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Overview of the Redundancy Link Module RLM02 for PROFIBUS Networks
The Redundancy Link Module RLM02 is designed to integrate field devices with a single PROFIBUS DP interface into a redundant PROFIBUS network. By converting a non-redundant PROFIBUS line into two redundant RS485 lines or vice versa, the RLM02 enhances network reliability and flexibility. This module can be positioned at various points within the network, such as directly after a master, before a bus segment with multiple slaves, or in front of an individual slave.
Key Features and Functionality
Key Features:
- Three PROFIBUS Ports: Allows for conversion between non-redundant and redundant lines.
- Transparent Configuration: No need for a slave address.
- Transmission Rates: Supports from 9.6 kbit/s to 12 Mbit/s.
- Capacity: Each interface can serve up to 31 PROFIBUS stations, expandable with repeaters and media converters.
- Diagnostic Indicators: LEDs and signaling contacts for error and status monitoring.
- Certifications: CE, UL, CSA, and DNV GL Type Approval for marine use.
- Power Supply: Redundant 24 VDC power supply for increased reliability.
Detailed Functionality:
- Conversion and Redundancy:
- Converts a single, non-redundant PROFIBUS line into two redundant lines (A/B) or vice versa.
- Ensures automatic line selection and maintains communication monitoring.
- Acts as a repeater to amplify signal form and amplitude.
- Line Monitoring and Error Handling:
- Monitors all three lines for activity and faults.
- Uses LEDs and signaling contacts to indicate and report errors.
- Suitable messages for diagnostics can be accessed via the 8-pin terminal strip.
- Combining Redundant Lines:
- Data arriving first from line A or B is forwarded to the M connection.
- In case of simultaneous data arrival, line A or B is randomly selected.
- On detecting an error in line A, the control logic switches to line B, and vice versa.
- Splitting a Non-Redundant Line:
- Data arriving at connection M is passed to both A and B lines if the start of frame is correct.
- If the start of frame is incorrect, no data is output to A and B.
- Power Supply and Assembly:
- Redundant power supply ensures continuous operation with 24 VDC.
- Easy DIN rail mounting.
- Power supply monitoring reports any malfunctions through signaling contacts.
Application Scenarios
- Directly After Master: Enhances redundancy immediately after the master station to protect the central control.
- Before Bus Segment with Multiple Slaves: Ensures that a segment with multiple slaves benefits from redundant communication paths.
- In Front of Individual Slaves: Protects critical single slaves by providing them redundant communication lines.
Integration and Usage
- For Single Interface Stations: Assign these stations to either line A or B as needed.
- Expanding Network: Use repeaters and media converters to extend PROFIBUS lines and add more stations beyond the 31-station limit per interface.
Summary
The RLM02 is a vital component for enhancing the reliability and redundancy of PROFIBUS networks, especially in applications requiring high availability and fault tolerance. Its ability to convert, monitor, and manage redundant lines makes it suitable for various industrial applications, including those in harsh or marine environments.
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