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The RLM02 3BSE091723R1 is a high-performance PROFIBUS Redundancy Link Module (Repeater) manufactured by ABB, designed for high-availability industrial communication networks. It provides physical layer media redundancy for standard PROFIBUS-DP networks, ensuring continuous data transmission even in the event of cable failure.
Microsecond Seamless Switchover
100% Hardware-Level Protocol Transparency
Three-Way Electrical Isolation & Signal Reshaping
The three RS-485 interfaces of the module support all transmission rates specified in IEC 61158-2 for PROFIBUS, ranging from 9.6 kbit/s to 12 Mbit/s. The module features active repeater functionality, regenerating the signal shape and amplitude of received data. RLM02 monitors all three lines (A, B, and M) for activity and error states. Detected errors are indicated via LEDs on the front panel, and a parallel potential-free alarm contact can be polled for diagnostic purposes by a Process Control System (DCS/PCS) or a Programmable Logic Controller (PLC).
The three serial RS-485 interfaces are fully isolated from each other and from the power supply. The first valid data incoming over line A or line B with a correct telegram start is immediately routed to terminal M. In case of exact simultaneity, either line A or line B is selected at random. Testing and selection are always determined by the first character. If a telegram start error is detected on line A, the internal control logic automatically switches to the redundant line B. The same procedure applies vice versa for line B.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
ABB RLM02 3BSE091723R1 PROFIBUS Redundancy Link Module Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Metallurgy & Steel
Responsible for communication link protection of blast furnace charging systems, top high-pressure water pumps, and fan drives, resisting severe onsite electromagnetic interference.
Pulp & Paper
Implements uninterrupted bus backup for single-interface multi-drive modules within the sectional multi-motor synchronous speed regulation networks of high-speed paper machines.
Oil & Gas
Deployed in unmanned pumping stations and valve rooms along pipelines to supply redundant backup communication for single-channel PROFIBUS pressure regulating valves during long-distance transit.
Thermal Power
Used to link boiler main control systems with critical single-interface electric actuators and feedwater pump drives, preventing boiler trips caused by bus line breaks.
Pharmaceutical Industry
Provisions dual-line fault tolerance for environmental monitoring smart instruments within automated central control networks of GMP-compliant sterile fermenters and multi-stage distillation columns.
When using or replacing the RLM02 (3BSE091723R1) redundancy module, first ensure that the manual baud rate rotary switches on the front panel perfectly match the actual transmission speed of the PROFIBUS network; note that any adjustments require a power cycle to take effect. Second, since the module frequently acts as the endpoint of a physical bus segment, the built-in termination resistors on the connected RS-485 bus plugs must be turned to the "ON" position. Furthermore, given its IP20 open-chassis rating, it must be installed inside a clean, dry electrical enclosure. Lastly, as a pure hardware-level repeating device, it fully supports direct hot-swapping replacement without altering upper-level DCS software configurations, provided that all wiring and rotary positions are correctly replicated.
It is a professional PROFIBUS Redundancy Link Module manufactured by ABB.
What is the core function of RLM02 3BSE091723R1?
Its core function is to seamlessly convert a single, non-redundant PROFIBUS line into two fully redundant, inter-backed RS-485 links (Line A and Line B), or to perform the reverse consolidation.
How to properly use a product like RLM02 3BSE091723R1?
Snap it onto a standard 35mm DIN rail, connect non-redundant slave devices or the master through the single port (M), connect the dual redundant bus networks via redundant ports (A and B), and wire it to a 24V DC power supply.
How does RLM02 3BSE091723R1 switch when a cable break occurs?
The module's built-in hardware logic monitors both A and B signals simultaneously; if the preferred link suffers a failure or telegram error, it automatically and seamlessly switches within microseconds, ensuring zero data transmission interruption.
What transmission speeds (baud rates) are supported by RLM02 3BSE091723R1?
It fully supports all standard baud rates defined by the PROFIBUS specification, ranging from 9.6 kbit/s up to 12 Mbit/s, which can be manually configured via the rotary switch on the front panel.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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