Description
1. At-A-Glance Executive Brief
- Model: RLM01 (3BDZ000398R1)
- Brand: ABB
- Part Type: PROFIBUS Redundancy Link Module
- Lifecycle Status: Active / Legacy Industrial Fieldbus Support
- Weight: 0.33 kg
- Core Protocol: PROFIBUS DP / FMS (RS-485)
2. Technical Introduction
Communication dropouts on single-line fieldbus segments can disable entire automation nodes, risking unplanned process shutdowns in continuous manufacturing environments.
The RLM01 acts as an active switching node, seamlessly converting a non-redundant PROFIBUS line into two redundant RS-485 lines (or vice versa) to maintain continuous data flow across critical plant networks.
3. Core Technical Specifications
| Parameter | Value |
| Product ID / Part Number | 3BDZ000398R1 (RLM01) |
| Transmission Rate | 9.6 kBit/s to 12 MBit/s |
| Interface Type | RS-485 via 9-pin Sub-D connectors (Ports A, B, M) |
| Operating Voltage | 24 V DC (+20% to +33%) |
| Power Consumption | Typically 150 mA at 24 V DC |
| Electrical Isolation | Functional isolation to VDE 0110 (500 Veff test voltage) |
| Alarm Contact Rating | Max. 60 V DC, Max. 1 A (Opens on error) |
| Enclosure & Mounting | IP20 / 35 mm DIN mounting rail |
4. Field Engineer’s Tech Notes
- Sub-D Termination Resistors: When wiring redundant lines A and B into the 9-pin Sub-D ports, ensure that external termination active biasing is correctly maintained at the extreme ends of the physical cable run. Improper termination impedance will distort RS-485 waveform amplitudes, causing the RLM01 internal logic to falsely toggle between redundant paths.
- Alarm Contact Integration: Always wire the 8-pin terminal strip alarm contact into your PLC digital input or control room Annunciator system. Because the contact stays closed during normal operation and opens upon detecting a line fault or power rail drop, it provides immediate local indication of single-path degradation before total network failure occurs.
5. Adaptive QA & Testing Protocol
Before inventory release, every RLM01 module undergoes protocol handshake verification using an active PROFIBUS DP test master simulator. Technicians verify data telegram pass-through performance across ports A, B, and M at multiple baud rates ranging from 9.6 kBit/s up to 12 MBit/s. Power supply switching thresholds are tested under load, and the onboard error-signaling relay contact is verified for proper open/closed state transitions. Diagnostic test logs and verification reports are available upon request to plant instrumentation leads.
6. Buyer’s FAQ
- What is the standard warranty length for this redundancy module? All units carry a 12-month replacement warranty covering component defects from the date of invoice.
- Is this part supplied as New Surplus or factory original? Inventory options feature factory-certified New Surplus (NSFP) and rigorously tested pre-owned hardware preserved in anti-static packaging.
- How fast can this item ship to address an urgent plant outage? Emergency same-day fulfillment and expedited global air freight choices are available to reduce downtime windows.
- Does the RLM01 require a unique PROFIBUS slave address configuration? No, the module is completely transparent to the PROFIBUS configuration
