Redundant Chassis Requirements

For a redundant chassis pair, you can use any ControlLogix® or ControlLogix-XT™ chassis of the same size. For example, if the primary chassis uses a 1756-A4 chassis, the secondary chassis must use a 1756-A4 chassis. Each redundant chassis in a pair must contain the components in the following table. If the chassis is used as a redundant gateway, then a controller is not required.
Required Chassis Components
Required Component
Modules Allowed in Each Chassis
Controller
1, max
Redundancy module
1, max
Communication module
1, min
7, max
You can also use any number of optional slot filler modules, catalog number 1756-N2.
IMPORTANT: Do not place I/O modules in a redundant chassis.
These configuration parameters must match for the components in a redundant chassis pair during normal system operation:
  • Module type
  • Chassis size (all rack sizes are supported)
  • Slot placement
  • Firmware revision
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