Mitsubishi R02CPU Programmable Logic Controller

The Mitsubishi R02CPU is a universal CPU module for the MELSEC iQ-R series programmable logic controller platform. It features a program memory of 32 kB (steps), a basic instruction execution time of 0.98 ns, and a maximum I/O capacity of 4096 points. The CPU includes built-in Ethernet (100BASE-TX/10BASE-T) and USB ports for programming and communication. It supports multi-CPU configurations (up to 4 CPUs) and is suitable for small to medium-sized automation systems. The R02CPU is a cost-effective entry point into the iQ-R series, offering high performance in a compact form factor.

Technical Specifications

Program memory: 32 kB (steps). Device memory: 1.5 MB. Basic instruction speed (LD): 0.98 ns. Application instruction speed (MOV): 1.92 ns. I/O points: 4096 max. Number of I/O modules: 32 max (in main base). Built-in Ethernet: 1 port (100BASE-TX/10BASE-T), supports MELSOFT, SLMP, Modbus TCP, socket communication. Built-in USB: for programming. Multi-CPU support: up to 4 CPUs. Power consumption: 5V DC, 0.35 A. Dimensions: 110 mm (H) × 27.8 mm (W) × 105 mm (D). Weight: 0.2 kg. Operating temperature: 0°C to 55°C. Storage: -25°C to 75°C. Humidity: 10-90% non-condensing. Certifications: CE, UL, RoHS.

Key Features

• 32 kB program memory for small to mid-size applications

• Ultra-fast processing: 0.98 ns per basic instruction

• Built-in Ethernet port for network connectivity

• Built-in USB port for convenient programming

• Multi-CPU system capable (up to 4 CPUs)

• Supports SD card for program and data logging

• Real-time clock with battery backup

• Compatible with GX Works3 software

Programming and Software

The R02CPU is programmed using Mitsubishi GX Works3 (IEC 61131-3 languages: LD, ST, FBD, SFC). It supports function blocks, structured data types, and online editing. The built-in Ethernet port allows remote access and connection to HMIs. The CPU also features a built-in web server for diagnostics.

Applications

The R02CPU is suitable for small-scale control systems such as packaging machines, assembly fixtures, and conveyors. It can also be used as a sub-CPU in larger multi-CPU configurations.

Installation

Mount the CPU in any slot of an iQ-R series base unit (R3xxB). Connect 24V DC power to the base unit (the CPU draws power from the backplane). Insert an SD card if needed. Set the CPU number using DIP switches for multi-CPU configurations. Connect Ethernet and USB cables as required.

Maintenance and Diagnostics

LEDs: RUN, ERR, USER, BAT, I/O. Use GX Works3 to read diagnostic buffer. The battery (type Q6BAT) retains real-time clock and retentive data; replace every 5 years.

Conclusion

The Mitsubishi R02CPU offers a compact, high-performance entry into the iQ-R series. With its built-in Ethernet, fast processing, and low cost, it is an ideal choice for small yet powerful PLC applications.