Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 17
About Enhanced Redundancy Systems Chapter 1
Features Not Supported
• Any motion feature
• Any SIL3 functional safety feature within the redundancy controllers
• Firmware Supervisor
• Event Tasks
• Firmware revision 19.052 for 1756-L7x controller
Enhanced Redundancy
System Components
Communication between a redundant chassis pair that includes matching
components makes redundancy possible.
Each chassis in the redundant chassis pair contains these
ControlLogix components:
• One ControlLogix power supply - Required
• One ControlLogix redundancy module - Required
Redundancy modules link the redundant chassis pair to monitor events in
each of chassis and initiate system responses as required.
• At least one ControlLogix ControlNet or EtherNet/IP communication
module - Required
• Up to two controllers - Optional
In addition, redundant chassis are connected to other components outside the
redundant chassis pair, for example, remote I/O chassis or human-machine-
interfaces (HMIs).
For more information about components you can use in an enhanced
redundancy system, see Chapter 2
, Design an Enhanced Redundancy System on
page 23.
For Ethernet modules, signed and unsigned firmware are available. Signed modules provide the
assurance that only validated firmware can be upgraded into a module.
Signed and unsigned firmware:
• Both signed and unsigned firmware are available.
• Product is shipped with unsigned firmware. To obtain signed firmware, you must upgrade your
product’s firmware.
• To obtain signed and unsigned firmware, go to Get Support Now
.
• Once signed firmware is installed, subsequent firmware upgrades must be signed also.
There are no functional/feature differences between signed and unsigned communication modules.
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