ControlLogix System

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Controllers

Redundant Controllers

The ControlLogix controller supports controller redundancy. In a redundant controller system, you need:

• Two 1756 chassis each with the same:
  
  • number of slots
    
  • modules in the same slots
    
• Redundancy firmware revisions in each module
  
• Two additional ControlNet nodes outside the redundant chassis pair
  
• And one of the following:
  
  • one 1756-RM module per chassis and one 1756-RMCx cable, or
    
  • one 1757-SRM module per chassis and one 1757-SRCx cable
    

ControlLogix Redundancy Modules

Specifications [PDF]

Cat. No.	Description	Controllers Supported	Communication Modules Supported
1756-RM	ControlLogix redundancy module	• two 1756-L61, 1756-L62, 1761-L63 controllers or • one 1756-L64 controller	seven, max (1756-CN2 series B, 1756-CN2R series B, or 1756-EN2T modules)
1757-SRM		one 1756-L61, 1756-L62, 1756-L63, 1756-L64 controller	seven, max (1756-CNB series D or E, 1756-CNBR series D or E, 1756-ENBT, or 1756-EWEB modules)

Connector Cables

Cat. No.	Description	Length
1756-RMC1	Cable, 1756-RM redundancy module	1 m (3.28 ft)
1756-RMC3		3 m (9.84 ft)
1756-RMC10		10 m (32.81 ft)
1757-SRC1	Cable, 1757-SRM redundancy module	1 m (3.28 ft
1757-SRC3		3 m (9.84 ft)
1757-SRC10		10 m (32.81 ft)
1757-SRC50		50 m (164.04 ft)
1757-SRC100		100 m (328.08 ft)