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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 #140CPU43412A
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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  • Order within the next 14 hours and 46 minutes.
  • If you order between 4pm and 6pm EST, you will be charged a small rush fee.

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.

Additional Information

Schneider Electric 140CPU43412A Overview

The 140CPU43412A belongs to Modicon Quantum automation platform which has several design and working functionalities. This product is a CPU processor which has a The built in software ProWORX 32. This allows the 140CPU43412A processor to run smoothly and thoroughly. 


A great function of the 140CPU43412A is the 1.2 Ah Lithium 7 µA 210 µA battery. With its 10 year battery life this module lasts long and is very efficient within this time. It has 2 remotes networks and 3 distributed networks allowing a wide range of connection. The 140CPU43412A has 3 ports including 1 Modbus plus, 2 Modbus RS232.This module is functionally identical to the non-A version. However, If you are using the module in a Hot Standby topology, then you need to use two non-”A”models or two A models. The 140CPU43412A version has a unique flash executive. The “A” version and non-”A” flash executives are not interchangeable


One of the advantages of the 140CPU43412A is the single slide switch. The single slide switch is used to select the comm parameter settings for Modbus (RS-232) Ports. It also has a key switch which is used to protect memory from programming changes while the controller is in operation. This enables the 140CPU43412A module to be safe and secure while operating. 

One more function is the address switch. The address switch, which is comprised of two rotary switches, is located on the rear panel of the Quantum CPUs. The address switch is used for setting Modbus Plus node and Modbus port addresses. This is a great plus for users as it keeps things organized. The 140CPU43412A's processor supports up to six network modules (i.e., Modbus Plus, Ethernet, and Multi-Axis Motion option modules)  using the option module interface technique allowing flexibility and variety.. However, only two Modbus Plus modules can have full functionality, including Quantum DIO support.

How to use a Schneider Electric 140CPU43412A

The 140CPU43412A firmware supports up to six network modules (i.e., Modbus Plus, Ethernet, and Multi-Axis Motion option modules) using the option module interface technique. However, only two Modbus Plus modules can have full functionality, including Quantum DIO support.

Product Description

The 140CPU43412A is a Modicon Processor 486K RAM 2MEG 2xMB, 1xMB that is manufactured by Schneider Electric. These products are manufactured in France and are designed for Material handling, packaging, and textile machines usage. All of the products come with a 2 year warranty from MRO Electric. We also carry CPUs from other manufacturers such as Modicon and ABB.

Related 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 sending us an email 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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