Mitsubishi Electric QD70D8 MELSEC-Q Series Multi-Axis Positioning Module

Description

Designed for high-performance motion applications within the MELSEC-Q Series platform, the QD70D8 provides precise, multi-axis control capabilities directly from the programmable controller backplane. This high-density positioning module supports up to 8 independent axes, enabling point-to-point (PTP) trajectory control and speed-to-position switching without requiring extensive external coprocessing. Utilizing a differential driver output, it ensures high noise immunity and stable pulse train transmission over distances up to 10 meters.

The module integrates seamlessly with standard servo drives and stepper motor amplifiers. With a rapid startup response, it is engineered for operations requiring synchronous or highly responsive multi-axis coordinate movements. By executing position control directly through pulse commands, this module simplifies complex wiring and reduces load on the main CPU.

Features

• Independent 8-axis point-to-point (PTP) and speed/position switching control.
• High-speed pulse train output up to 4,000,000 pulses per second via differential driver outputs.
• Rapid start times with 0.1 ms for a single-axis start and 0.4 ms for simultaneous 8-axis initialization.
• Flexible acceleration and deceleration profiles supporting both trapezoidal and S-curve configurations.
• High-density physical interface featuring four 40-pin external connectors.
• Robust noise immunity designed for electrically harsh industrial environments.

Applications

• Multi-axis pick-and-place packaging systems.
• Semiconductor and electronics assembly lines.
• High-speed automated sorting and material handling systems.
• Textile and converting machinery requiring synchronized multi-axis feeds.

Technical Specifications

Connections and Interfaces

The module is equipped with four 40-pin high-density connectors on the front panel to interface with external drive units and limit switches. The connection scheme requires dedicated connector plugs (sold separately):

Installation Guidelines

• Mounting: Ensure the power to the base unit is fully turned off before inserting or removing the positioning module from the Q-series backplane.
• Wiring: Use shielded twisted-pair cabling for all differential pulse command lines to prevent electromagnetic interference. Keep pulse signal lines separated from primary AC power and high-voltage motor lines by at least 100 mm.
• Grounding: Always connect the shield of the pulse output cables to the ground terminal on the drive side or the control panel's system ground bar.
• Cooling: Ensure the ventilation slots on the top and bottom of the module are free from obstruction to maintain appropriate operating temperatures within the enclosure.