MODICON ALU821 CPU Module

Technical SpecificationsModel:ALU821 Brand:MODICON Product Type:High Performance 32-bit PLC CPU Processor Module Power Supply:5V DC supplied by backplane Memory:256KB Flash,128KB SRAM,64KB EEPROM Mounting:Backplane rack slot mount Operating temperature:0℃ ~ +45℃ Storage temperature:-20℃ ~ +70℃ Relative humidity:5%~95%, non-condensing Weight:2.45kg Dimension:275mm145mm32mm Protection:IP20

System compatibilityALU821 belongs to MODICON high performance CPU series. Compatible with matching backplane, digital I/O, analog I/O and remote RIO modules. It supports Modbus and Ethernet communication, can connect with HMI, remote I/O stations and upper monitoring system. Suitable for chemical, metallurgy, energy and complex process control system renovation and replacement as industrial spare part.

FunctionALU821 is 32-bit high-speed PLC processor module with floating-point arithmetic function. It executes user logic program, handles complex mathematical operation, processes discrete and analog signals, outputs control commands to field actuators. It supports program storage, power-off data retention, hardware watchdog timer, fault self-diagnosis and multi-node network data exchange. Widely used for complex continuous industrial process control, serving as reliable core control spare part.

InstallationCut off rack power before installation. Insert the ALU821 CPU module into designated backplane slot and lock the module. Check backplane bus contact condition. Connect network communication cables, download control program and complete online communication test before formal operation.

InterfaceBackplane bus connector, Modbus communication port, Ethernet port, status LED indicators for ALU821 MODICON CPU module.

FeatureMODICON ALU821 rack type 32-bit CPU processor,floating-point calculation support,large memory capacity,hardware watchdog protection,multi communication interface,strong data processing capability,IP20 cabinet protection. This discontinued legacy industrial spare part used for old MODICON automation system maintenance and replacement.

DiagnosticModule no recognition: check rack power supply, backplane slot contact and module insertion for ALU821. CPU run fault: check program error, backup battery status and memory fault. Network communication loss: inspect network cable, terminal resistor and node address configuration. I/O data abnormal: verify backplane bus contact and field I/O module wiring. Fault alarm: read diagnostic codes through supporting programming software.

Product BriefALU821 is MODICON high performance 32-bit rack PLC CPU module. Equipped with floating-point operation function and multi communication ports, it is suitable for complex industrial process control, classic spare part for legacy industrial control equipment 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.