Mitsubishi Electric MELSEC iQ-R Series Modules

Technical Dossier

Product Details And Specifications

Mitsubishi Electric MELSEC iQ-R Series: Comprehensive Module Range and Technical Overview

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.

Sourcing Hard-to-Find & Obsolete MELSEC iQ-R Parts

DriveKNMS maintains a dedicated inventory program for MELSEC iQ-R series modules, with particular focus on CPU variants and communication modules that have entered limited-availability or regional phase-out status. For plants operating on extended maintenance cycles — common in nuclear, refining, and chemical sectors where control system replacement projects span 5–15 years — sourcing certified spare CPU modules such as the R612CPU-B, R616CPU-B, or early-generation R04CPU units is operationally critical. DriveKNMS sources these modules through authorized distribution channels and verified secondary market suppliers, with full traceability documentation. Each unit is inspected against Mitsubishi Electric's published hardware revision records to confirm firmware compatibility with the customer's existing GX Works3 project files and system parameter configurations. Customers requiring cross-generation migration support (Q-series to iQ-R) can request compatibility assessment services alongside hardware procurement.

Quality Control for the MELSEC iQ-R Range

The MELSEC iQ-R series employs a proprietary high-speed backplane bus with differential signal transmission between modules. Quality verification for iQ-R modules at DriveKNMS follows a structured protocol: (1) Visual inspection of backplane connector pins and module housing for mechanical damage or corrosion; (2) Power-on functional test using a reference R61P power supply and verified base unit to confirm module recognition and LED status codes; (3) CPU modules are tested for program read/write integrity via GX Works3 connection, verifying USB and Ethernet communication ports independently; (4) I/O modules undergo point-by-point signal verification using calibrated test equipment to confirm input threshold voltages and output switching accuracy; (5) Communication modules are tested for network frame transmission and protocol handshake completion on isolated test networks. Modules that pass all stages are issued a DriveKNMS inspection certificate with test date, technician ID, and hardware serial number for customer traceability records.