ABB RLM01 PROFIBUS Redundancy Link Module

Description

• Transmission Rates: 9.6 kbit/s to 12 Mbit/s (full DIN 19245 compliance)
• Interfaces: 3 × RS‑485 (9‑pin Sub‑D female); 2 for redundant lines (A/B), 1 for main line (M)
• Signal Delay: A/B → M: 11 bit‑times + 0.6 μs; M → A/B: 4 bit‑times + 0.6 μs
• Isolation: Galvanic isolation per VDE 0110; test voltage 500 V eff

Power Supply

• Input: 24 V DC (+20% to +33 V)ABB
• Current Consumption: 150 mA typical at 24 V DCABB
• Redundancy: Dual redundant power input for enhanced reliability

Mechanical & Environmental

• Mounting: DIN‑rail (EN 50022)ABB
• Dimensions: Compact industrial form factor (standard for PROFIBUS infrastructure)
• Weight: Approx. 200 g
• Operating Temperature: 0 °C to +50 °CABB
• Storage Temperature: -40 °C to +85 °C
• Humidity: 10% to 90% RH (non‑condensing)
• Protection Class: IP20 (finger‑safe)
• Terminals: 8‑pin terminal strip; wire cross‑section up to 1.5 mm²ABB

Certifications

• CE, UL, CSA certified for global industrial deploymentABB

Core Functions & Features

1. Redundancy Management

• Automatic Line Switching: Continuously monitors lines A, B, and M; automatically selects the first valid telegram from A or B to route to M
• Seamless Failover: Maintains communication without data loss during line faults or disruptions
• Repeater Functionality: Regenerates signal shape and amplitude, extending PROFIBUS network distance and improving signal integrity

2. Diagnostic & Monitoring

• LED Status Indicators: Front‑panel LEDs for power, communication activity, and fault signaling on each lineABB
• Potential‑Free Alarm Contact: Signals faults to higher‑level control systems (DCS/PLC) for centralized monitoringABB
• Power Supply Monitoring: Constantly supervises dual power inputs and alerts on anomaliesABB
• Diagnostic Messages: Detailed status data accessible via 8‑pin terminal strip for troubleshootingABB

3. Network Integration

• Device Compatibility: Integrates any single‑port PROFIBUS DP/FMS device into redundant networksABB
• Client Capacity: Serves up to 31 PROFIBUS clients; expandable with additional repeatersABB
• Signal Amplification: Boosts weak field signals for reliable long‑distance transmission
• Easy Installation: Plug‑and‑play setup; no complex configuration required for basic operationABB

Application Scenarios

• Industrial Process Automation: Redundant PROFIBUS networks in manufacturing, chemical, and pharmaceutical plants
• Power Generation & Distribution: Critical control networks in power plants and substations
• Oil & Gas Facilities: Onshore/offshore production systems requiring high network availability
• Mining & Metals: Harsh industrial environments with demanding communication reliability needs
• Water & Wastewater: SCADA systems for water treatment plants and distribution networks
• Food & Beverage: Continuous‑process manufacturing with zero‑tolerance for communication downtime
• Retrofit Projects: Upgrading legacy single‑port PROFIBUS devices to support redundant architectures

Unique Advantages

• Zero Downtime: Ensures uninterrupted communication in redundant PROFIBUS infrastructures
• Cost‑Effective: Eliminates need for dual‑port field devices, reducing hardware costs
• Signal Integrity: Improves network performance via active signal regeneration and amplification
• Simplified Architecture: Streamlines network design by centralizing redundancy management
• Global Compliance: Meets international safety and EMC standards for worldwide deployment