ABB 3BSE091723R1 RLM02 is a dedicated PROFIBUS DP/FMS redundancy link module designed for ABB AC700F and System 800xA DCS platforms, solving the networking problem of single-port field devices in dual redundant PROFIBUS bus architecturesABB Group. As an active bus switching repeater, the ABB 3BSE091723R1 RLM02 realizes bidirectional conversion between single PROFIBUS line and dual redundant RS485 bus lines, enabling non-redundant instruments, drives and I/O modules to access high-availability redundant control networks. With built-in signal regeneration, full-line fault monitoring and electrical isolation circuits, the ABB 3BSE091723R1 RLM02 ensures bumpless bus switching upon line failure, eliminating communication breakdown risks for critical industrial control systems.

Core Product Specifications

• Brand: ABB
• Model: RLM02, Part No. 3BSE091723R1
• Availability: In Stock
• Delivery Time: Within 3 working days after payment confirmation
• Guarantee: 12 months warranty
• Condition: Brand New Original
• Input/Output: 3 independent RS485 PROFIBUS ports (A/B redundant lines + M main line); potential-free fault alarm relay output; multi-channel LED status indicator terminal block; 24VDC power supply input
• Operating Temperature: 0°C ~ +55°C operating; -40°C ~ +70°C storage; IP20 protection for cabinet installation
• Size/Weight: DIN 35mm rail mounting; dimension 134×56×70mm, net weight approx 330g
• Communication: PROFIBUS DP/FMS, baud rate 9.6 kbit/s ~ 12 Mbit/s per IEC 61158-2; each port supports up to 31 slave devices; full functional isolation (500V test voltage) between all bus channels
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Key Features & Advantages

1. Bidirectional PROFIBUS Redundancy Conversion

   Supports two working modes: convert 1 single PROFIBUS line to dual redundant A/B bus, or aggregate dual redundant bus signals into one single line. It allows ordinary single-port field equipment to join redundant DCS networks without hardware modification, greatly expanding the range of compatible field devices.

2. Automatic Fault Detection & Seamless Bus Switching

   Real-time monitors signal integrity of A, B, M three bus channels. If the active line has frame error or disconnection, the module instantly switches data transmission to the standby redundant line with zero manual intervention, avoiding control signal loss and unplanned production shutdown.

3. Repeater Signal Amplification & Complete Diagnostic Feedback

   Built-in repeater circuit reshapes and amplifies bus signals to extend PROFIBUS transmission distance. Front-panel LED array displays port running status, bus errors and power faults; isolated alarm contact uploads fault signals to upper PLC/DCS for centralized equipment diagnosis, compliant with CE, UL, DNV GL marine certification standards