Rockwell Automation 22-COMM-B PowerFlex BACnet MS/TP Adapter User 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
(

), 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

(Ending Node)

Node 2

Node 3

Node 4

22-COMM-B Adapter Settings for

TERM, -BIAS, and +BIAS Switches

■ ■ ■

"Down" (On) Positions

"Up" (Off) Positions

BACnet MS/TP Network

Node 1

(Starting Node)

Other Brand

Building Automation

Product

Node

(Ending Node)

"Up" (Off) Positions

22-COMM-B Settings
for TERM, -BIAS, and

+BIAS Switches