Rockwell Automation 22-COMM-B PowerFlex BACnet MS/TP Adapter - Manual (Page 21)

Installing the Adapter 2-5
Network with PowerFlex Drives at Starting and/or Ending Nodes
For a network with PowerFlex drives at the starting and/or ending nodes
(
Figure 2.3 ), set their 22-COMM-B adapter’s TERM, -BIAS, and +BIAS
switches to the “Down” (On) position. All other PowerFlex drive
network nodes must have these switches set to the “Up” (Off) position.
Figure 2.3 Example Network with PowerFlex Drives at Starting and/or Ending Nodes
Network with PowerFlex Drives at Other Nodes
For a network with PowerFlex drives at other node locations—not
starting and/or ending nodes (
Figure 2.4 ), set their 22-COMM-B
adapter’s TERM, -BIAS, and +BIAS switches to the “Up” (Off)
position. In this network scenario, other brands of building automation
products at the starting and/or ending nodes require appropriate
termination and bias resistors. Refer to their documentation for details.
Figure 2.4 Example Network with PowerFlex Drives at Other Nodes
BACnet MS/TP Network
Node 1
(Starting Node)
Node n
(Ending Node) Node 2 Node 3 Node 4
22-COMM-B Adapter Settings for
TERM, -BIAS, and +BIAS Switches
■ ■ ■
"Down" (On) Positions "Down" (On) Positions "Up" (Off) Positions
BACnet MS/TP Network
Node 1
(Starting Node)
Other Brand
Building Automation
Product
Node n
(Ending Node)
"Up" (Off) Positions
22-COMM-B Settings
for TERM, -BIAS, and
+BIAS Switches
Node 2 Node 3 Node 4
Requires
Termination and
Bias Resistors
■ ■ ■
Other Brand
Building Automation
Product
Requires
Termination and
Bias Resistors
PowerFlex 4-Class Drives