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2-year Warranty

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Schneider Electric 140CPU43412U

Rated 4.5/5 on 5 reviews

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MANUFACTURER : Schneider Electric

DESCRIPTION: Unity Processor Modicon Quantum - 1056 Kb - 66 Mhz



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2 Year warranty

Part Number140CPU43412U
ManufacturerSchneider Electric
Model #140-CPU-434-12U
Warranty2 Year
Module formatStandard
Product or componentUnity processor
Clock frequency66 MHz
Number of slots10
Number of racks2 - local rack(s)
Number of distributed I/O station63 station(s) - 1 rack(s) - 3 distributed network(s)
Number of remote I/O station31 - 2 remote rack(s)
Discrete I/O number8000 inputs, 8000 outputs - distributed - per network
31744 inputs, 31744 outputs - remote
Unlimited (26 slots max) - local
Analogue I/O numberUnlimited (26 slots max) - local
500 inputs, 500 outputs - distributed - per network
1984 inputs,1984 outputs - remote
Application specific I/OAccurate time stamping
High-speed interrupt inputs
Serial link
Number of optional modules6 (Ethernet, Modbus, Modbus Plus, Profibus DP, Sy/Max)
Maximum number of connectionsUnlimited (AS-Interface) - local
6 (Profibus DP) - local
6 (Modbus Plus) - local
6 (Ethernet TCP/IP) - local
4 (AS-Interface) - remote
2 (Modbus) - RS232/485 Modbus/ASCII
2 (AS-Interface) - distributed
Integrated connection type1 Modbus Plus
2 Modbus
ChecksProcess control
Memory descriptionInternal RAM 1056 kB
Switch functionKey switch memory start/stop memory protection
Slide switch communication port : ASCII/RTU/Memory
Application structureNo auxiliary task
64 interrupt tasks
64 I/O interrupt tasks
16 timer interrupt tasks
1 periodic fast task
1 cyclic/periodic master task
Execution time per instruction0.12...0.585 µs on word
0.12...0.585 µs Boolean
0.1...0.27 µs on fixed-point arithmetic
0.1...0.27 µs floating points

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 140CPU43412U 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 140CPU43412U 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 140CPU43412U, 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.

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Ask about exchanging your faulty 140CPU43412U for credit when ordering from MRO Electric

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 140CPU43412U Overview

The Modicon CPU module 140CPU43412U is manufactured by Schneider Electric and is a part of the Modicon Quantum communication system. The Modicon Quantum system offers processing capabilities on your computing system. The Quantum system is a specialized system designed for real-time control necessary in manufacturing and industrial applications. The Quantum system delivers in a modular, expandable architecture using several modules such as the 140CPU43412U CPU along with the CPS, I/O modules as well as network interface modules. 


The Modicon 140CPU43412U low-end CPU module has a max internal memory of 800 kBytes. It comes equipped with a key switch. It is managed with Control Expert programming software. Hot Standby topologies are not compatible this is the control module. It has two communication ports, 2 Modbus (RS-232), 1 Modbus Plus (RS-485). The processor for the 140CPU43412U is inter 486 and the bus current required for this particular module is 1250 mA. The max combination of support modules used with this unit is 6. The clock speed is66 MHz. It has a math processor on board. 

The Modicon 140CPU43412U has unlimited I/O words and a max of 2 I/O racks. It is capable of 500 in and 500 out max words per network. The max word per Node is 30 in and 32 out with a max number of DIO drops/networks of 64. It requires a 3 V lithium battery. 


The Quantum CPU module functions as a bus master. The Bus master controls the local, remote, and distributed I/O of the entire Quantum system. Where can you use the Modicon 140CPU43412U? The Modicon 140CPU43412U is used on the Quantum I/O rack. It makes use of a programmable memory to internally store the user instruction. This is done through a digitally operating electronic system. This system allows you to implement certain functions. Some of the functions you can add specific instructions to control are logic, process sequencing, timing, coupling, and arithmetic. Digital and analog outputs use the instructions to facilitate control over various types of machines and processes. 

How to use a 140CPU43412U 

Low-end CPU modules have several common components. The model number and model description are both located at the top front of the module. Directly below the model number and description is the LED display. The battery is located below the LED on the front of the unit followed by the 140CPU43412U key switch. Under the Key switch is the area designated for the memory port and two slide switches. The two slide switches have three positions each. The top left switch is your memory protection switch. Used in the middle left the position or the bottom left position, there is no memory protection. The right slide switch is used for Comm parameter settings. There are three of them as well. The top right position is used for ASCII, the middle position is used for RTU, and the bottom right position is used for mem. Below the Memory port and slide switch, there are two connectors. The first is the Modus connector and the second is the Modbus Plus connector. There is a removable door available to cover the battery, key switch, and Modbus connectors. A label can be placed inside the cover for identification purposes. 

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.

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 140CPU43412U, 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 140CPU43412U 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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