Schneider Electric Modicon Quantum 140CPU4321A Processor Module

Technical Dossier

Product Details And Specifications

Schneider Electric Modicon Quantum Series Technical Notes

The Evolution of Modicon Quantum Architecture

The Modicon Quantum platform was introduced by Schneider Electric (then AEG Modicon, later acquired by Schneider) in the early 1990s as a successor to the Modicon 984 series. The architecture was built around the VMEbus-derived S908 backplane, supporting up to 16 slots per local rack and extended I/O drops via RIO (Remote I/O) coaxial cable or Ethernet-based distributed I/O. Early CPU generations — including the 140CPU11302 and 140CPU11303 — offered limited memory (256KB–512KB) and single-port Modbus communication. Mid-generation processors such as the 140CPU43412A and 140CPU4321A introduced expanded RAM (up to 1MB user logic), dual Modbus ports, and integrated Modbus Plus (MB+) networking, enabling peer-to-peer communication across plant-wide control networks without a dedicated communication coprocessor. Later high-end variants — the 140CPU65150, 140CPU65160, and 140CPU67160 — added Ethernet TCP/IP ports, Unity Pro programming environment compatibility, and support for Transparent Ready web services. The platform's final evolution introduced the Hot Standby CPU pairs (140CPU67160 / 140CPU67261) for fully redundant control architectures. Schneider Electric officially announced end-of-sale for the majority of Quantum hardware in 2019–2021, with end-of-support timelines extending to 2030 for select models. Migration paths lead to the Modicon M580 (ePAC) platform, which uses standard Ethernet backplane (BMENOC) architecture. However, the capital cost and engineering effort of full platform migration means the Quantum installed base will remain operational — and require spare parts support — well into the 2030s.

Modicon Quantum Full Catalog & Functionalities (SKU List)

CPU / Processor Modules

• 140CPU11302: Entry-level CPU, 256KB user memory, single Modbus port, no MB+
• 140CPU11303: Entry-level CPU, 512KB user memory, enhanced scan performance
• 140CPU43412A: Mid-range CPU, 1MB RAM, dual Modbus, Modbus Plus port
• 140CPU4321A: Mid-range CPU, 1MB user logic RAM, dual Modbus RS-232/RS-485, MB+ integrated
• 140CPU53414A: Enhanced CPU, 2MB RAM, dual Modbus Plus, extended I/O capacity
• 140CPU65150: High-end CPU, Ethernet TCP/IP, Unity Pro compatible, 4MB RAM
• 140CPU65160: High-end CPU, dual Ethernet, Modbus Plus, 7MB RAM, web server
• 140CPU67160: Hot Standby primary CPU, dual Ethernet, 7MB RAM, HSB link port
• 140CPU67261: Hot Standby primary CPU, enhanced diagnostics, Unity Pro, 14MB RAM

Discrete Input / Output Modules

• 140DDI35300: 32-channel 24VDC discrete input module, sink/source compatible
• 140DDO35300: 32-channel 24VDC discrete output module, 0.5A per channel
• 140DAI54000: 16-channel 115VAC discrete input module, isolated
• 140DAO84000: 8-channel 115/230VAC discrete output module, relay contact

Analog Input / Output Modules

• 140ACI04000: 4-channel analog current input, 4–20mA, 12-bit resolution
• 140AVI03000: 4-channel analog voltage input, ±10V / 0–10V selectable
• 140ACO02000: 2-channel analog current output, 4–20mA, 12-bit
• 140ARI03010: 4-channel RTD/thermocouple input, Pt100/Pt1000 compatible

Communication & Network Adapters

• 140NOE77100: Ethernet TCP/IP network option module, 10/100 Mbps, Modbus TCP
• 140NOE77101: Ethernet module with web server, FTP, SNMP, Transparent Ready
• 140NOM21200: Modbus Plus network option module, dual MB+ ports
• 140CRP93200: RIO head adapter, S908 remote I/O coaxial drop controller
• 140CRA93200: RIO remote adapter, S908 coaxial, for remote rack I/O drops

Power Supply Modules

• 140CPS11420: 115/230VAC input power supply, 3.5A @ 5VDC backplane output
• 140CPS21400: 24VDC input power supply, 6A @ 5VDC, for DC-powered panels
• 140CPS41400: Redundant power supply module, 115/230VAC, HSB-compatible rack