Allen-Bradley 1757-SRM ControlLogix System Redundancy Module

Overview

The Allen-Bradley 1757-SRM is a high-reliability System Redundancy Module for ControlLogix and ProcessLogix environments. It enables fault-tolerant operation by allowing redundant controller configurations, ensuring continuous system availability and minimizing downtime in critical automation applications.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model & Part Number: 1757-SRM

• Category: PLCs

• Product Line: ControlLogix

• Module Type: System Redundancy Module

• Weight: 1.00 lbs (0.45 kg)

• Backplane Current: 0.160 A at 24V DC

• Supported Controllers: Logix 5560

• Maximum Power Dissipation: 11.28 W

• Maximum Thermal Dissipation: 38.49 BTU/hr

• Slot Width: 2

• Operating Temperature: 0–60°C (32–140°F)

• Enclosure Type: Open-style (no rating)

• Connector: SC fiber-optic type

• Cable Compatibility: 62.5/125 μm multi-mode fiber-optic

• Wavelength: 1300 nm

• Fiber Channels: 1 transmit and 1 receive

• Connector Cable Options: 1757-SRC1 (1 m), 1757-SRC3 (3 m), 1757-SRC10 (10 m), 1757-SRC50 (50 m), 1757-SRC100 (100 m)

Applications

• High-availability PLC systems requiring redundant controllers

• Critical process control in manufacturing plants and utility operations

• Systems requiring uninterrupted communication between redundant modules

FAQ

Q: Which controllers are compatible with the 1757-SRM?
A: The 1757-SRM supports Logix 5560 controllers in ControlLogix and ProcessLogix setups.

Q: What fiber-optic cables are recommended for the module?
A: Allen-Bradley fiber-optic cables such as 1757-SRC1, SRC3, SRC10, SRC50, and SRC100 are compatible.

Q: Can this module operate in harsh industrial environments?
A: The module operates within 0–60°C (32–140°F) and is suitable for standard control cabinet installations; however, it does not have a sealed enclosure rating.

Q: How many channels does the module have?
A: It provides a single channel for transmit and receive fiber communication.