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ABB RMBA-01 Adapter Module 

1. Key Parameters

• Product Model: RMBA-01 (standard identifier for Relion series adapter modules)
• Core Function: Interface adaptation between Relion protection devices (e.g., REF615, REX640) and external systems; supports protocol conversion and I/O expansion
• Supported Interfaces:
  • Communication: RS-485 (Modbus RTU), Ethernet (10/100Mbps, optional via add-on port)
  • I/O Expansion: 4 digital inputs, 2 digital outputs (dry contacts)
• Protocol Support: Modbus RTU (master/slave mode), ABB proprietary SPA bus (for Relion system integration)
• Data Transfer Rate: Up to 115.2kbps (RS-485); 100Mbps (Ethernet, if equipped)
• Isolation Level: 2.5kVrms (communication interfaces to power supply; I/O to backplane)
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤3W
• Operating Temperature Range: -25℃~+70℃ (-13℉~158℉)
• Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
• Mounting Method: Direct mounting on Relion device backplane (compatible with Relion 615/620/630 series enclosures); 35mm DIN rail mounting (optional with adapter bracket)
• Protection Class: IP20 (module body); Complies with IEC 61010-1 (safety), IEC 61000-6-2 (EMC immunity)

2. Product Features

• Seamless Relion Integration: Specifically designed for ABB Relion series protection and control devices, ensuring plug-and-play compatibility with no additional wiring modifications—simplifying system expansion.
• Dual Communication Modes: Supports RS-485 (Modbus RTU) for legacy system connectivity and optional Ethernet for high-speed data exchange, enabling flexible integration with SCADA, DCS, or substation automation systems.
• I/O Expansion Capability: Adds 4 digital inputs and 2 digital outputs to extend the Relion device’s control capabilities, accommodating additional sensors, actuators, or interlocking signals in complex power systems.
• Robust Isolation: 2.5kVrms galvanic isolation between interfaces and power supply eliminates ground loops and electromagnetic interference (EMI) from nearby high-voltage equipment, ensuring stable data transmission.
• Compact Design: Slim profile minimizes space requirements in control cabinets, ideal for substation environments with dense equipment layouts.
• Industrial Durability: Wide temperature tolerance (-25℃~+70℃) and anti-vibration performance (IEC 60068-2-6) withstand harsh conditions in outdoor substations, industrial plants, and renewable energy facilities.
• Easy Configuration: Configurable via ABB PCM600 software (same platform as Relion devices), allowing parameter setting, protocol mapping, and I/O logic programming without specialized tools.

3. Application Fields

• Substation Automation: Extends communication capabilities of Relion protection devices (e.g., feeder protection, transformer protection) to connect with SCADA systems or remote terminal units (RTUs) in medium-voltage substations.
• Industrial Power Distribution: Enables Relion devices to interface with PLCs or DCS systems in manufacturing plants, steel mills, and chemical facilities—facilitating centralized monitoring of power distribution networks.
• Renewable Energy Integration: Connects Relion-based protection systems in solar farms or wind parks to energy management systems (EMS), supporting data exchange for grid compliance and performance optimization.
• Critical Infrastructure: Enhances connectivity for power protection systems in hospitals, data centers, and airports—integrating with building management systems (BMS) for coordinated power control and fault response.
• Legacy System Upgrades: Acts as a protocol converter to link modern Relion devices with older equipment using Modbus RTU, avoiding costly replacement of existing infrastructure during automation upgrades.

4. Precautions

• Device Compatibility: Ensure compatibility with specific Relion series models (e.g., REF615, REX640) as listed in ABB’s technical documentation—non-compatible devices may cause communication failures.
• Protocol Configuration: When setting up Modbus RTU, verify baud rate, parity, and address match between the RMBA-01 and connected devices; mismatched parameters will disrupt data transmission.
• Wiring Practices: Use shielded twisted-pair cables for RS-485/Ethernet connections; ground cable shields at a single point to minimize EMI from high-voltage power lines or switchgear.
• Power Supply Stability: Connect to a regulated 24V DC power supply with surge protection to prevent voltage fluctuations that may affect communication or I/O operation.
• Environmental Limits: Avoid installation in areas with condensation, corrosive gases, or extreme temperatures beyond -25℃~+70℃; use climate-controlled enclosures in harsh outdoor environments.
• Software Compatibility: Ensure PCM600 software is updated to the latest version to support RMBA-01 configuration; outdated software may lack necessary drivers or configuration tools

The structure and details of the product：

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