Mitsubishi Electric Q173HCPU MELSEC Q Series Motion Controller

Description

Optimizing synchronization across multiple axes in complex machinery, the Mitsubishi Electric Q173HCPU coordinates up to 32 independent servo axes within a single system. This high-density motion CPU module integrates directly onto the standard MELSEC Q Series multi-CPU backplane, sharing high-speed data transmission buses with host PLC modules to minimize processing overhead. Utilizing the noise-resistant, high-speed fiber-optic SSCNET III network, it provides reliable closed-loop control over servo drives and motors, preventing communication latency even in high-electromagnetic-noise environments. Designed to slot in directly to the right of the primary PLC CPU, the controller utilizes a clear base cover for status visualization and is structurally built to withstand heavy vibrational environments when panel-mounted.

Features

• 32-Axis Control Capability: Manages up to 32 physical axes of servo amplifiers via high-speed optical fiber linkages.
• Multi-CPU Architecture Support: Configurable alongside up to three additional Q Series CPUs for decentralized load distribution between control logic and motion trajectories.
• SSCNET III Integration: Dual high-speed optical ports provide reliable, noise-immune communications over fiber-optic cabling.
• Vibration-Resistant Design: Accommodates panel installation with unit-fixing screws to ensure connection integrity in high-vibration applications.
• Clear Cover Interface: Transparent protective housing permits immediate inspection of diagnostic status indicators and interface ports.

Applications

• High-speed pick-and-place electronic assembly systems.
• Synchronized web-handling, packaging, and printing systems.
• Multi-axis gantry robots and industrial Cartesian systems.
• Complex automated sorting and bottling lines requiring precise timing.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

When replacing an older Q173CPUN module, be aware that the Q173HCPU transitions from the copper-based SSCNET to the fiber-optic SSCNET III system. You must upgrade all associated cabling to optical fiber (MR-J3BUS or compatible) and ensure that the connected servo drives (e.g., MR-J3-B or MR-J4-B series in J3-compatibility mode) are fully compatible with SSCNET III protocols. Furthermore, check the Operating System software (SV13/SV22) programmed within the module; mismatching OS versions with the host GX Works2 / MT Developer2 configurations will trigger a CPU verification fault upon system boot.

Application Pitfalls & Engineering Notes

A common issue during multi-CPU configuration is allocating empty slots. The Q173HCPU cannot be separated from the host PLC CPU (CPU No.1) by an empty slot on the base unit. In addition, dust or microscopic scratches on the optical fiber connectors (CN1/CN2) are the primary causes of transient communication drops (alarm code AL.37). Always ensure the protective rubber caps remain fitted to unused optical ports and clean fiber ends with designated optical cleaning swabs prior to insertion.

Commissioning & Wiring Tips

When routing the fiber-optic cables, enforce a minimum bending radius of 25 mm. Exceeding this limit causes signal attenuation, leading to intermittent link losses. During software commissioning in MT Developer2, ensure that the multi-CPU shared memory configurations align exactly between the PLC program and the Motion SFC code to prevent parameter overlap errors.

Installation Guidelines