Product Details

Modicon ALU154-1 is a robust a250 plc cpu controller and reliable modnet 1 processor belonging to the AEG Modicon A250 modular controller family. This legacy programmable cpu serves as the central processing unit for the A250 rack system, equipped with native Modnet 1 / SFB network interface for peer-to-peer communication across legacy plant control networks. It executes dedicated AEG control logic, supports large program memory capacity and battery-backed RAM to preserve data during power interruption. The module plugs directly into the A250 backplane and communicates with matched discrete, analog and specialty I/O modules over the rack bus. It carries an RS232 serial port for programming, parameter upload and download, and supports connection to operator terminals and supervisory hosts. Built with industrial-grade components and conformal coated PCB, it is designed for continuous long-run operation under vibration, dust and fluctuating power conditions common in process plants. As a discontinued legacy spare, this a250 plc cpu controller acts as a drop-in replacement to restore core logic and Modnet network communication for ageing Modicon A250 automation racks.

Basic Parameters

Brand: Modicon (AEG / Schneider legacy)

Model: ALU154-1

Product Type: A250 Series Modnet 1 PLC CPU Processor

Compatible Rack: Modicon A250 modular backplane and chassis

Programming Interface: RS232 serial port

Network: Built-in Modnet 1 / SFB communication interface

Memory: Battery-backed RAM, large user program storage

Mounting: Single-slot rack insertion

Indicator: Front LED for run, fault, network activity and diagnostic status

Power: Powered via A250 backplane bus

Product Status: Discontinued, end of original production

Net Weight: Approximately 0.52 kg

Supported Functions

This a250 plc cpu controller performs cyclic scanning of user control logic and all connected A250 I/O modules. The modnet 1 processor handles timer, counter, arithmetic, comparison and PID closed-loop regulation for temperature, flow, pressure and level control. This legacy programmable cpu can operate as master or slave on the Modnet 1 network, exchanging real-time process tags with other A250 controllers and remote field stations. It supports sequential batch control, alarm management and recipe storage. It runs comprehensive built-in self-diagnostics to detect memory corruption, network failure, backplane bus error and low backup battery voltage. When critical faults are triggered, it drives outputs to predefined safe states to protect field actuators and process equipment. It works cooperatively with the full lineup of A250 series I/O and communication modules.

Core Functions

As the central modnet 1 processor, this a250 plc cpu controller interprets user control programs, acquires field I/O signals and issues output commands to actuators. Its native Modnet 1 interface enables distributed interlocking and cross-station data sharing among legacy AEG Modicon control hardware. This legacy programmable cpu works as a direct spare to rebuild the main control brain for ageing Modicon A250 automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Rugged metal framed single-slot module

Protection: Hardware watchdog, transient suppression, battery backup circuit

Anti-interference: Isolated network and serial ports, ground plane PCB for EMI reduction

Compatibility: Modicon A250 chassis, A250 I/O modules, Modnet 1 network stations

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm program backup, backup battery health, Modnet 1 network termination and A250 backplane compatibility before ordering.

This is from our current stock.

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