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PROFIBUS REDUNDANCY LINK MODULE
150 MA 24 VDC
CONVERTS NON-REDUNDANT
PROFIBUS LINE TO TWO
REDUNDANT LINES OR VICE VERSA
AMPLIFIES SIGNAL FORM / AMPLITUDE
MONITORS ERROR STATUS
The RLM01 3BDZ000398R1 is a redundant link module for PROFIBUS-DP fieldbus, designed to improve the reliability and flexibility of bus communication in industrial automation systems. It is typically used in conjunction with ABB's Freelance distributed control systems.
Ring or dual-line redundant structure
Provides 3 PROFIBUS interfaces
Supports 35mm DIN rail mounting
The three RS 485 interfaces of the module support all transmission rates specified in DIN 19245 for the PROFIBUS from 9.6 kBit/s to 12 MBit/s. The module has repeater functionality, i.e., it regenerates the signal shape and the amplitude of received data. RLM01 monitors all three lines A, B and M for activity and error states. Detected errors are signalled by lit diodes on the front panel. The potential-free alarm contact activated in parallel to this can be polled for diagnostic purposes by the process control system PCS or by a programmable logic control PLC. The first data coming in over line A or line B with a correct telegram start are routed to terminal M. With simultaneity, either line A or line B is selected at random. Testing and selection is always based on the first character. In the case of a telegram start with error on A, the control logic switches to the redundant line B. The same procedure applies vice-versa for line B. Data coming in over line M with a correct telegram start are routed in parallel to the two terminals A and B. The test for data is always based on the first character. In the case of a telegram start with error, the control logic does not output any data to A and 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 RLM01 3BDZ000398R1 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.
Thermal Power Generation
Safeguards the PROFIBUS DP network between the main Distributed Control System (DCS) and decentralized boiler/turbine auxiliaries.
Oil & Gas
Provides line-redundant network topologies for critical process areas to guarantee continuous safe operations.
Chemical & Petrochemical
Connects single-interface PROFIBUS slaves to redundant fieldbus backbones under aggressive chemical processing environments.
Marine & Maritime
Fulfills DNV/GL marine standards to provide redundant network routing for ship propulsion and steering controls.
Steel Metallurgy
Prevents signal loss caused by high electromagnetic interference (EMI) around heavy foundry machinery.
Pulp & Paper
Integrates distributed non-redundant smart sensors into a fully redundant DCS architecture.
When deploying the RLM01 3BDZ000398R1 module, engineers must ensure that appropriate standard PROFIBUS bus terminators are activated at the physical ends of all three lines to prevent signal reflections and telemetry distortion. It is highly recommended to leverage the module’s dual-input terminal design by wiring redundant 24 VDC power sources to achieve seamless power supply failover. Furthermore, for maritime or offshore applications, a mandatory external 24 VDC power pack filter must be inline to maintain strict compliance with Germanischer Lloyd regulations against voltage spikes. Lastly, technicians should continuously monitor the potential-free alarm contact and front-panel LEDs for line errors to catch localized network degradation before a catastrophic dual-channel failure occurs.
How to install and deploy the RLM01 3BDZ000398R1 in a control cabinet?
It features a standard compact design and is easily mounted on a 35mm DIN rail. It should be positioned inline next to a PROFIBUS Master, or directly in front of vulnerable fieldbus segments or single-interface slaves.
Does the RLM01 3BDZ000398R1 require a specific slave address?
No, the module is completely transparent to the PROFIBUS network configuration. It does not occupy any slave addresses, making it plug-and-play without modifying existing software logic.
What transmission speeds are supported by the RLM01 3BDZ000398R1?
It supports the full spectrum of standard PROFIBUS DP/FMS transmission rates, ranging from 9.6 kbps up to 12 Mbps, with automatic baud rate detection.
How many communication ports does the RLM01 3BDZ000398R1 provide?
It features three RS-485 ports using standard 9-pin Sub-D connectors: one non-redundant Main port (M) to interface with the master/device, and two redundant line ports (A and B).
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