1757-SRM Allen-Bradley ControlLogix Datasheet & Technical Manual

Availability: 20 left in stock

Allen-Bradley 1757-SRM ControlLogix System Redundancy Module The Allen-Bradley 1757-SRM, also cataloged as the 1757-SRM System Redundancy Module, operates as a...

SKU: 1757-SRM

Manufacturer: Allen Bradley
Product No.: 1757-SRM
Product Type: PLC Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 452g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Allen-Bradley 1757-SRM ControlLogix System Redundancy Module

The Allen-Bradley 1757-SRM, also cataloged as the 1757-SRM System Redundancy Module, operates as a dedicated hardware component for controller state synchronization within ControlLogix and ProcessLogix platforms.

Hardware Specifications

Parameter	Specification
Model	1757-SRM
Brand	Allen-Bradley
Origin	USA
Weight	1.00 lbs (0.452 kg)
Dimensions	140 x 70 x 145 mm
Operating Temp	0 to 60 deg C (32 to 140 deg F)
Power Consumption	Backplane current draw: 0.75 A @ 3.3 VDC, 1 A @ 5.1 VDC, 0.16 A @ 24 VDC
Module Type	System Redundancy Module
Slot Width	2 slots (ControlLogix chassis)
Power Dissipation	Max 11.28 W
Thermal Dissipation	38.49 BTU/hr
Connector Type	SC fiber optic port (1 transmit, 1 receive channel)
Cable Type	62.5/125 micron multi-mode fiber-optic cable
Supported Controllers	Logix 5560 series and compatible ControlLogix processors
Wavelength	1300 nm
Relative Humidity	Up to 95% non-condensing
Enclosure Type Rating	None (open-style)
IEC Temperature Code	T4

Industrial Control & Drive Integration

The 1757-SRM executes synchronous data transfer routines directly tied to the backplane bus communication velocity properties of the local rack. The module establishes a dedicated fiber-optic link to coordinate memory duplication and I/O density scaling states across paired chassis operating on Profinet / EtherNet/IP deterministic networks. Maintaining identical firmware flash compatibility between the primary and secondary processors, network adapters, and the redundancy modules is required to prevent switchover delays, cross-talk faults, or register discrepancies during cross-chassis replication cycles.

Frequently Asked Questions

Q: Does the 1757-SRM support Removal and Insertion Under Power (RIUP)?

A: Yes. The 1757-SRM hardware supports hot-swapping within the ControlLogix chassis framework. However, removal of an active, synchronized module will disrupt the redundancy cross-link and terminate real-time chassis state mirror tracking.

Q: What are the restrictions regarding the synchronization link cable length?

A: The module accommodates dedicated multi-mode fiber-optic cables utilizing SC-type connectors. Verified operation is limited to specific pre-fabricated physical lengths: 1 m, 3 m, 10 m, 50 m, and 100 m options (cataloged under 1757-SRC series).

Field Installation Guidelines

Mechanical Slot Occupancy: Insert the 1757-SRM into any two adjacent available slots within the primary ControlLogix chassis. Press the module evenly into the backplane connectors until the top and bottom installation latches lock completely into the chassis framework.
Fiber-Optic Connection and Minimum Bend Radius: Align the SC-type connector plugs with the optical port on the front face of the module. Ensure the multi-mode fiber cable does not exceed the minimum structural bend radius limits to prevent optical attenuation or signal loss at the 1300 nm operating wavelength.
Hardware Matching Verification: Prior to initializing commissioning, verify that both the primary and secondary redundant chassis contain identical hardware configurations, power supply ratings, and matched module revisions to allow valid system cross-synchronization.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.