Emerson USB Fieldbus Interface User Manual page 21

June 2012
Figure 3-9:
3.5 Connecting to a live fieldbus segment
WARNING!
Do not use the Provide Power option on the Fieldbus Device Configuration utility when connecting
to a live segment. Doing so can disrupt communications and may compromise automation safety.
1. Make sure the USB Fieldbus Interface is connected to the computer and
that all software and drivers are installed.
2. Plug one end of the field lead to the fieldbus device connection socket of
the interface and connect the other end to the live fieldbus segment.
Notes
• The USB Fieldbus Interface draws current of 10 mA from the segment. Make sure the
segment has enough power and has the capacity to provide this additional current.
• Make sure the lead set is connected to the live fieldbus segment with the correct polarity.
• Commissioning, decommissioning, and changing the device tag/address are not allowed
for fieldbus devices connected to a live segment.
Sample benchtop connection
User's Manual
21