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2-year Warranty

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Schneider Electric 140CPU43412A

Rated 5/5 on 83 reviews

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MANUFACTURER: Schneider Electric 

DESCRIPTION: Modicon Processor 486K RAM 2MEG 2xMB, 1xMB


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2 Year warranty

Part Number140CPU43412A
ManufacturerSchneider Electric
Model #140-CPU-434-12A
Warranty2 Year
Range of productModicon Quantum automation platform
Product or componentProcessor
Software nameConcept
ProWORX 32
Processor name80486
Mathematical coprocessorWith
Clock frequency66 MHz
Memory descriptionInternal RAM 896 kB
Exact time for 1 Kinstruction0.1...0.5 ms LL984
Watchdog timer250 ms
Clock drift+/-8 s/day at 0...60 °C
I/O words64 I/64 O remote
64 I/64 O max local
30 I/32 O distributed
I/O words/network500 I/500 O distributed
Drops/Network63 distributed
Number of drops31 remote
Number of network3 distributed
2 remote
Battery typeLithium 7 µA 210 µA
Battery capacity1.2 AH
Battery life10 yr
Number of port2 Modbus RS232
1 Modbus Plus
Communication module processor6 NOM, NOE, CR, NMS
Switch functionKey switch
Bus current requirement1250 mA
Module formatStandard

Our Repair Services

MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed 140CPU43412A to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this 140CPU43412A we also repair drives, motors, PLCs and more, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty 140CPU43412A, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

  • Shipping Weight : 2lbs

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Ask about exchanging your faulty 140CPU43412A for credit when ordering from MRO Electric

Can a PLC programmed with ProWORX NxT support a 140CPU43412A with the latest firmware?

  • Both the Concept (IEC & 984) and ProWORX PLCs are supported by the q5rv144e.bin file.

What is the replacement for the 140CPU43412A?

  • The replacement for the 140CPU43412A is the 140CPU43412U.

Why is the Quantum Unity PLC 140CPU43412A’s timer resetting on a power cycle?

  • The timer resets on a power cycle because the customer has made a Project Backup. When a Project backup is made, every power cycle will result in a cold restart (%S0). This cold restart will reset all timers.

Is it possible to upgrade a 140CPU43412 [non A] from Concept to Control Expert (formerly Unity Pro)?

  • No. Only the 140CPU43412A with a PV:04 or greater can be upgraded to support Control Expert (formerly Unity Pro.)
MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Schneider Electric 140CPU43412A Overview

Schneider Electric products are manufactured in France and are designed for Material handling, packaging, and textile machines usage. They come with a 2-year warranty from MRO Electric. We also carry CPUs from other manufacturers such as Modicon and ABB.

Schneider Electric 140CPU43412A Processor 

The Schneider Electric 140CPU43412A is a powerful processor designed for the Modicon Quantum automation platform. As part of the CPUs (Central Processing Units) category, this processor serves as the brain of the automation system, executing tasks and managing critical industrial processes. With its robust 80486 processor and a clock frequency of 66 MHz, the 140CPU43412A delivers high-speed data processing, enabling efficient control and monitoring of industrial applications.

Reliable Processing Power:

At the heart of the 140CPU43412A lies an 80486 processor, a widely recognized and capable CPU architecture known for its reliability and performance. With a clock frequency of 66 MHz, this processor can handle complex instructions and data calculations swiftly, ensuring that industrial processes run smoothly and efficiently. Whether it's handling real-time control tasks or executing complex algorithms, the 140CPU43412A provides the processing power needed to tackle demanding automation challenges.

Comprehensive Memory Capacity:

The 140CPU43412A comes equipped with 896 kB of internal RAM, providing ample memory for storing data and program instructions. This generous memory capacity allows for the efficient execution of control programs, data storage, and multitasking, enabling users to develop sophisticated automation applications. With Concept and ProWORX 32 software support, users can create and manage programs with ease, optimizing the performance of their automation systems.

Versatile I/O Configuration:

The processor offers flexible I/O configurations to accommodate various industrial setups. With up to 64 inputs and 64 outputs in remote configurations, 64 inputs and 64 outputs in local configurations, and 30 inputs and 32 outputs in distributed configurations, the 140CPU43412A provides users with the versatility to address diverse application requirements. Additionally, the processor supports up to 500 distributed I/O words on the network, enhancing its connectivity and integration with remote devices and modules.

Reliable Communication Options:

The 140CPU43412A features two Modbus RS232 ports and one Modbus Plus port, enabling seamless communication with a wide range of devices and systems. These communication options facilitate data exchange and coordination among different components within the automation network, enhancing overall system efficiency and control. With support for communication module processors such as NOM, NOE, CR, and NMS, the processor offers flexibility for network configuration and expansion.

Robust Watchdog Timer and Clock Drift:

For enhanced system reliability, the 140CPU43412A incorporates a watchdog timer with a 250 ms timeout period. The watchdog timer monitors the processor's operation, ensuring that it resets in case of any malfunction or failure, thereby preventing critical system crashes. Moreover, the processor maintains precise timekeeping with a clock drift of +/-8 seconds per day at 0 to 60°C, providing accurate timestamps for events and data logging.

Long-Lasting Battery Life:

The processor is equipped with a lithium battery with a capacity of 1.2 AH, delivering a battery life of up to 10 years. This long-lasting battery ensures that critical data and program configurations remain intact even during power outages or system shutdowns. The battery's low power consumption of 7 µA to 210 µA further contributes to prolonged life and reduced maintenance requirements.

Durable and User-Friendly Design:

The 140CPU43412A boasts a rugged and reliable construction, making it suitable for demanding industrial environments. Its standard module format allows for easy installation and integration into control panels and enclosures. The processor features a key switch for switching functions, providing an added layer of security for system configuration and operation. Additionally, the CE marking certifies compliance with European safety and regulatory standards.


The Schneider Electric 140CPU43412A is a high-performance processor designed to deliver reliable and efficient control for the Modicon Quantum automation platform. With its powerful 80486 processor, versatile I/O configurations, robust communication options, and comprehensive memory capacity, this processor enables users to build sophisticated automation applications to tackle complex industrial challenges. The 140CPU43412A's long-lasting battery life, watchdog timer, and accurate timekeeping further enhance system reliability and uptime. As a part of Schneider Electric's commitment to quality and innovation, the 140CPU43412A stands as a trusted solution for industrial automation, empowering users with advanced control and monitoring capabilities.

Contact Us Today For More Information About Schneider Electric Products

Check out the rest of our Schneider Electric product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 140CPU43412A, take a look at more from our CPUs line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 140CPU43412A products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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