Description
The Schneider Electric Modicon Quantum 140CRA31908 is a high-performance Remote I/O (RIO) drop adapter module designed for the Modicon Quantum automation platform. Operating on a rugged Ethernet-based Remote I/O (ERIO) network, this module sits in a remote expansion subsystem chassis to facilitate high-speed, deterministic communication between remote I/O modules and the central Quantum or ePAC processor.
It enables seamless dual-media topology over standard Ethernet copper or fiber architectures, providing high fault tolerance and sub-millisecond I/O scanning infrastructure for critical process industries.
Commercial Availability & Procurement
| Lifecycle and Logistics | Status & Details |
| Product Condition | New Surplus (Factory Sealed) or Refurbished (Fully tested under active ERIO chassis communication loads) |
| Warranty | 12-month comprehensive industrial warranty |
| Availability | Available in stock; typical global logistics packaging and dispatch within 24 to 48 hours |
| Pricing Note | Price is subject to market availability and current system lifecycle demand. Contact our automation hardware desk for a firm, itemized commercial quote. |
Technical Specifications
| Parameter | Specification / Value |
| Module Designation | 140CRA31908 / Ethernet RIO Drop Adapter |
| Platform Compatibility | Modicon Quantum Series |
| Network Architecture | Ethernet RIO (ERIO) over deterministic IP routing protocols |
| Physical Interfaces | 3 x RJ45 ports (10/100 Mbps auto-sensing, Full/Half Duplex) |
| Topology Support | Daisy Chain Loop (DCL), Main Ring, or Star topologies |
| Backplane Current Draw | 750 mA at 5 VDC nominal (Power supplied directly via Quantum rack) |
| Maximum Local Slots | Supports up to a 16-slot Quantum backplane footprint |
| Operating Temperature | 0 to +60 °C (+32 to +140 °F) |
| Storage Temperature | −40 to +85 °C (−40 to +185 °F) |
| Conformal Coating | Standard option variations available (verify against specific suffix) |
Port Interfacing & Ring Network Topology
Unlike legacy coax-based RIO modules, the 140CRA31908 incorporates an integrated 3-port managed switch architecture directly on the module faceplate to support modern industrial networking standards.
- Ports 1 and 2 (Interlink/Ring Ports): Used to form a highly resilient ConneXium Daisy Chain Loop (DCL) or Rapid Spanning Tree Protocol (RSTP) ring configuration. If a physical Ethernet cable within the ring breaks, the network self-heals in less than 50 milliseconds, ensuring uninterrupted data flow between the processor and the remote chassis.
- Port 3 (Service Port): A dedicated network port used for local diagnostics, firmware upgrades, or connecting field instrumentation via Modbus TCP. It can also interface directly with a local Human-Machine Interface (HMI) panel without utilizing external network switches.
Field Integration & Configuration Guardrails
When installing, migrating, or hot-swapping a 140CRA31908 module within an active automated process cell, technicians must prioritize the following field protocols:
Rotary Address Switches
The back or side panel of the 140CRA31908 contains two physical rotary switches used to define the module’s unique device identification number (IP address indexing) on the ERIO network segment.
Critical Field Note: The rotary switches must be configured to match the exact Drop ID specified in the Unity Pro / EcoStruxure Control Expert hardware configuration file prior to inserting the card. Sliding a module into an energized rack with incorrect switch settings will trigger an IP address conflict, cause a network configuration error at the main CPU, and prevent the remote I/O subsystem from initializing.
Hot-Swapping (Insertion/Extraction Under Power)
The Modicon Quantum platform officially supports Hot-Swapping for this module class. However, ensure that the adjacent I/O loops are in a safe, forced state before extracting an active adapter. Pulling the 140CRA31908 will instantly drop communication to every single discrete and analog input/output module situated in that specific remote rack, defaulting all outputs to their designated fail-safe states.
Frequently Asked Questions
Q: Can this module be used alongside older 140CRA93100 coaxial-based RIO components?
No. The 140CRA31908 operates exclusively on a modern Ethernet RIO protocol stack using standard Category 5e/6 industrial copper or fiber optic media. It cannot interface directly with legacy coaxial cable splitters, taps, or F-connector networks utilized by the obsolete 140CRA93100 series. Upgrading to this module requires a complete migration of the network transport layer and the master head-end controller interfaces.
Q: What does a flashing red “ERR” or “Mod Status” LED indicate on the front panel display?
A flashing red ERR indicator typically points to a loss of communication with the master head-end controller, a duplicate IP address conflict on the ring, or an invalid hardware configuration where the physical modules inside the rack do not match the expected software configuration matrix. Connect to the module’s diagnostic webpage via the Service Port using a standard browser to view the localized fault code table.
Q: Is it necessary to ground the shielded RJ45 connectors on this module?
Yes. To protect the high-speed Ethernet signaling pathways from Electrostatic Discharge (ESD) and Electromagnetic Interference (EMI) generated by surrounding high-voltage motor drives or switchgear, you must utilize shielded twisted-pair (STP/S-FTP) industrial Ethernet cabling. Ensure that the metallic shield of the RJ45 plug makes solid mechanical contact with the grounded metal shielding shroud of the 140CRA31908 ports.
