Rockwell Automation 1756-CNB ControlLogix ControlNet Bridge Module, Series E Installation Instructions - Manual (Page 9)

ControlLogix ControlNet Interface Module 9
Publication 1756-IN604A-EN-P - February 2006
All 1756-CNB and 1756-CNBR modules are keeper-capable, as listed.
You must match the keeper to the type of network, or upgrade the
firmware of the module at MAC ID 01 to be multi-keeper capable.
Refer to the ControlNet Modules in Logix5000 Control Systems User
Manual, publication CNET-UM001, for more information.
1756-CNB and 1756-CNBR Major/Minor Revision Keeper Type
A 1.xx Single-keeper
B 2.xx Multi-keeper
C 3.xx Single-keeper
C 4.xx Multi-keeper
D 5.xx Multi-keeper
D 7.xx Multi-keeper
E 10.xx Multi-keeper
E 11.xx Multi-keeper