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 <device address> 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.
Figure 5-3: Power and connect to a FOUNDATION fieldbus device
To power a FOUNDATION fieldbus device, the Trex unit needs the FOUNDATION fieldbus
Power Plug. When the Trex unit powers a device, it also provides two terminators and a
power conditioner.
WARNING
The Trex unit can power only one FOUNDATION fieldbus device in a bench setup.
A. FOUNDATION fieldbus Power Plug
Fieldbus Diagnostics application User Guide
September 2021
158 User Guide
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