Rockwell Automation 1756-CN2RXT ControlLogix-XT ControlNet Interface Module, Series B Installation Instructions - Manual (Page 9)

ControlLogix-XT ControlNet Interface Module 9
Publication 1756-IN634A-EN-P - April 2009
Using the 1756-CN2RXT for Standalone or Redundant Control
You can use the 1756-CN2RXT modules either in standalone or
redundant configurations.
A standalone configuration uses:
• one control chassis that contains the 1756-CN2RXT and the
1756-L63XT controller.
• one or both channels of the 1756-CN2RXT module connected
to the ControlNet network.
A redundant configuration uses:
• two controller chassis called the redundant chassis pair. Each
chassis of the pair must contain at least these modules:
– 1756-L63XT controller.
– 1756-CN2RXT ControlNet module.
– 1756-RMXT redundancy module.
• one or both channels of the 1756-CN2RXT module connected
to the ControlNet network.
For more information about redundancy control, refer to the
ControlLogix Redundancy System User Manual, publication
1756-UM523 .
IMPORTANT
If you are using the 1756-CN2RXT in a redundant system, these hardware
considerations must be made:
• Each redundant chassis of the pair must be configured with identical
modules placed in identical slots. These module pairings between the
two chassis are called partners.
• All partner modules in redundant chassis pairs must be at the same
firmware revision.
• For ControlNet module partners, the ControlNet network address must
be the same for each module of the pair.
• These modules cannot be used in redundant chassis pairs that contain
1756-CN2RXT modules:
– 1756-DHRIOXT or 1756-DHRIO
– 1756-SRM