Schneider AEG CPU21304

The MODICON QUANTUM CPU 21304 launched by Schneider Electric is a core processing unit tailored for small and medium-sized field control systems. It adopts an 80186-compatible microprocessor with a main frequency of approximately 20 MHz, equipped with 768 KB RAM (including MATH MB+), enabling high-speed logic operations and basic mathematical calculation functions. Featuring a modular design, this CPU can be flexibly assembled in standalone or distributed systems, making it suitable for various industrial scenarios such as process control, mechanical automation and building automation.

Key Technical Specifications

• Processor: 80186-compatible, 20 MHz clock frequency
• Memory: 768 KB RAM (including MATH MB+)
• Discrete I/O: Up to 64k points (any combination)
• Local I/O structure: 64 In / 64 Out, supporting 1 Rack local I/O expansion
• Remote I/O: 64 In / 64 Out per remote branch, up to 31 branches in total
• Network: 1 port each for Modbus (RS-232) and Modbus Plus (RS-485), supporting up to 3 networks
• Logic solving time: 0.3 ms/k to 1.4 ms/k (depending on program scale)
• Communication interfaces: 1 9-pin D-shell serial port, 1 9-pin D-shell network port
• Power supply: 24 V DC, power consumption approx. 780 mW (standalone)

Product Features

1. Modular structure: The CPU is separated from I/O and communication modules, facilitating on-site maintenance and later-stage expansion.
2. High reliability: Adopting industrial-grade components with a wide operating temperature range (-25 °C – +55 °C), it is ideal for harsh environments.
3. Rich I/O capacity: The standalone unit directly supports up to 64k discrete I/O points, which can be further expanded to thousands of points via remote branches.
4. Multi-protocol compatibility: Built-in Modbus and Modbus Plus enable seamless interconnection with upper-level systems or devices from other manufacturers.
5. Fast logic execution: The solving speed of 0.3 ms/k meets most real-time control requirements.
6. Easy programming: Compatible with Schneider Electric’s Unity Pro/SoMachine development environment, supporting multiple programming languages such as ladder diagram and structured text.