Modicon AEG CPU 8K 24VDC Technical Specifications
Product Model:Modicon AEG CPU 8K 24VDC
Manufacturer:AEG/Modicon(now part of Schneider Electric)
Product Type:Programmable Logic Controller(PLC)Central Processing Unit(CPU)
Series:AEG Modicon M Series or earlier TSX Series compatible models
Program Memory:8 KB
Data Memory:2 KB
Input Voltage:24 VDC(19.2–30 V)
Power Consumption:Approximately 15 W
Digital Processing Capacity:Supports local or expansion I/O modules,typically up to 256 points
Communication Interface:1 x RS-485(supports Modbus RTU master/slave mode)
Programming Method:Ladder Logic or Instruction List(IL)via a programming tool or PC with a dedicated cable
Mounting Method:DIN rail mount(35 mm)
Operating Temperature:0°C to 55°C
Storage Temperature:-25°C to 70°C
Ingress Protection:IP20(for use in control cabinets)
Dimensions:Approximately 120×100×75 mm(W×H×D)
Real-Time Clock:Some versions include battery backup
Modicon AEG CPU 8K 24VDC Product Overview
Hey everyone,the Modicon AEG CPU 8K 24VDC we’re talking about today is a veteran of industrial automation from the 1990s!It’s not some trendy Ethernet PLC,but the core control brain of the classic Modicon series from before AEG was acquired by Schneider.
Don’t underestimate its”8KB”memory—in an era before USB flash drives,8KB of program space was more than enough to run a complete packaging line,conveyor system,or fan group control logic.This unit uses a dedicated PLC processor,not a general-purpose CPU,resulting in stable execution speed and strong anti-interference capabilities,making it particularly suitable for factory floors with complex electromagnetic environments.
The Modicon AEG CPU 8K 24VDC is typically mounted on a DIN rail and connects to AEG’s digital input(DI),digital output(DO),and analog input(AI)modules via a backplane or bus.Communication is via RS-485,using the Modbus RTU protocol.It can connect to HMIs(human-machine interfaces),inverters,and instruments to implement basic automation control.
Although Schneider’s M340 and M580 are now mainstream,this Modicon AEG CPU 8K 24VDC is still in service in many established factories.Why?Simply because it’s durable!It lasts ten years without breaking down,and programs remain intact.Replacing a new CPU is expensive,so it’s better to keep it running.
Main Features and Advantages
First,let’s talk about stability.The Modicon AEG CPU 8K 24VDC is made of solid materials,a thick circuit board,and all industrial-grade components.There’s no complex operating system,no Windows blue screens,and it can run a bare metal PLC scan cycle without crashing!You can still see it quietly working with the green lights on in steel mills,old water plants,and cement plants.
Let’s talk about compatibility.Although the AEG brand was later merged into Schneider Electric,many module pinouts,sockets,and programming logic are compatible.If you have old AEG I/O modules,pair them with this Modicon AEG CPU 8K 24VDC and your system will instantly be revived.Some customers have removed them from scrapped equipment,and we tested them and found they were working perfectly,just a dusting off and ready to go.
Although programming is”retro,”it’s also simple.Use an old programmer(such as AEG’s PGU)or a PC with a serial cable,connected to AEG ProConos or compatible software,to write ladder diagrams(LD)or instruction lists(IL).No complicated network configuration,no IP address worries;just plug in,download the program,and go.
Another advantage:low maintenance costs.If this old CPU breaks,you don’t necessarily need to replace it;many can be repaired.We have the blueprints and spare parts for the power supply circuit,memory chips,and communication chips.Isn’t it a great deal to save tens of thousands of dollars compared to replacing a complete new system?
Despite its lack of Ethernet,it’s more reliable than a new PLC in standalone,non-networked applications.No risk of hacker attacks,no system upgrade worries,just peace of mind.
The Modicon AEG CPU 8K 24VDC is a rugged and reliable programmable logic controller(PLC)CPU from the classic AEG Modicon era,designed for industrial automation tasks in legacy systems.With 8 KB of program memory and a robust 24 VDC power supply,it delivers stable performance in harsh environments such as packaging lines,conveyor systems,and utility plants.Built for simplicity and durability,it features RS-485 communication with Modbus RTU support,enabling seamless integration with HMIs,drives,and field devices.Its DIN-rail mounting,wide operating temperature range,and resistance to electrical noise make it a trusted solution for long-term deployments.Though considered a legacy product,the Modicon AEG CPU 8K 24VDC remains in active service worldwide,valued for its reliability,ease of maintenance,and cost-effective lifecycle management in aging but critical automation infrastructures.
