Schneider 140CRA21220C DIO Drop Interface

The Schneider Electric 140CRA21220C is a Distributed I/O (DIO) Drop Interface Module designed for use with the Modicon Quantum automation platform. Operating over the S908 Remote I/O (RIO) network, this module serves as a critical communication interface that links a central Quantum CPU to distributed remote I/O devices.

Designed for high-performance and reliability, the 140CRA21220C facilitates decentralized control architectures where I/O modules can be physically separated from the CPU but function seamlessly as part of the same system. This makes it particularly well-suited for large-scale industrial operations, such as chemical processing, energy generation, water utilities, and infrastructure control systems.

Compact and robust, this module supports fast and efficient communication, ease of integration with Schneider’s Unity Pro (now EcoStruxure Control Expert), and long-term stability under demanding environmental conditions.

Technical Specifications

Product Applications

The 140CRA21220C plays a vital role in remote automation setups by allowing remote input/output (I/O) stations to interface seamlessly with a central controller. This modular design is especially beneficial in environments that require:

• Remote Monitoring and Control

  Plants where equipment is distributed across long distances, such as in refineries, chemical processing plants, or water treatment facilities.

• Power Generation Facilities

  Linking auxiliary control equipment (e.g., turbine controls, switchgear panels) to central PLCs for coordinated operation.

• Oil and Gas Operations

  Ideal for remote wellhead monitoring, offshore rig automation, and compressor stations.

• Automated Manufacturing

  Used in large assembly lines and robotic cells where I/O modules are separated across production zones.

• Food and Beverage Industry

  Connecting distributed conveyors, sensors, and filling machines for centralized control and monitoring.

• Transportation and Infrastructure

  Deployed in tunnel control systems, ventilation monitoring, and smart building automation.

Key Advantages

• Remote Connectivity

  Allows I/O modules to be located close to field devices, significantly reducing wiring cost and complexity.

• High-Speed Communication

  S908 RIO protocol supports real-time data transfer up to 1.5 Mbps, ensuring fast and synchronized operations.

• Reliable Industrial Design

  Built to operate in harsh environments, with wide temperature tolerance and high vibration resistance.

• Ease of Integration

  Compatible with Schneider’s Unity Pro / EcoStruxure Control Expert for seamless software configuration.

• Diagnostics & Status Feedback

  LED indicators and software diagnostics simplify maintenance and troubleshooting.

• Compact Form Factor

  Small footprint allows installation in space-constrained panels without sacrificing performance.

• Scalability

  Facilitates easy system expansion by allowing additional remote I/O stations as needed.

Frequently Asked Questions (FAQ)

1. What is the function of the 140CRA21220C module?

It connects a Modicon Quantum CPU to a remote I/O drop via the S908 network.

2. Is the module compatible with all Quantum CPUs?

Yes, any Quantum CPU that supports RIO/S908 communication can interface with this module.

3. What communication medium does it use?

It uses 75 Ohm coaxial cables terminated with BNC connectors.

4. How many drops can one module support?

One module supports a single drop. For additional drops, more modules must be used.

5. Is redundancy supported by this module?

While the module itself does not support redundancy, redundant configurations are possible with supporting architecture.

6. What is the recommended software for configuration?

Unity Pro or EcoStruxure Control Expert.

7. Can this module be hot-swapped?

No, it should only be inserted or removed when the rack is powered off.

8. What kind of status feedback does it offer?

It provides LED indicators for module status, I/O communication, and errors.

9. Does the module support hazardous area installation?

Yes, it holds ATEX and other certifications suitable for industrial zones.

10. How is the module powered?

It draws 5 V DC power from the Quantum backplane.