Allen Bradley ControlLogix Redundancy Enhanced Module 1756-RM2


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  • Manufacturer: Allen Bradley – PLC
  • Product Type: PLC/Programmable Logic Controller
  • Part Number: 1756-RM2
  • Series: ControlLogix
  • UPC: 884951800434
SKU: 1756-RM2 Category:


The Allen-Bradley 1756-RM2 ControlLogix redundancy module provides higher cross load speeds with ControlLogix 5570 and 5560 controllers to build redundant systems. This Allen-Bradley 1756-RM2 can be supplied from 1756-PA75R1756-PB75R or 1756-PSCA2 power supplies with a current draw of 1.16 amperes and power consumption of 6 watts. This Allen-Bradley single-slot 1756-RM2 module can be installed on a ControlLogix-XT chassis. This ControlLogix redundancy module can operate at a temperature range of 0 degrees to 60 degrees Celsius (32 degrees to 140 degrees Fahrenheit) and weighs approximately 0.29 kilograms (0.64 pounds) while shipping.

  • Current draw @ 5.1V DC: 1.16 A
  • Current draw @ 24V DC: 3.4 mA
  • Power dissipation: 6 W
  • Thermal dissipation: 21 BTU/hr
  • Connector cables: 1756-RMC1, 1 m (3.28 ft), 1756-RMC3, 3 m (9.84 ft), 1756-RMC10, 10 m (32.81 ft)
  • Slot width: 1
  • Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
  • Module location: Chassis-based, any slot
  • Controller families, supported: ControlLogix 5560, ControlLogix 5570
  • Power supply, standard: 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75
  • Power supply, redundant: 1756-PA75R, 1756-PB75R, 1756-PSCA2
  • Weight, approx.:0.29 kg (0.64 lb)
  • Mounting: ControlLogix-XT chassis, single-slot module
  • Operating temperature range: 0 °C…60 °C (32 °F…140 °F)
  • Relative humidity: 5…95% noncondensing

The Allen-Bradley 1756-RM2 is a ControlLogix Redundancy Module. It has enhanced features with speeds of up to 1000 Mbps. When paired with 1756-L7x controllers in both chassis, it gives the best scan performance. For cross loading, the 1756-RM2 uses redundant fiber ports with no single point of failure. During channel switchover, the processing chassis remains synched while the scan time may encounter a delay of around 10 ms. It has enhanced safety features with interference-free diagnostics.

The 1756-RM2 redundancy module draws 1.16 A current at 5.1V DC and 3.4 mA at 24V DC. It has a maximum power dissipation of 6W and a thermal dissipation of 21 BTU/hr. It can be installed in any slot in a ControlLogix chassis. The 1756-RM2 weighs 0.64 lbs. and it has an open enclosure. For communication, it supports up to seven enhanced ControlNet and EtherNet/IP communication modules. For wiring, the 1756-RM2 supports 1756-RMC1, 1756-RMC3 and 1756-RMC10 cable with 1m, 3m and 10m lengths respectively.

The ControlLogix 5560 and ControlLogix 5570 series of controllers support the 1756-RM2 module. The Redundancy Module Configuration tool, RSLinx 2.59.

A variety of synchronization speed may be enabled depending on the combination of redundancy module used. Particularly, if used with the same 1756-RM2 module, speed may reach up to 1000 Mbps. If both series A or series B 1756-RM2 are used, speed may reach up to 100 Mbps. Up to 20 ms controller switchover may be achieved with the use of the 1756-RM2 redundancy module.

Unlike the first versions of the redundancy module, the 1756-RM2 only occupies a single slot of any ControlLogix chassis. When implementing redundancy, A pair of redundant racks must be installed with each rack installed with the same controller type and revision. I/O modules, intelligent modules and encompass partner modules cannot be installed in any of the redundant chassis pair. These modules must be installed on a 3rd or higher order chassis, depending on the supported number of node of the communication module used.

The Redundancy module has integrated fiber optic connector where the controller synchronization is actively happening. This Fiber cable has LC-Type connector with cable type of 8.5/125 micron single-mode fiber-optic cable. Up to 10 km (10,000 m, 10936.13 yd) of distance can be established between each redundancy module however, it is ideal that the redundant chassis pair is near each other.

Additional information

Weight 0.43 kg


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