ABB RMIO-01C Remote I/O Module for Protection Relays

Description

RMIO-01C

The ABB RMIO-01C is a compact remote input/output module designed as an essential companion to ABB’s Relion® protection relays, providing extended I/O capabilities and communication interfaces for enhanced system integration. As a key component in modern protection systems, it expands the functionality of primary relays by adding additional digital and analog I/O points, facilitating connection to external devices, and enabling communication between the relay and other system components—eliminating the need for complex custom wiring harnesses in substation and control cabinet installations.

RMIO-01C

This module integrates seamlessly with ABB’s Relion® product family, including popular relays like the ABB RET650 and ABB REU615 HBUAEAADANB6ANN1XG, creating a cohesive protection and control ecosystem. Its plug-and-play design supports both direct mounting on relay panels and remote installation in distributed control architectures, making it suitable for both new installations and retrofit projects. What makes the ABB RMIO-01C particularly valuable is its ability to centralize I/O management, reducing cable runs in control cabinets and enabling easier system expansion when additional monitoring or control points are required.

RMIO-01C

Main features and advantages:

The ABB RMIO-01C delivers reliable I/O expansion and communication performance through a robust design that supports multiple digital inputs, digital outputs, and optional analog channels, providing flexible connectivity for diverse monitoring and control requirements. It features high-speed data transmission capabilities that ensure real-time communication with connected protection relays, maintaining the integrity of critical control signals and status information even in high-noise substation environments.

Hardware design highlights include a rugged, compact enclosure that operates reliably in temperatures ranging from -25 °C to +70° C, making it suitable for harsh industrial and substation environments. The module offers secure connection terminals with screw-type clamping for reliable wiring, and its low power consumption allows for  Intensive installation alongside other protection and control devices without additional cooling requirements. LED indicators provide clear visual status of power, communication links, and I/O activity, simplifying system monitoring and troubleshooting.

Application areas:

In modern power system protection and substation automation, seamless communication between protection relays and external devices is critical for ensuring comprehensive monitoring, control, and data exchange. These environments require reliable interface modules that can extend the input/output capabilities of protection relays, facilitate communication with external sensors and actuators, and enable integration with broader substation automation systems. Whether connecting protection relays to external control panels in utility substations, linking to auxiliary equipment in industrial power networks, or enabling remote monitoring of critical parameters in renewable energy installations, engineers need robust interface solutions that bridge the gap between primary protection devices and the wider control infrastructure.

This is where the ABB RMIO-01C excels, serving as a dedicated remote I/O module for extending the functionality of ABB’s protection relays in power system applications. In transmission substations, it connects primary protection relays to external alarm systems and control devices, ensuring critical status information is reliably transmitted. In industrial power networks, it acts as an interface between protection relays and local operator panels, enabling safe manual control while maintaining system integrity. Used in power system automation for years, the ABB RMIO-01C has proven its reliability in applications requiring secure data transmission, flexible I/O expansion, and seamless integration with ABB’s Relion® protection relays, making it a trusted choice for utilities, industrial operators, and system integrators worldwide.

Related products:

ABB RET650 – Line protection relay that integrates with the ABB RMIO-01C to extend I/O capabilities in transmission networks.

ABB REU615 HBUAEAADANB6ANN1XG – Secondary substation relay commonly paired with the ABB RMIO-01C for expanded control functions.

ABB RLM01 – Auxiliary relay module that works with the ABB RMIO-01C to implement complex interlocking logic.

ABB HMI60.1 – Local operator panel that connects to protection relays via the ABB RMIO-01C for status monitoring.

ABB PSE600 – Power supply unit that provides stable voltage to the ABB RMIO-01C in standalone installations.

ABB SPACOM S200 – Communication gateway that interfaces with the ABB RMIO-01C for SCADA system integration.

ABB CMU800 – Circuit breaker monitoring unit that sends data to protection relays through the ABB RMIO-01C.

ABB REF615 – Feeder protection relay that uses the ABB RMIO-01C to connect to external alarm systems.

Installation and maintenance:

Before installing the ABB RMIO-01C, ensure the mounting surface or DIN rail is securely fastened in the control cabinet with at least 40mm clearance around the module for wiring access and heat dissipation. Verify that the power supply matches the module’s requirements, whether powered directly from the connected protection relay or an external 24V DC source. When connecting to relays like the ABB RET650, confirm that communication parameters are properly configured for seamless data exchange, and ensure all wiring follows recommended practices for electromagnetic interference protection.

For maintenance, perform quarterly visual inspections to check for loose connections, corrosion, or dust accumulation on terminals and connectors. Use ABB’s configuration software semi-annually to verify communication status, check for firmware updates, and validate I/O signal integrity. Clean connection terminals annually using appropriate contact cleaning tools to maintain reliable signal transmission. The ABB RMIO-01C includes diagnostic indicators that provide immediate visual feedback on power status and communication health, simplifying routine checks and troubleshooting procedures.

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