Schneider Electric Modicon Quantum 140CPU43412A CPU 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 large-scale PLC/DCS architectures in global heavy industry. Installed across petrochemical complexes, nuclear power stations, offshore platforms, LNG terminals, and continuous-process refineries, the Quantum rack-based system has served as the backbone of safety-critical automation since its commercial introduction in the early 1990s. Its modular backplane architecture, deterministic Modbus Plus and Ethernet I/O scanning, and compatibility with Concept, ProWORX, and Unity Pro programming environments made it the preferred platform for engineers requiring high-availability redundancy in harsh environments. The 140CPU43412A is a mid-range CPU module within this series, featuring a 486-class processor, 512 KB user RAM, and integrated Modbus Plus port, designed for standalone or hot-standby redundant configurations.

The Evolution of Modicon Quantum Architecture

The Quantum platform evolved through three distinct architectural generations. The first generation (early 1990s) introduced the 140-series backplane with Modbus Plus as the primary network, supporting CPUs such as the 140CPU11302 and 140CPU21304 with limited RAM and no integrated Ethernet. The second generation (late 1990s–2000s) expanded CPU performance with models like the 140CPU43412A, 140CPU53414A, and 140CPU65150, adding larger memory maps, faster scan cycles, and optional Ethernet TCP/IP co-processor cards. The third generation introduced the 140CPU67160 and 140CPU65160 with native 10/100 Ethernet, Unity Pro compatibility, and transparent-ready web server integration.

Compatibility across generations is constrained by backplane slot addressing, I/O map size, and software version. Concept-programmed CPUs (140CPU43412A and earlier) are not directly interchangeable with Unity Pro-native CPUs without a full project migration. Engineers maintaining legacy installations must source exact-match replacements or perform validated firmware-level substitutions. The entire Quantum 140-series has entered the end-of-commercialization and end-of-life phase, with Schneider Electric officially recommending migration to the Modicon M580 (BMEP/BMEH series) as the modern successor platform.

Modicon Quantum Full Catalog & Functionalities (SKU List)

CPU Modules

• 140CPU11302: Entry-level 486 CPU, 256 KB RAM, Modbus Plus port, Concept-compatible.
• 140CPU21304: Mid-entry CPU, 384 KB user RAM, single Modbus Plus, no Ethernet.
• 140CPU43412A: Mid-range 486 CPU, 512 KB RAM, Modbus Plus, hot-standby capable.
• 140CPU53414A: Enhanced CPU, 1 MB RAM, dual Modbus Plus, extended I/O map.
• 140CPU65150: High-performance CPU, 2 MB RAM, integrated 10 Mbps Ethernet TCP/IP.
• 140CPU65160: Advanced CPU, 4 MB RAM, 10/100 Ethernet, Unity Pro native.
• 140CPU67160: Top-tier Quantum CPU, 7 MB RAM, dual Ethernet, web server, SFB support.

Discrete Input Modules (DI)

• 140DAI34000: 32-channel 24 VDC discrete input, sink/source compatible.
• 140DAI54000: 16-channel 115 VAC discrete input, isolated.
• 140DAI74000: 32-channel 24 VDC discrete input, high-density, LED status.

Discrete Output Modules (DO)

• 140DAO84000: 32-channel 24 VDC discrete output, 0.5 A per channel, source type.
• 140DAO84010: 32-channel 24 VDC discrete output, sink type, short-circuit protection.

Analog Input/Output Modules (AI/AO)

• 140ACI04000: 8-channel analog current input, 4–20 mA, 12-bit resolution.
• 140AVI03000: 8-channel analog voltage input, ±10 V / 0–10 V selectable.
• 140ACO02000: 4-channel analog current output, 4–20 mA, 12-bit.

Power Supply Modules

• 140CPS11420: 115/230 VAC input power supply, 20 A at 5 VDC backplane output.
• 140CPS21400: 24 VDC input power supply, 20 A backplane, for DC-powered panels.
• 140CPS41400: Redundant-ready power supply, 40 A, for high-availability racks.

Communication & Network Modules

• 140NOE77100: Ethernet TCP/IP co-processor, 10/100 Mbps, Modbus TCP server.
• 140NOM21200: Modbus Plus network option module, peer-to-peer messaging.
• 140CRP93200: RIO (Remote I/O) head adapter, coaxial cable, up to 31 drops.