Wiring Diagrams For The Fieldbus Diagnostics Application - Emerson AMS Trex User Manual

Fieldbus signal status note
With in the range for all nodes
Signal low/high on all devices
Signal low/high on most devices
Signal low/high on few devices
Signal low/high on <device address>
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.
User Guide
Description
All devices on the fieldbus segment have a GOOD fieldbus
signal.
All devices on the fieldbus segment have signal
measurements that are higher than the set maximum
value or lower than the set minimum value.
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.
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.
Only one fieldbus device has a signal measurement that is
higher than the set maximum value or lower than the set
minimum value.
Fieldbus Diagnostics application
155