MODICON ALU154-1 PLC Central Unit

Technical Specifications

Model: ALU154-1 Brand: MODICON(Schneider) Product Type: Rack Mount PLC Central Processing Unit Power Supply: 110/220VAC Program Memory: 8K words Communication: RS485 Modbus serial interface Mounting: Backplane rack slot mount Operating temperature: 0℃ ~ +60℃ Storage temperature: -20℃ ~ +70℃ Relative humidity: 5%~95%, non-condensing Weight: 1.2kg Dimension: 260mm140mm30mm Protection: IP20

System compatibility

ALU154-1 belongs to MODICON legacy PLC series CPU. Compatible with corresponding rack backplane and series I/O modules. It serves as main processor for discrete and analog control systems. Suitable for renovation and replacement of old automation systems in chemical plants, water treatment, power plants and packaging machinery.

Function

ALU154-1 PLC central processing unit. It executes ladder logic programs, scans digital and analog I/O modules on backplane, performs timer, counter, arithmetic and PID calculation. RS485 Modbus port supports connection with HMI and other field devices. Lithium backup battery retains user program and runtime data after power failure. Built-in hardware watchdog and self-diagnosis function, with run/fault/battery low LED indicators. Widely used for process and machine control in legacy MODICON automation system.

Installation

Cut off rack power before installation. Insert ALU154-1 CPU module into MODICON backplane slot and lock the card. Check gold finger contact condition. Connect AC power wiring and Modbus communication cable. Download PLC program, verify I/O scanning and communication function before formal operation.

Interface

Backplane bus connector, AC power terminal block, RS485 Modbus port, run/fault/battery low status LED indicators for ALU154-1 MODICON PLC CPU.

Feature

MODICON ALU154-1 rack CPU, 8K program memory, 110/220VAC power, RS485 Modbus communication, battery backup memory, hardware watchdog, self-diagnosis, industrial anti-interference design. This discontinued legacy industrial spare part used for old MODICON PLC rack main control maintenance and replacement.

Diagnostic

CPU no power: check AC input supply, fuse and wiring for ALU154-1. Fault LED on: inspect program error, memory corruption or low backup battery. Modbus communication failure: verify cable, baud rate, parity and shielding grounding. I/O modules not detected: check backplane power and module seating. Intermittent runtime fault: check loose connectors and component aging.

Product Brief

ALU154-1 is MODICON legacy rack mount PLC central unit. It runs ladder logic program, scans I/O modules and handles Modbus serial communication for industrial automation racks, classic spare part for legacy MODICON control system overhaul.

Disclaimer: All parameters are for reference only and shall not be used as the basis for quotation. Goods are scarce, overseas delivery lead time is 3-7 working days. It is only used for equipment maintenance and renovation.