Description

ABB RLM02 (3BSE091723R1) PROFIBUS DP/FMS Bus Redundant Link Module

Basic Technical Specifications

• Model: RLM02
• ABB Part No: 3BSE091723R1
• Brand: ABB (Sweden), matched for ABB 800xA DCS & AC700F control system
• Warranty: One Year

1. Core Communication Parameters

1. Three fully isolated RS485 PROFIBUS ports
   • Port A / Port B: Redundant dual bus channels
   • Port M: Single non-redundant main bus channel
2. Baud Rate Range: 9.6 kbps ~ 12 Mbps, adjusted via front rotary DIP switch
3. Protocol: Fully transparent for PROFIBUS DP / FMS, no slave address occupation, zero configuration impact on bus topology
4. Repeater Amplification: Regenerates bus signal waveform and amplitude, extends PROFIBUS transmission distance
5. Max Nodes: Supports up to 31 PROFIBUS slaves per bus segment
6. 

2. Power & Electrical

• Supply Voltage: 24 VDC (20 ~ 33 VDC wide range), typical current 120mA, power consumption 3.6W
• Isolation: 500V AC functional isolation between A/B/M bus ports and power supply
• Alarm Output: 1 set of potential-free dry contact (max 1A load) for system fault remote alarming
• Terminal: 8-pin pluggable terminal block, wire gauge up to 1.5mm²

3. Environmental & Mechanical

• Mounting: Standard 35mm DIN rail cabinet installation
• Protection Class: IP20 (indoor control cabinet only)
• Operating Temp: 0°C ~ +55°C; Storage Temp: -30°C ~ +85°C
• Humidity: ≤75% non-condensing
• Dimension: 175.5mm (W) × 103.5mm (H) × 90mm (D), Net Weight: 0.46kg
• Certifications: CE, UL, CSA, DNV GL marine ship certification, RoHS compliant

4. Indication & Diagnosis

• Front LED array: Power status, A/B/M bus activity, line break/short circuit fault alarm
• Real-time monitoring for all three bus lines; automatic seamless failover between A and B redundant channels
• Reset button to validate baud rate parameter modification

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Product Overview

The ABB RLM02 3BSE091723R1 is a dedicated PROFIBUS redundancy conversion and bus repeater module for ABB System 800xA distributed control system, solving the compatibility problem between single-port field devices and dual redundant PROFIBUS control networksABB Group.

It has two core working modes:

1. Mode 1 (Redundancy Split): Convert 1 non-redundant M-bus into dual redundant A/B PROFIBUS lines, so ordinary single DP slave instruments, valves, analyzers can access the DCS redundant fault-tolerant network;
2. Mode 2 (Redundancy Merge): Aggregate A/B two redundant PROFIBUS master lines into one single M output line, realizing automatic hot backup of the upper controller bus.