Allen-Bradley 1756-RM/A ControlLogix Redundancy Module

The Allen-Bradley 1756-RM is a redundancy module specifically designed for the ControlLogix platform. It enables redundancy for controllers by managing the connectivity between two identical controllers deployed in a rack with identical components and configurations. This module offers redundancy system monitoring and module health monitoring via an embedded LED display that includes indicators for PRI, COM, and OK. The 1756-RM is available in series A and B, and it is strongly recommended to install the same series to maximize the redundancy setup's functionality.

Power Consumption and Dissipation

• Current Consumption:
  • 4 mA at 1.2 volts DC
  • 1.2 mA at 5.1 volts DC
  • 120 mA at 24 volts DC
• Power Dissipation: 9 watts
• Thermal Dissipation: 31 BTU per hour

Physical and Environmental Specifications

• Enclosure: Open
• Temperature Code: T4
• Operating Temperature Range: 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)
• Storage Temperature Range: -40 to 85 degrees Celsius

Compatibility and Connectivity

• Compatible Chassis: 1756-A4/A7/A10/A13/A17 ControlLogix chassis
• Compatible Power Supplies: 1756-PA72/PA75/PB72/PB75 standard power supplies, as well as other 1756-xx redundant power supplies
• Slot Requirement: Single-slot module that can be installed in any available chassis position
• Redundancy Cable: Requires 1756-RMCx redundancy cable to synchronize the redundant controller pair's operation
• Fiber Optic Connector: One LC fiber optic connector with single-mode operation
• Network Speed: 100 Mbps when paired with the same series of redundancy modules

Configuration and Setup

The 1756-RM can be configured using the redundancy configuration utility for setting up redundancy and the Studio 5000 Logix Designer for configuring the module's global parameters. The redundant pair's configuration must match that of the companion chassis to ensure optimal performance.

Certifications

The 1756-RM module carries certifications from the following standards:

• CE
• CSA
• Ex
• C-Tick
• cUL-us

Technical Specifications for 1756-RM

• Manufacturer Name: Allen Bradley
• Product Type: Redundancy module
• Series: ControlLogix
• Current Draws: 4 milliamps at 1.2 VDC, 1.2 milliamps at 5.1 VDC, and 120 milliamps at 24 VDC
• Power Dissipation: 9 watts
• Thermal Dissipation: 31 BTU per hour
• Certification: CE, CSA, Ex, C-Tick, and cUL-us
• IEC Temperature Code: T4
• Storage Temperature: (-40 to 85) degrees Celsius
• Operating Temperature: 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)