Product Details:

MODICON CPU21304, full part number 140CPU21304, is a high-performance rack mount CPU processor belonging to the Modicon Quantum automation platform. It integrates a dedicated math coprocessor and 768 KB user memory, supporting 984 ladder logic for complex process control, arithmetic calculation and closed-loop regulation. This processor carries two communication interfaces, one RS232 Modbus serial port for programming terminal and local HMI connection, and one Modbus Plus network port for distributed control networking. It supports up to 31 remote I/O drops and local Quantum backplane I/O expansion, suitable for building large distributed automation architectures. It adopts standard Quantum rack mounting, the front panel is equipped with LED indicators, mode key switch and communication configuration slide switch for convenient on-site operation and fault diagnosis. A lithium backup battery is fitted to retain user program and register data after power failure, and it supports password program protection. Industrial-grade circuit design with built-in EMC filtering and surge suppression ensures stable operation under strong electromagnetic interference in heavy industrial environments. As an obsolete original spare part, it is used for maintenance and retrofit of legacy Modicon Quantum control systems. Direct drop-in replacement keeps the existing control program, remote I/O layout and network configuration unchanged, avoiding large-scale system reconstruction and cutting production downtime.

Basic Parameters

Product type: Modicon Quantum PLC CPU processor

Full part number: 140CPU21304

User memory: 768 KB

Communication: RS232 Modbus, Modbus Plus

Logic execution speed: 0.3 µs per boolean

Max remote drops: 31

Programming software: Concept

Installation: rack mount for Modicon Quantum dedicated backplane

Operating temperature: 0°C ~ +60°C

Protection grade: IP20

Supported Functions

984 ladder logic scanning and execution

Local and remote I/O data acquisition and output

Modbus and Modbus Plus bidirectional communication

High-speed mathematical operation via math coprocessor

Program upload, download and online monitoring

Battery-backed program and register data retention

Core Functions

Real-time logic solving and sequence control

Onboard multi-status LED for run, comm and fault indication

Communication port transient surge suppression

Password protection for user control program

Data frame verification and error retransmission

Diagnostic flag storage for processor and network faults

Hardware Specifications & Environmental Features

Built-in noise filtering and surge suppression circuit

Storage temperature: -25°C ~ +70°C

Relative humidity: 5% to 95% non-condensing

Status: Obsolete original part, available for spare replacement

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

Note:Confirm Quantum backplane compatibility, backup battery condition and Modbus Plus node address before ordering.

This is from our current stock.

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