ABB 3BDZ000398R1 RLM01 PROFIBUS Link Module

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ABB 3BDZ000398R1 RLM01 PROFIBUS

ABB 3BDZ000398R1 RLM01 is a PROFIBUS Redundancy Link Module designed for ABB industrial automation systems. It provides PROFIBUS DP/FMS line redundancy, improving communication availability and fault tolerance in critical control networks.

Product Description

The ABB RLM01 acts as an active redundancy switch/repeater that converts a single non-redundant PROFIBUS RS-485 line into two redundant PROFIBUS lines (A/B) and can also combine redundant lines back into a single line. It allows standard PROFIBUS field devices with one communication interface to operate in redundant network architectures.

Technical Specifications

Parameter	Description
Manufacturer	ABB
Model	RLM01
Part Number	3BDZ000398R1
Product Type	PROFIBUS Redundancy Link Module
Communication Protocol	PROFIBUS DP / FMS
Interface Type	RS-485
Network Function	PROFIBUS line redundancy management
Transmission Rate	9.6 kbit/s to 12 Mbit/s
Ports	3 PROFIBUS interfaces (A, B, M)
Power Supply	24 VDC
Mounting	DIN rail mounting
Protection Class	IP20
Communication Delay	Approx. 1 bit time + 0.6 μs (A/B → M)
Typical Power Consumption	Approx. 150 mA at 24 VDC

Main Features

• PROFIBUS redundancy support
  Enables redundant PROFIBUS DP communication paths to increase system availability.
• Automatic fault switching
  Continuously monitors PROFIBUS communication activity and error conditions, switching to the backup communication line when a fault is detected.
• Transparent operation
  No PROFIBUS slave address configuration is required; the module operates transparently within the network.
• Signal regeneration and repeater function
  Amplifies and reshapes PROFIBUS signals to maintain stable communication over industrial networks.
• Diagnostic indication
  Front-panel LED indicators and diagnostic contacts provide communication and fault status information.

Application Range

ABB RLM01 is commonly used in:

• ABB Freelance DCS systems
• ABB System 800xA PROFIBUS networks
• Power generation plants
• Chemical and petrochemical facilities
• Oil & gas automation systems
• Process industries requiring high communication availability
• Redundant PROFIBUS DP fieldbus architectures

It is especially suitable where a communication interruption could cause production downtime or safety concerns.

Typical Network Application

Single PROFIBUS line → RLM01 → Dual redundant PROFIBUS A/B lines

or

Redundant PROFIBUS A/B lines → RLM01 → Single PROFIBUS device network

Conclusion

The ABB 3BDZ000398R1 RLM01 PROFIBUS Redundancy Link Module is a key communication component for building highly reliable PROFIBUS networks. With automatic redundancy switching, signal regeneration, and transparent PROFIBUS operation, it helps improve system uptime and communication reliability in industrial automation environments.