Allen-Bradley E Series Installation Instructions Manual page 9

All 1756-CNB and 1756-CNBR modules are keeper-capable, as listed.
1756-CNB and 1756-CNBR
A
B
C
C
D
D
E
E
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.
ControlLogix ControlNet Interface Module 9
Major/Minor Revision
1.xx
2.xx
3.xx
4.xx
5.xx
7.xx
10.xx
11.xx
Publication
1756-IN604A-EN-P - February 2006
Keeper Type
Single-keeper
Multi-keeper
Single-keeper
Multi-keeper
Multi-keeper
Multi-keeper
Multi-keeper
Multi-keeper