Schneider 140CRA31908 Ethernet RIO Drop Adaptor

140CRA31908 Modicon Quantum Ethernet RIO Drop Adaptor – Complete Overview

The Schneider Electric 140CRA31908 functions as an Ethernet Remote I/O (RIO) drop adaptor within the Modicon Quantum automation platform. Specifically, this module bridges the gap between a M580 system and legacy Modicon S908 coaxial bus networks. Consequently, it enables modern Ethernet-based controllers to manage older I/O drops seamlessly.

This adaptor requires a 5 VDC rated voltage and draws 1.2 A of current. Its maximum power consumption reaches 6 W, making it an energy-efficient solution for distributed control architectures. Meanwhile, the compact design fits standard Quantum racks without additional mounting hardware.

Communication Protocols and Network Ports

The 140CRA31908 supports two widely adopted industrial protocols: EtherNet/IP and Modbus TCP. This dual-protocol capability ensures compatibility with a broad range of PLCs, HMIs, and field devices. Furthermore, it allows seamless integration into existing plant networks without major reconfiguration.

Equipped with three Ethernet ports, this adaptor offers flexible wiring options. You can use a daisy-chain loop topology to connect multiple drops sequentially. Alternatively, the S908 bus topology remains available for legacy installations. This versatility simplifies system design and reduces cabling costs.

LED Indicators and Status Monitoring

The 140CRA31908 includes four LED indicators for real-time diagnostics. First, a green/red LED shows module status (Mod Status), indicating power-on, booting, or fault conditions. Second, another green/red LED reports network communication status (Net Status), helping you verify active connections.

Additionally, a dedicated green RUN LED confirms normal operation. A red I/O LED alerts you to input/output errors. These visual cues allow technicians to quickly identify issues without using a programming terminal, thereby reducing mean time to repair (MTTR).

Environmental Ratings and Protection

Built for industrial environments, the 140CRA31908 carries an IP20 protection rating per IEC 61131-2 and IEC 60527. This rating safeguards against solid objects larger than 12.5 mm, such as tools or wires. However, it is not waterproof, so indoor installation is recommended.

The operating temperature range spans 0 to 60°C, while storage permits -40 to 85°C. Relative humidity tolerance reaches 93% without condensation. Moreover, this module operates at altitudes up to 2000 meters, making it suitable for high-elevation facilities like mines or mountain-based plants.

Certifications and Standards Compliance

The Schneider 140CRA31908 meets stringent global standards. It holds UL 508 and CSA C22.2 No 142 certifications for industrial control equipment. Additionally, it complies with IEC 61000-4-16 for electromagnetic immunity and IEC 55011 for emissions.

CE marking and C-tick approval further validate its conformity to European and Australian regulations. For hazardous locations, this adaptor is rated for Class I Division 2 environments per EN/IEC 61131-1. Therefore, you can safely install it in chemical plants or oil refineries with flammable gases.

Vibration and Mechanical Robustness

The 140CRA31908 withstands significant mechanical stress. It resists vibration with 3.5 mm constant amplitude at 0.5 to 8.4 Hz, and 1 gn constant acceleration at 8.4 to 150 Hz. This robustness ensures reliable operation near heavy machinery or compressors.

Physically, the module measures 167 mm wide and 50 mm high. Its net weight is only 0.554 kg, while the packaged weight is approximately 592 g. Such lightweight construction simplifies handling during installation and maintenance.

Installation Guidelines for the 140CRA31908

Proper setup of the 140CRA31908 ensures optimal network performance. First, insert the adaptor into an available slot in the Quantum rack. Secure it with the retaining clips to maintain grounding integrity. Next, connect the Ethernet cables to any of the three ports using standard RJ45 connectors.

For daisy-chain topology, link the first port to the upstream device and the second port to the next drop. Use the third port for temporary diagnostics or future expansion. Additionally, verify that the 5 VDC power supply delivers at least 1.2 A per module. Finally, check the LED status after power-up to confirm normal communication.

Packaging List

Each new 140CRA31908 includes the following items:

• Ethernet RIO drop adaptor module (1 unit)

• Quick start guide (printed)

• Plastic dust caps for unused ports

Note: Ethernet cables, power supplies, and configuration software are sold separately.

Shipping & Delivery
All orders ship via FedEx, UPS, or DHL within 24 hours of order confirmation. Express tracking numbers are provided upon dispatch.

Frequently Asked Questions (FAQ)

1. What is the primary function of the 140CRA31908 adaptor?
This module allows a Modicon M580 Ethernet controller to manage legacy Quantum I/O drops using the S908 coaxial bus. It essentially acts as a protocol translator and network bridge.

2. Can I use the 140CRA31908 with non-Schneider PLCs?
Yes, because it supports open protocols like EtherNet/IP and Modbus TCP. However, advanced features may require Schneider-specific configuration tools.

3. How many 140CRA31908 units can I connect in a single network?
The number depends on the master controller's capacity. Typically, a single M580 CPU supports multiple RIO drops, each with its own adaptor. Consult your CPU's user manual for exact limits.

4. What do the three Ethernet ports on the 140CRA31908 do?
Two ports are used for daisy-chain connections (in and out), while the third port serves as a service port for diagnostics or temporary device access. All ports support both EtherNet/IP and Modbus TCP.

5. Is the 140CRA31908 compatible with the Quantum 140CPU53414BC processor?
Absolutely. Both modules belong to the Modicon Quantum series and share the same backplane. The 140CRA31908 extends the I/O capabilities of the 140CPU53414BC over Ethernet.