Mitsubishi Electric R612CPU-B

Technical Dossier

Product Details And Specifications

Mitsubishi Electric MELSEC iQ-R Series Technical Notes

The Mitsubishi Electric MELSEC iQ-R series is a high-performance programmable logic controller (PLC) platform deployed across global heavy industry sectors including petrochemical refining, nuclear power generation, automotive manufacturing, and continuous-process chemical plants. Introduced as the successor to the MELSEC Q series, the iQ-R platform is engineered around a high-speed system bus (iQ-R bus) capable of 150 Mbps inter-module communication, enabling deterministic real-time control at sub-millisecond cycle times. Its modular backplane architecture supports mixed installation of CPU, I/O, motion, safety, and communication modules on a single base unit, reducing panel footprint and wiring complexity in large-scale distributed control systems (DCS) and SCADA environments. The R612CPU-B is a representative high-end CPU module within this series, supporting up to 260K steps of program memory, multiple network interfaces, and redundant operation capability — making it a standard specification in mission-critical continuous-process installations.

The Evolution of MELSEC iQ-R Architecture

Mitsubishi Electric's PLC architecture has progressed through four distinct generations relevant to current industrial installed bases. The MELSEC A series (1970s–1990s) established the foundational ladder logic programming model. The MELSEC Q series (QnUDE, QnUDEH, QnUDVCPU variants, introduced 1999–2010) introduced multi-CPU synchronization and high-speed bus communication at 25 Mbps, and remains widely installed in legacy plants. The MELSEC iQ-R series (launched 2014) replaced the Q series with a 6x faster system bus, unified engineering environment (GX Works3), and native support for CC-Link IE Field Network Basic and CC-Link IE TSN. The iQ-R platform introduced a new backplane pinout and module form factor, meaning Q-series modules are not physically or electrically compatible with iQ-R bases without dedicated conversion adapters (e.g., QnUDVCPU migration kits). As of 2024, the iQ-R series is in its mature phase with active production; however, early-generation R-series CPU variants (R04CPU, R08CPU) are approaching reduced-support status in some regions, increasing demand for certified spare units. The R612CPU-B specifically targets high-end redundant system configurations and remains in active production.

MELSEC iQ-R Full Catalog & Functionalities (SKU List)

CPU Modules

• R04CPU: Standard CPU, 40K steps, 4 network interfaces, entry-level iQ-R controller.
• R08CPU: Mid-range CPU, 80K steps, supports up to 4 multi-CPU configurations.
• R16CPU: 160K steps program memory, enhanced instruction processing for complex sequences.
• R32CPU: 320K steps, high-capacity CPU for large-scale process control applications.
• R120CPU: 1200K steps, top-tier standard CPU for enterprise-scale PLC programs.
• R612CPU-B: High-end redundant-capable CPU, 260K steps, dual-port Ethernet, built-in CC-Link IE Controller Network interface.
• R616CPU-B: Extended redundant CPU, 600K steps, designed for continuous-process redundant system architectures.
• R620CPU-B: Maximum-capacity redundant CPU, 1200K steps, dual-system hot-standby operation.

Digital I/O Modules

• RX10: 16-point DC input module, 24 VDC sink/source, standard digital input for field device interfacing.
• RX28: 32-point DC input module, high-density digital input, 0.1 ms response time.
• RY10R2: 16-point relay output module, 2A per point, for high-current actuator switching.
• RY40PT5B: 32-point transistor output module, 0.5A per point, source type, high-speed output.

Analog I/O Modules

• R60AD4: 4-channel analog input module, 16-bit resolution, ±10V / 4–20mA selectable per channel.
• R60DA4: 4-channel analog output module, 16-bit resolution, voltage/current dual-mode output.
• R60ADI8-G: 8-channel isolated analog input, high-accuracy measurement for process instrumentation.

Communication & Network Modules

• RJ71GF11-T2: CC-Link IE Field Network master/local module, 1 Gbps, for distributed I/O field networks.
• RJ71EN71: Ethernet interface module, dual-port, supports SLMP and MELSOFT communication protocols.
• RJ71C24-R4: Serial communication module, RS-232/RS-422/RS-485, for legacy device integration.

Power Supply Modules

• R61P: 100–240 VAC input power supply module, 6A DC output, standard base unit power source.
• R62P: 100–240 VAC input, 6A, with enhanced noise immunity for harsh electrical environments.