Redundant Link Module

Updated September 20, 2026

Overview

Product sourcing insights & recommendations

27 来源

A Redundant Link Module (RLM) is a specialized industrial networking device that enhances system reliability by converting single, non-redundant communication lines into dual redundant paths. Abb Seita This ensures that critical data traffic continues even if one cable or port fails, effectively eliminating single points of failure in automation networks. Trainingcamp Maplesystems

Core Product Insights

Standard modules like the ABB RLM01/RLM02 are designed for PROFIBUS DP/FMS networks. Profibus Abb

* Key Functionality: It acts as an active switch, monitoring two redundant lines (A and B). It routes the first valid telegram to the station and automatically fails over if an error occurs. Comark Seita

* Technical Specs: Supports high-speed data rates up to 12 MBit/s and often features redundant 24 VDC power inputs to ensure the module itself remains powered during electrical faults. Seita Scribd

* Topology Flexibility: These modules can be placed at the master, before a segment of slaves, or for individual critical devices. Seita

Market Trends & 2026 Outlook

The redundancy module market is witnessing significant growth, driven by the shift toward high-availability infrastructure:

* Growth Projections: The global redundancy modules market is expected to grow at a CAGR of 7–9% through 2035, with some segments like high-availability power modules seeing growth up to 13.2%. Linkedin Indexbox

* Market Drivers: The explosion of Tier 4 Data Centers (aiming for 99.999% uptime) and the rapid adoption of Industry 4.0 automation are the primary drivers. Indexbox Jll

* Technological Shifts: By 2026, the trend is moving toward more compact DIN-rail mounted designs with integrated diagnostics like IO-Link and improved energy efficiency to reduce heat in control cabinets. Mordorintelligence Youtube

Sourcing Landscape

Available products range from specialized RS485 modules for legacy PROFIBUS systems to Optical Link Modules (OLM) for fiber-optic redundant rings. Siemens Alibaba

* Price Range: Standard PROFIBUS modules like the RLM01/RLM02 range from $123 to $1,900 per unit, depending on condition and supplier. Alibaba Alibaba

* Suppliers: Major hubs for these industrial components are located in Xiamen and Shenzhen, China, with high transaction volumes for brands like Siemens and ABB. Alibaba Alibaba

The following files contain a detailed breakdown of available products, pricing, and supplier specifications for your reference.

Based on these market findings, you can continue with:

Sources & References

27 sources cited · Verified industry data & reports

PROFIBUS Redundancy Link Module RLM01

ABB

Converts a non-redundant PROFIBUS line to two redundant lines or vice versa. Acting like an active switch, it converts two redundant lines to one PROFIBUS DP ...

Redundancy Link Module RLM01 - Product Finder

PROFIBUS & PROFINET International (PI)

Redundancy Link Module Converts a non redundant RS 485 PROFIBUS DP / FMS line to two redundant RS 485 PROFIBUS DP / FMS lines and vice versa (line redundancy).

Redundant Profibus network configuration with Optical link ...

Siemens SiePortal

Redundant Profibus network configuration with Optical link modules … it will transmit to signal received on one port to all other ports.

RLM01 Redundancy Link Module for PROFIBUS DP/FMS - Seita

seita.com.co

Either a single or a redundant power supply with 24 VDC is possible. The distribution of load across L1+ and L2+ is based on the level of the voltages applied.

What is Redundant Links? - Glossary

Training Camp

Redundant links are additional network connections that provide alternate paths between devices so that traffic can continue flowing if the primary link or ...

PROFIBUS Redundancy Link Module RLM02

ABB

Acting like an active switch, it converts two redundant lines to one PROFIBUS DP line or vice versa. The RLM02 amplifies signal form