Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 140CPU4321A |
| Manufacturer | Schneider Electric |
| Product Type | CPU Module / Processor Module |
| Series | Modicon Quantum Automation Platform |
| Processor | 80486 @ 66 MHz with math coprocessor |
| Internal RAM | 896 KB |
| Program Scan Time | 0.1 – 0.5 ms / Kinstruction (LL984 logic) |
| Watchdog Timer | 250 ms |
| Local I/O Capacity | 64 Inputs / 64 Outputs |
| Distributed I/O Capacity | 30 Inputs / 32 Outputs |
| Remote I/O Capacity | 64 Inputs / 64 Outputs |
| Distributed Drops | Up to 63 |
| Remote Drops | Up to 31 |
| Communication Ports | 2 x Modbus RS232, 1 x Modbus Plus |
| Communication Module Capacity | Up to 6 NOM/NOE/CR/NMS modules |
| Battery Type | Lithium 1.2 Ah, 7 µA sustain current |
| Battery Life | Approx. 10 years |
| Bus Current Consumption | 1250 mA |
| Front Panel Switch | Key-lock switch (3 positions) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Dimensions (Approx.) | 162 x 100 x 76 mm |
| Net Weight | 0.85 kg |
| Certifications | CE, UL 508, CSA C22.2 No. 142, FM Class 1 Division 2 |
| Software Compatibility | ProWORX 32, Concept, Unity Pro |
| Origin | France |
Main Features and Advantages
High-Performance Processing and Memory Architecture: The Schneider 140CPU4321A is powered by an 80486 processor operating at 66 MHz, delivering fast deterministic execution of control logic with scan times as low as 0.1 ms per Kinstruction for LL984 logic. This processing capability ensures real-time responsiveness for demanding automation applications, including high-speed machinery control and time-critical process interlocking.
Flexible Communication and Network Integration: The 140CPU4321A provides three integrated communication ports: two Modbus RS232 serial ports for local device connectivity and one Modbus Plus port for high-speed networking. This multi-port configuration enables seamless integration with HMIs, operator panels, and distributed I/O networks. The Schneider 140CPU4321A supports up to six additional communication modules, allowing expansion with Ethernet (NOE), Modbus Plus (NOM), and other network interface options.
Comprehensive I/O Management Capabilities: The 140CPU4321A manages up to 64 local I/O words, 64/64 remote I/O, and 30/32 distributed I/O, providing extensive connectivity for field instrumentation and actuators. With support for up to 63 distributed drops and 31 remote drops, the Schneider 140CPU4321A scales effectively to accommodate large industrial installations without compromising performance.
Robust Security and Diagnostics: A key-lock switch on the front panel of the 140CPU4321A provides three position settings to prevent unauthorized or accidental program modifications. The module incorporates integrated watchdog timer (250 ms) for automatic fault detection and recovery, with diagnostic LEDs providing real-time status indication for power, communication, and fault conditions.
Proven Reliability for Legacy Installations: With an operating temperature range of 0°C to +60°C and MTBF exceeding 100,000 hours, the Schneider 140CPU4321A is built for continuous operation in demanding industrial environments. Battery-backed memory with approximately 10-year battery life preserves programs and data during power interruptions. As an original factory-original component, the 140CPU4321A is available through the MRO aftermarket as a critical spare for maintaining operational legacy Quantum systems.
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