Configured for controller redundancy within a ControlLogix chassis architecture, the Allen-Bradley 1756-RM/A (1756-RM Redundancy Module) manages the hardware interface required for supported redundant controller configurations.

Model and Configuration

The 1756-RM/A is identified as a ControlLogix Redundancy Module. The supplied configuration data specifies support for two 1756-L61, 1756-L62, or 1756-L63 controllers, or one 1756-L64 controller with up to seven communication modules.

The spare model designation is 1756-RM.

Electrical and Environmental Data

ControlLogix Redundancy Interface

The 1756-RM/A provides the module-level hardware function required by the specified ControlLogix redundancy architecture. Its configuration capacity is directly associated with the supported controller and communication-module combinations.

The stated architecture permits two 1756-L61, 1756-L62, or 1756-L63 controllers, while an alternative configuration supports one 1756-L64 controller together with up to seven communication modules. The exact chassis arrangement must follow the applicable ControlLogix redundancy configuration rules.

Backplane and Thermal Characteristics

The supplied electrical data specifies a current draw of 4 mA at 1.2 VDC. Power dissipation is rated at 9 W, corresponding to a stated thermal dissipation of 31 BTU/hr.

The operating range is 0 to 60 deg C, while the specified storage range extends from -40 to 85 deg C. Enclosure temperature, chassis loading, and adjacent module heat generation should be considered during installation.

Ordering Information

• 1 x Allen-Bradley 1756-RM/A ControlLogix Redundancy Module
• 1 x Product identification corresponding to 1756-RM/A
• 1 x Module hardware assembly
• 1 x Related mounting and chassis interface hardware as supplied with the module
• Communication modules and controllers are not included unless specifically listed in the supplied configuration.

Installation Requirements

• Install the module in a compatible ControlLogix chassis according to the applicable installation documentation.
• Verify that the selected controller combination matches the supported redundancy configuration.
• Confirm available chassis power and thermal capacity before installation.
• Maintain adequate clearance around the chassis for heat dissipation.
• Route communication and signal wiring away from high-current power conductors where practical.
• Follow the applicable ControlLogix grounding and bonding requirements for the complete chassis assembly.
• Verify module and controller firmware compatibility before commissioning a redundant configuration.
• Do not exceed the stated communication-module configuration for the selected controller arrangement.

Frequently Asked Questions

• What is the primary function of the 1756-RM/A?

  The module provides the hardware function required for ControlLogix controller redundancy configurations within the specified supported system architecture.

• Which controllers are supported in the listed two-controller configuration?

  The supplied data specifies two 1756-L61, 1756-L62, or 1756-L63 controllers for the supported configuration.

• Can the 1756-L64 be used with this module?

  Yes. The supplied specification identifies one 1756-L64 controller as an alternative supported configuration.

• How many communication modules are specified for the 1756-L64 configuration?

  The supplied data specifies support for up to seven communication modules with one 1756-L64 controller.

• What is the module current draw?

  The listed current draw is 4 mA at 1.2 VDC. This value should be included when evaluating the applicable chassis electrical loading.

• How much power does the module dissipate?

  The specified power dissipation is 9 W, with a corresponding thermal dissipation value of 31 BTU/hr.

• What is the operating temperature range?

  The specified operating range is 0 to 60 deg C. Installation conditions should keep the chassis environment within this range.

• What is the storage temperature range?

  The specified storage temperature range is -40 to 85 deg C. Storage conditions should remain within this range before installation.