB cable from the Trex unit before connecting to a device.
 CAUTION
The Trex unit draws approximately 12 mA from the fieldbus segment when it is online.
(The Trex unit draws 0 mA when it is offline.) Ensure the power supply or barrier on the
fieldbus segment has the capacity to provide this additional current when the Trex unit is
online. If a heavily loaded fieldbus segment is drawing near the capacity of the segment’s
power supply, connecting the Trex unit may result in loss of communication.