Application areas
This Modicon AEG CPU 8K 24VDC,the main battlefield is those”old”but still making money production lines.You’ll find it on older packaging machinery,controlling feeding,sealing,and coding with unwavering accuracy for decades.In urban water supply pumping stations,it’s responsible for pump start/stop and water level interlocking,rain or shine.It’s also a common fixture in factory conveyor lines,multi-story parking garages,and air compressor group control systems.
Metallurgical auxiliary equipment,cement batching,and legacy elevator group control systems—any automation project built between the 1990s and early 2000s likely used the Modicon AEG CPU 8K 24VDC.These days,we don’t demand intelligence,we just want it to work—and it’s the least of our worries.
Selection Guide/Purchasing Recommendations
If you’re considering replacing the Modicon AEG CPU 8K 24VDC,confirm three things:
First,is your system an AEG Modicon M series?Don’t try to use a Schneider Quantum or Momentum base;they won’t match.
Second,check the firmware version and program backup method of the old CPU.Some use dedicated programmers,which may be incompatible with PC software.
Third,avoid dismantling parts with”onboard battery leakage”!A leaking battery corrodes the PCB,making it impossible to repair.
Our recommendation:Buy parts that have been functionally tested,have had their batteries reset,and have their programs cleared to ensure they’re ready to use.
Customer Case Study/Successful Application Analysis
Last year,the PLC in Pump Room 2 at an old water plant in Henan suddenly crashed,halting production for two hours and disrupting water supply to half the city.Upon investigation,it was discovered that the Modicon AEG CPU 8K 24VDC had an internal battery leak and the motherboard was corroded.No one in the area knew this old brand,and the manufacturer said it had been discontinued.They contacted us,and we sent them a fully functional,tested module with a program backup service.After replacing it,the system recovered,and the customer exclaimed,”You saved the city’s water supply with this old CPU!You’re truly capable!”
Related Products
AEG Modicon M212:A small CPU from the same series with a smaller program memory footprint,suitable for stand-alone equipment.AEG Modicon M440:A model with larger memory,supporting more I/O and complex logic.
AEG KF812:A digital input module(16 points,24VDC),often used with the Modicon AEG CPU 8K 24VDC.
AEG KF822:A digital output module(16 points,relay),used to control contactors and indicator lights.
AEG KF831:An analog input module(4 channels,4–20mA),used for pressure and temperature acquisition.
AEG PGU Programming Unit:A dedicated programmer for on-site program modifications.
Schneider TSX PCX 1031:A Schneider later-compatible programming cable that can replace older PGUs.
Modicon TSX 67040:A Schneider transitional model with similar functionality,suitable for system upgrades.
Pre-Installation Preparation
Before replacing the Modicon AEG CPU 8K 24VDC,disconnect the power supply!Old system capacitors may be charged;discharge them before operation.When removing the old module,check the base for bent pins.Before inserting the new module,check that the battery is installed correctly(if any),ensuring it’s not installed backwards.Take a photo of the terminal blocks to ensure they are properly connected.Before applying power,use a multimeter to check the power polarity.Be sure not to connect the 24VDC module incorrectly,as this can cause a sudden burnout.
Maintenance Recommendations
This Modicon AEG CPU 8K 24VDC is essentially maintenance-free,but it’s recommended to check the battery every two years.If the battery voltage drops below 2.8V,replace it;don’t wait for leakage.Back up your programs regularly to a USB drive or paper document.If the system is down for an extended period,it’s recommended to disconnect the power supply to prevent slow battery discharge and corrosion of the motherboard.Older equipment deserves even more meticulous care;a good CPU can save you ten years of worry.
Product Guarantee
At Shenzhen Changxin,we meticulously inspect every Modicon AEG CPU 8K 24VDC.Upon arrival,we disassemble the unit and inspect it for battery leakage,PCB corrosion,and component replacement.We then power on and test the power supply,communications,and I/O scanning to ensure full functionality.We offer a three-year warranty and full replacement for non-intentional damage.We’re not in the business of quick profits;we’re committed to being your lifelong supporter of industrial control spare parts.Trust us,we’ll stand by you!
The Modicon AEG CPU 8K 24VDC represents a cornerstone of industrial automation from a bygone era,yet remains critically important today.At Shenzhen Changxin,we specialize in preserving the operational life of legacy systems with rigorous testing,expert refurbishment,and long-term supply assurance.Each unit is inspected for battery damage,circuit integrity,and full functional performance before shipment.We offer a three-year warranty,technical documentation support,and global logistics to ensure minimal downtime.Our mission is clear:to keep your aging but vital infrastructure running—reliably,affordably,and without compromise.Partner with us,and you’re not just buying a spare part;you’re securing the continuity of your production.
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