Allen-Bradley 1756-CNB/E, User Manual

Page: 49 / 186

Publication 1756-UM523F-EN-P - December 2006
Install the System 49
Install the Remote Chassis
or Rails
You must install all I/O modules and additional types of
communication modules in remote chassis or on DIN rails. This
example shows a remote 1756 chassis. You can use any type of
chassis or device that you can connect to the ControlNet network.
As you install the chassis, follow these guidelines:
•
Do not assign any device to the address of the CNB modules in
the redundant chassis plus one.
For example, if you set the rotary switches of the CNB modules
in the redundant chassis to node 11, no other device should use
node 12.
•
Use a remote chassis for communication modules such as:
– 1756-ENET
– 1756-DHRIO
– 1756-MVI
– 1756-DNB
42197
L
5
5 S
R
M C
N
B C
N
B D
N
B L
5
5 S
R
M C
N
B
DeviceNet Network
I/O Modules
Other ControlNet Node(s)
You must have at least 2 other nodes in addition to the redundant
chassis pair. See Lay Out the System on page 2.
E
N
B
T E
N
B
T
IMPORTANT
If you connect the workstation to the network via a network
access port on a CNB module, use a CNB module in a remote
chassis. This lets a switchover occur after the failure of a
ControlNet tap of a primary chassis.