ABB RLM01 3BDZ00398R1IMG
ABB RLM01 3BDZ00398R1IMG
ABB RLM01 3BDZ00398R1IMG
ABB RLM01 3BDZ00398R1IMG
ABB RLM01 3BDZ00398R1IMG

ABB RLM01 3BDZ00398R1IMG | Redundancy Link Module

  • Brand:​ ABB
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    Model:​ RLM01 (Order Code: 3BDZ00398R1IMG)
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    Product Type:​ Redundancy Link Module
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    Series:​ AC 800M
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    Core Function:​ Provides the synchronization link for redundant pairs of AC 800M process controllers, enabling high availability and bumpless failover.
  • ••
    Key Specs:​ Fiber optic connection, controller synchronization, hot standby.
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Part number: ABB RLM01 3BDZ00398R1IMG
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Description

RLM01: Product Overview
The RLM01 is a redundancy link module designed for ABB’s AC 800M high availability controller system within the System 800xA platform. This specialized module serves as the critical communication channel between two identical AC 800M controllers configured in a redundant pair. Installed in each controller’s baseplate, its primary function is to maintain continuous synchronization of application program memory and process data between the primary and standby controllers. This enables seamless, bumpless transfer of control functionality in the event of a failure in the primary controller.
The module utilizes fiber optic communication to create a high-speed, noise-immune link between the redundant controllers. It continuously mirrors the application program state, I/O data, and internal variables from the primary controller to the standby unit. This synchronization occurs in real-time, ensuring that the standby controller is always updated and ready to assume control without process disruption. The module’s design focuses on reliability and deterministic performance to maintain system availability in critical process applications.

ABB RLM01 3BDZ00398R1IMG

ABB RLM01 3BDZ00398R1IMG

RLM01: Technical Specifications
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    Model Number:​ RLM01
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    Order Number:​ 3BDZ00398R1IMG
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    Manufacturer:​ ABB
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    Product Type:​ Redundancy Link Module
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    Compatible Controller:​ AC 800M (PM8xx series)
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    Connection Type:​ Fiber optic
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    Fiber Type:​ Multi-mode (typically 62.5/125 µm)
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    Data Transfer Rate:​ High-speed synchronization
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    Link Distance:​ Up to several hundred meters (depends on fiber type)
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    Power Supply:​ 5VDC from controller baseplate
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    Status Indicators:​ LED indicators for link status and synchronization
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    Hot-Swap Capable:​ Yes
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    Operating Temperature:​ 0°C to 60°C
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    Relative Humidity:​ 5% to 95% non-condensing

    ABB RLM01 3BDZ00398R1IMG

    ABB RLM01 3BDZ00398R1IMG

Core Features & Customer Value
The primary value of the RLM01 is enabling fault-tolerant control system architecture. For processes where unscheduled downtime results in significant production loss or safety concerns, this redundancy capability is essential. The fiber optic link provides complete electrical isolation between controllers, preventing ground loops and ensuring immunity to electromagnetic interference (EMI) that could disrupt the critical synchronization process.
The module supports automatic detection of primary controller failure and initiates failover to the standby unit within a single controller scan cycle. This rapid switchover is transparent to the process, preventing trips or disturbances. For maintenance personnel, the module’s status LEDs provide immediate visual indication of link health and synchronization status, facilitating quick diagnostics. The hot-swappable design allows for replacement of a faulty module without taking the entire redundant system offline.
Typical Applications
In continuous process industries such as oil refining or chemical production, the RLM01 enables redundant AC 800M controller pairs to manage critical unit operations like reactor control, distillation columns, or compressor anti-surge control. The high availability ensures these processes continue uninterrupted during controller maintenance or hardware failure.
In power generation facilities, redundant controllers synchronized via RLM01 modules manage turbine control, boiler protection, and balance-of-plant systems. The bumpless failover capability is crucial for maintaining grid stability and preventing unit trips.

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