Allen-Bradley 1756-CNB - Appendix D Series B ControlNet Bridge Modules; Introduction to Series B ControlNet Modules; Communication Loss with Series B Modules

173 Publication 1756-UM523F-EN-P - December 2006
Appendix D
Series B ControlNet Bridge Modules
Introduction
This appendix explains the possible consequences of using a series B
ControlNet Bridge module.
Losing Communication
while Bridging Via a
Series B ControlNet
Bridge Module
You can temporarily lose communication with a remote chassis if you
use both these modules in the remote chassis:
• 1756-CNB/B or 1756-CNBR/B module
and
• 1756-DHRIO module that is connected to a remote I/O network.
Communication Loss While Bridging
Topic Page
Losing Communication while Bridging Via a Series B ControlNet Bridge Module 173
Communication Stoppage While Using a Series B ControlNet Bridge Module 174
C
N
B/
B
L
5
5
M
x
C
N
B
S
R
M
Redundant Chassis Pair
D
H
R
I
O
Remote I/O
1756-CNB/B or 1756-CNBR/B Module
Remote Chassis
IMPORTANT
On the first switchover after you download a project to the controller, you ma
y
temporarily lose communications with these devices
Other Modules