ABB RLM02 Redundancy Link Module | Replacement, Equivalent & Selection Guide
The ABB RLM02 is a dedicated Redundancy Link Module designed for ABB’s AC500 PLC platform, enabling hot-standby redundancy between two CPU units. It ensures continuous process control with zero downtime switchover — a critical requirement in high-availability industrial environments such as power generation, oil & gas, and water treatment.
Technical Specifications
- Part Number: RLM02
- Manufacturer: ABB
- Series: AC500 PLC
- Function: Redundancy Link Module for CPU hot-standby pairing
- Communication Interface: Dedicated redundancy link (fiber or copper, model-dependent)
- Redundancy Type: Hot-standby (bumpless switchover)
- Mounting: Direct plug-in to AC500 CPU module slot
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Power Supply: Supplied via CPU backplane
- Weight: Approx. 500 g
- Certifications: CE, UL (verify with ABB datasheet for specific revision)
Note: Always verify specifications against the official ABB RLM02 datasheet before system integration.
Compatible Replacement & Equivalent Models
When the ABB RLM02 is unavailable or end-of-life, the following alternatives may be considered depending on your system architecture:
- ABB RLM01 — Earlier revision of the redundancy link module; verify firmware compatibility with your CPU version
- ABB PM573-ETH + Redundancy License — Software-defined redundancy option for newer AC500 V3 CPUs
- ABB PM591 / PM592 with built-in redundancy port — Integrated redundancy without a separate RLM module
- Third-party redundancy switches (Hirschmann, Moxa) — For network-level redundancy in distributed I/O architectures (not a direct functional replacement)
Important: Functional equivalence must be validated by a qualified automation engineer. Contact [email protected] for compatibility assessment.
Why Choose the Original ABB RLM02
- ✅ Guaranteed compatibility with ABB AC500 CPU modules (PM571, PM572, PM573, PM581, PM582, PM583, PM591, PM592)
- ✅ Bumpless hot-standby switchover — process continues without interruption on primary CPU failure
- ✅ Factory-tested and ABB-certified — no integration risk from third-party alternatives
- ✅ Full ABB Automation Builder support — native configuration, diagnostics, and firmware updates
- ✅ Long service life — designed for 24/7 continuous industrial operation
Typical Applications
- Power generation and substation automation (IEC 61850 environments)
- Oil & gas pipeline SCADA and safety systems
- Water and wastewater treatment plant control
- Chemical and pharmaceutical batch process control
- Railway signaling and infrastructure automation
- Any SIL-rated or high-availability PLC application requiring CPU redundancy
System Compatibility
The RLM02 is designed for use within the ABB AC500 PLC ecosystem. Confirmed compatible CPU families include:
- AC500 PM5xx series (PM571, PM572, PM573, PM581, PM582, PM583)
- AC500 PM5xx-2ETH series
- AC500 V2 redundancy-capable CPUs
Not compatible with AC500-S (Safety) or AC500-XC (Extreme Conditions) CPUs without additional verification. Contact us for confirmation.
Selection Guide
Use the following criteria to determine if the RLM02 is the right module for your project:
- Step 1 — Identify your CPU: Confirm your AC500 CPU model supports hardware redundancy via RLM02 (check ABB System Catalog or contact us)
- Step 2 — Redundancy topology: RLM02 supports 1:1 hot-standby CPU pairing; for N:M redundancy, evaluate ABB’s network-level solutions
- Step 3 — Link medium: Confirm whether your installation requires copper or fiber redundancy link (check RLM02 variant suffix)
- Step 4 — Firmware version: Ensure Automation Builder version is compatible with RLM02 firmware revision
- Step 5 — Quantity: One RLM02 is required per CPU in the redundant pair (i.e., 2 modules per redundant system)
Not sure which module fits your system? Send us your system configuration and our engineers will advise.
Quality Assurance & Sourcing
- All modules sourced from authorized distributors or verified surplus channels
- Each unit undergoes visual inspection and functional verification prior to shipment
- Original manufacturer packaging and labels preserved where available
- Traceability documentation available upon request (batch records, test reports)
- Anti-counterfeit measures: hologram labels, serial number verification against ABB records
How to Order
- Add the ABB RLM02 to your cart and proceed to checkout
- For bulk orders (>5 units) or urgent requirements, email [email protected] for a dedicated quote
- Provide your system details (CPU model, firmware version, application) for pre-sales compatibility confirmation
- Lead time: typically 3–7 business days for in-stock units; 2–4 weeks for sourced orders
- Shipping: DHL / FedEx international express available; customs documentation provided
Replacement & Compatibility FAQ
Q: Can I use RLM01 instead of RLM02?
A: The RLM01 is an earlier revision. Compatibility depends on your CPU firmware version. We recommend using the RLM02 for all new installations. Contact us for a compatibility check.
Q: Do I need two RLM02 modules for a redundant system?
A: Yes. One RLM02 is installed in each CPU of the redundant pair, so a complete redundant system requires two modules.
Q: Is the RLM02 compatible with AC500 V3 CPUs?
A: AC500 V3 CPUs (PM5650, PM5670, etc.) use a different redundancy architecture. Please contact us to confirm compatibility before ordering.
Q: Can Konmask provide a certificate of conformity?
A: Yes. Certificates of conformity and inspection reports are available upon request for all orders.
Q: What is the warranty on this module?
A: All modules sold by Konmask.com carry a 90-day functional warranty. Extended warranty options are available — contact us for details.
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