Schneider Electric Modicon Quantum 140CPS12420C Power Supply Module

Technical Dossier

Product Details And Specifications

Schneider Electric Modicon Quantum Series Technical Notes

The Schneider Electric Modicon Quantum platform (140-series) is one of the most widely deployed Distributed Control System (DCS) and PLC architectures in global heavy industry. Installed across petrochemical refineries, nuclear power stations, offshore oil & gas platforms, water treatment facilities, and large-scale chemical processing plants, the Quantum rack-based architecture has served as a backbone controller in safety-critical environments since the early 1990s. The 140CPS12420C is a 24 VDC input power supply module designed to power the Quantum backplane from a DC bus — a configuration common in hazardous-area installations where AC distribution is impractical or prohibited.

The Quantum platform's modular design allows engineers to configure systems with redundant CPUs, distributed I/O drops via RIO or DIO, and high-availability power supply arrangements. Its continued presence in brownfield facilities means that sourcing genuine replacement modules — particularly power supplies and CPU cards — remains a critical operational requirement for maintenance teams worldwide.

The Evolution of Modicon Quantum Architecture

The Modicon Quantum platform was introduced by Modicon (later acquired by Schneider Electric in 1994) as a successor to the Modicon 984 series. The architecture evolved through several distinct generations:

Generation 1 (Early 1990s): Initial 140-series modules introduced the standard 16-slot and 4-slot rack form factor. CPU modules such as the 140CPU11302 established the S908 RIO bus as the primary remote I/O protocol. Power supplies in this era were exclusively AC-input units.

Generation 2 (Mid-1990s to Early 2000s): Introduction of DC-input power supplies (including the CPS124xx family) to support battery-backed and DC-distribution architectures. Enhanced CPU modules (140CPU43412A, 140CPU53414A) added Modbus Plus and Ethernet connectivity. The Unity Pro programming environment began replacing Concept software.

Generation 3 (2000s–2010s): Hot-standby CPU redundancy modules (140CPU67160) and high-density I/O modules expanded the platform's use in SIL-rated safety applications. Ethernet-based remote I/O (140NOE771x1) reduced dependency on the legacy S908 coaxial bus.

Modicon Quantum Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the Modicon Quantum 140-series platform, organized by functional category:

Power Supply Modules (CPS)

140CPS12420C: 24 VDC input, 10A backplane power supply for Quantum racks — DC-bus compatible, supports hazardous-area DC distribution architectures.
140CPS11420: 115/230 VAC input, 10A backplane power supply — standard AC-fed installations, single-slot form factor.
140CPS21400: 115/230 VAC input, 20A high-capacity power supply — for fully populated 16-slot racks with high I/O density.
140CPS41400: Redundant power supply module — pairs with a second CPS unit to provide N+1 power redundancy on the backplane.

CPU / Controller Modules

140CPU11302: Entry-level Quantum CPU, 512KB user memory, S908 RIO bus master — legacy installations, limited Ethernet support.
140CPU43412A: Mid-range CPU, 1MB memory, Modbus Plus + Ethernet port — widely deployed in refinery DCS applications.
140CPU53414A: Enhanced CPU, 2MB memory, dual Ethernet, Modbus Plus — standard for Unity Pro-based programming environments.
140CPU65150: High-performance CPU, 4MB memory, dual Ethernet — suitable for large I/O configurations exceeding 64 drops.
140CPU67160: Hot-standby redundancy CPU — used in pairs for fault-tolerant control in nuclear and petrochemical SIL applications.

Digital Input Modules (DDI)

140DDI15310: 32-channel 24 VDC discrete input module — standard field wiring, sink/source compatible.
140DDI35300: 16-channel 115 VAC discrete input module — legacy AC field devices, common in older chemical plant I/O marshalling.

Digital Output Modules (DDO)

140DDO15310: 32-channel 24 VDC discrete output module, 0.5A per channel — standard actuator and solenoid valve control.
140DDO35300: 16-channel 115 VAC relay output module — high-voltage field device switching.

Analog Input / Output Modules (ACI / ACO / AVI / AVO)

140ACI04000: 8-channel 4–20 mA analog current input module — process variable acquisition for flow, pressure, and temperature transmitters.
140AVO02000: 4-channel 0–10 V analog voltage output module — setpoint transmission to variable speed drives and control valves.

Communication & Network Modules

140NOE77101: Ethernet TCP/IP network option module — Modbus TCP server/client, web server, SNMP; primary Ethernet interface for Quantum racks.
140NOE77111: Enhanced Ethernet module with I/O scanner — supports distributed I/O over Ethernet, replaces S908 RIO in modernized installations.
140NOM21200: Modbus Plus network option module — peer-to-peer communications on legacy Modbus Plus token-ring networks.

Sourcing Hard-to-Find & Obsolete Modicon Quantum Parts

All modules are shipped with full traceability documentation. Requests for bulk quantities, kitted spares packages, or long-term supply agreements are handled directly by the DriveKNMS technical sales team.

Quality Control for the Modicon Quantum Range

Quantum-series modules present specific test challenges due to their backplane bus architecture and multi-slot communication protocols. DriveKNMS applies the following verification procedures to all 140-series modules prior to dispatch:

Power Supply Modules (140CPS family): Input voltage range verification across rated tolerance bands (±10%). Output voltage regulation testing under no-load, 50%, and full-load conditions. Inrush current measurement and soft-start circuit validation. Thermal cycling under load to identify capacitor degradation in aged units.

CPU Modules: Firmware version identification and documentation. Memory integrity check via Unity Pro or Concept diagnostic routines. S908 RIO bus master communication test using a reference rack. Ethernet port link negotiation and Modbus TCP response verification.

I/O Modules: Channel-by-channel functional test using calibrated signal sources and loads. Isolation resistance measurement between field-side and backplane-side circuits. LED indicator verification for channel status and fault reporting.

Communication Modules: Network protocol handshake testing (Modbus TCP, Modbus Plus token-pass). Firmware version logging against known-good reference builds.