Still Running a Modicon Quantum System That Schneider No Longer Sells?
If your plant depends on Modicon Quantum I/O, you already know the problem. The 140CRP31200 reached end of sale on 2018-12-31, yet the process line it controls still runs every day. Waiting weeks for a replacement is not an option when production is on the line.
The 140CRP31200 is a Schneider Electric Ethernet RIO head-end module for the Modicon Quantum platform. It acts as the Ethernet RIO master (non-S908) inside the controller rack, linking the CPU to remote I/O drops over a daisy-chain ring topology. One slot in the backplane is all it needs.
What the 140CRP31200 Does in Your Rack
The module draws 5 V DC from the Quantum backplane and consumes 750 mA of bus current. That single-slot footprint keeps rack space free for other modules while handling the entire remote I/O communication path.
Its daisy-chain ring topology is the practical detail that matters most on site. Each drop connects to the next, and the ring returns to the head-end module. This design keeps remote I/O communication resilient in large plants where cable runs stretch across several buildings.
The 140CRP31200 pairs with the 140CRA31200 remote adapter as its compatible slave. If you are rebuilding a drop, confirm both ends of the link before you order, because the head-end and adapter must match.
Key Parameters
| Specification | Value |
|---|---|
| Communication type | Ethernet RIO master (non-S908) |
| Topology | Daisy-chain ring |
| Compatible slave | 140CRA31200 |
| Slots required | 1 |
| Supply voltage | 5 V DC (backplane) |
| Bus current | 750 mA @ 5 V DC |
| Protection rating | IP20 |
| Dimensions (H×W×D) | 250 × 40.34 × 103.85 mm |
| Weight | 0.3 kg |
Where This Module Earns Its Keep
Oil and gas facilities often run Quantum racks in remote pump stations, tank farms, and pipeline monitoring cabinets. The daisy-chain ring lets engineers extend Ethernet RIO across long distances without a separate switch at every drop.
Water treatment and power generation plants use the same architecture. A single 140CRP31200 can supervise multiple remote drops, which reduces the number of head-end modules needed per rack.
Because the module is IP20 rated, it belongs inside a clean control cabinet. Keep it away from washdown areas and direct dust exposure.
Replacement and Upgrade Guidance
With end of sale in 2018, the practical question is not whether to replace, but how to keep the line running while you plan. Many operators stock a spare 140CRP31200 so a failed module does not stop production.
When you install a replacement, power down the rack and follow your site’s lockout procedure. Match the slot position of the original module. After power-up, verify that every remote drop on the ring reports correctly before returning the line to service.
If you are considering a migration to a newer platform, treat this as a planned project rather than an emergency swap. Run the existing Quantum system with verified spares until the migration window opens.
Integration Notes
The 140CRP31200 communicates over Ethernet RIO, not a general-purpose fieldbus. Wiring into this network may require specific cables and connection hardware. Confirm cable types, ring termination, and any gateway needs with your supplier before installation.
Selection Checklist
Before you buy, confirm the module is a 140CRP31200 and not a different Quantum head-end variant. Check that your remote drops use the 140CRA31200 adapter. Verify your rack has one free slot and that the backplane can supply 750 mA at 5 V DC to this module.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Oil AutoTech supplies fast-dispatch spares for oil, gas and industrial automation, with quick worldwide delivery and hands-on technical selection help.
Frequently Asked Questions
Is the 140CRP31200 still available?
Schneider Electric ended sales on 2018-12-31. Availability now depends on remaining stock and the secondary market. Contact Oil AutoTech for current stock and pricing.
Which remote adapter works with this module?
The compatible slave is the 140CRA31200. Use that adapter at each remote drop on the ring.
How much backplane current does it draw?
The module draws 750 mA at 5 V DC from the Quantum backplane.
Can I use it outside a control cabinet?
No. The protection rating is IP20, so it must be installed inside a protected enclosure.
What topology does the Ethernet RIO network use?
It uses a daisy-chain ring topology, with the ring returning to the head-end module.
