Fieldbus signal status note Description
With in 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.
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.
Fieldbus Diagnostics application
User Guide 155
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