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 following components. 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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