Schneider Electric 140CPU4321A Modicon Quantum CPU Module, 486 66 MHz, 896 kB RAM

Product Overview

The Schneider Electric 140CPU4321A is a processor module from the Modicon Quantum automation platform, a rack-based PLC family that has been the control backbone of process plants, utilities and large infrastructure installations for decades. At its core is an 80486-class microprocessor running at 66 MHz with an integrated maths coprocessor, backed by 896 kB of internal RAM, which together give the 140CPU4321A the capacity to scan LL984 logic at 0.1 to 0.5 ms per thousand instructions while servicing communications and I/O transfer in the same cycle. That places it firmly in the mid-range of the Quantum processor family: considerably more capable than the entry-level CPUs, yet simpler and more economical than the high-end Unity hot-standby processors.What defines the Schneider 140CPU4321A in practice is its connectivity. The module carries two Modbus RS232 ports and one Modbus Plus port on board, and it accepts up to six additional communication modules from the NOM, NOE, CR and NMS families, so a single rack can bridge legacy serial networks, Modbus Plus peer-to-peer traffic and higher-level plant networks without external gateways. Local I/O capacity is 64 words in and 64 words out, distributed I/O supports 500 words in and 500 words out per network across up to 63 drops, and remote I/O supports 64 words in each direction over as many as 31 drops.The 140CPU4321A is engineered for sustained service rather than for the spec sheet. A 250 ms watchdog timer supervises execution, a keyed front-panel switch protects the operating mode and program from unauthorised change, and a 1.2 Ah lithium battery retains the user program and real-time clock for up to ten years of typical service. Certified to FM Class 1 Division 2, UL 508, CSA C22.2 No. 142 and CE, it is a direct drop-in for existing Quantum racks programmed under Concept or ProWORX 32.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	140CPU4321A
Manufacturer	Schneider Electric
Product Type	PLC Processor / CPU Module
Product Series	Modicon Quantum Automation Platform
Microprocessor	80486-class with integrated maths coprocessor, 66 MHz
Clock Frequency	66 MHz
Internal RAM	896 kB
Programming Software	Concept, ProWORX 32
Execution Speed	0.1…0.5 ms per 1 K instructions (LL984)
Watchdog Timer	250 ms
Clock Drift	±8 s per day
Communication Ports	1 × Modbus Plus, 2 × Modbus RS232
Max Communication Modules	6 (NOM, NOE, CR, NMS)
Local I/O Words	64 in / 64 out
Distributed I/O Words	30 in / 32 out per drop, 500 in / 500 out per network
Distributed Drops	Up to 63 per network, 3 networks
Remote I/O Words	64 in / 64 out
Remote Drops	Up to 31, 2 networks
Battery Type	Lithium, 7 µA nominal, 1.2 Ah capacity
Battery Life	Up to 10 years (program and RTC retention)
Bus Current Requirement	1250 mA from Quantum backplane
Switch Function	Key switch for operating mode control
Module Format	Standard Quantum single-slot module
Operating Temperature	0…60 °C
Storage Temperature	-40…85 °C
Relative Humidity	95 % non-condensing
Operating Altitude	Up to 5000 m
Certifications	FM Class 1 Division 2, UL 508, CSA C22.2 No. 142, CE
Net Weight	0.85 kg

Main Features and Advantages

Proven processor architecture: The Schneider Electric 140CPU4321A pairs a 66 MHz 486-class CPU with an on-board maths coprocessor, so floating-point calculations, PID loops, totalisers and scaling run natively in hardware rather than being emulated in software. Combined with 896 kB of internal RAM, that gives enough headroom for substantial continuous and sequential control programs with room left for diagnostics, alarming and recipe handling.Communication without gateways: Two Modbus RS232 ports and a Modbus Plus port are built in, covering the three connections most Quantum installations actually need: a programming terminal, an HMI or instrument link, and a peer-to-peer plant network. When a project needs more, the 140CPU4321A accepts up to six NOM, NOE, CR or NMS modules in the same rack, which turns one processor into a communication hub for serial devices, Ethernet nodes and third-party systems.Scalable I/O architecture: With 64 local I/O words, 500 distributed I/O words per network across up to 63 drops, and 31 remote drops, the 140CPU4321A covers everything from a compact single-rack machine to a geographically dispersed plant. Because distributed and remote drops are addressed over the Quantum bus, expansion does not require rewiring back to the CPU rack.Retention and security: A 250 ms watchdog detects a stalled program and forces a controlled response instead of leaving outputs frozen in an unsafe state, while the keyed front switch prevents an unauthorised or accidental change of operating mode. The 1.2 Ah lithium battery holds the user program and real-time clock through extended power outages for up to ten years, so a plant restart does not begin with a program reload.Industrial ruggedness: Certified to FM Class 1 Division 2 for hazardous locations, UL 508 and CSA C22.2 No. 142, with 4 kV contact and 8 kV air electrostatic discharge immunity and 10 V/m radiated field immunity, the 140CPU4321A meets the electromagnetic and environmental requirements of heavy process industry rather than only light manufacturing.