Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual - Manual (Page 279)

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 279
Enhanced Redundancy System Checklists Appendix F
ControlLogix Controller Checklist
ControlNet Checklist

Requirement
Identical ControlLogix controllers are placed in the same slot of both chassis of the redundant pair.
Partnered controllers are identical in redundancy firmware revision, and memory size.
Within each redundant chassis, one or two (maximum) of these controllers are used:
• 1756-L61, 1756-L62, 1756-L63, 1756-L63XT, 1756-L64
(1) , 1756-L65
• 1756-L71, 1756-L72, 1756-L73, 1756-L73XT, 1756-L74, 1756-L75
Do not combine 1756-L6x and 1756-L7x controllers in a redundant chassis.
Each controller in the redundancy chassis has enough memory to store twice the amount of controller data and I/O memory. (See
Knowledgebase ID 28972 for more
information.)
Eight controller connections are reserved for redundancy use.
(1) When using ControlLogix enhanced redundancy system, revision 16.081 or earlier, you cannot use two 1756-L64 controllers in the same chassis. You can, however, use a 1756-L64 controller in the same
chassis as a 1756-L61, 1756-L62, or 1756-L63 controller.

Requirement
ControlNet Module
Identical ControlNet modules are placed in the same slot of both chassis of the redundant pair.
ControlNet modules are identical in redundancy firmware revision and in series.
Only the 1756-CN2/B, 1756-CN2R/B, or 1756-CN2RXT ControlNet modules are used.
Partnered ControlNet modules both have identical keeper information as explained in the ControlNet Modules in Logix5000 Control Systems User Manual, publication
CNET-UM001 .
Three connections of the ControlNet module are appropriately reserved for redundancy system use.
ControlNet Network
USB ports of communication modules in the redundant chassis are not used while the system is running (online).
At least four ControlNet nodes are used on the ControlNet network. That is, at least two ControlNet nodes are on the ControlNet network in addition to the two ControlNet
modules in the redundant chassis.
These requirements apply to at least one ControlNet node:
• It is not in the redundant chassis pair.
• It uses a node address lower than the ControlNet node addresses of modules in redundant chassis pair.
These requirements apply to all ControlNet communication modules available in an enhanced redundancy systems.
ControlNet module partners in the redundant chassis have the following:
• Node address switches set to the same address (for example, both modules’ switches are set to node address 13).
• Two consecutive node addresses reserved (for example, nodes 13 and 14) to accommodate a switchover. The primary ControlNet module can have an even or odd-
numbered node address.
The ControlNet network is scheduled by using techniques described in the ControlNet Modules in Logix5000 Control Systems User Manual, publication CNET-UM001 . (1)
Devices on other communication networks are bridged to the ControlNet network appropriately.