Description

Designed for high-precision motion control and positioning feedback within the MELSEC-Q automation platform, the QD65PD2 is a high-performance, dual-channel multifunction counter and timer module. This unit enables rapid and precise pulse counting, measurement, and control output operations. It supports input frequencies up to 8 Mpps using differential line drivers, making it highly effective for processing high-resolution rotary encoder signals and execution of real-time control loops.

The module incorporates a versatile feature set including preset/latch counting, pulse width measurement down to 100 ns resolution, cam switch emulation with up to 16 steps per output, and pulse-width modulation (PWM) capabilities. Housed in a compact single-slot Q-series footprint, the QD65PD2 integrates seamlessly with Q-series CPUs to offload critical high-speed counting tasks from the main processing cycle, ensuring predictable system performance in high-speed industrial environments.

Features

• Dual independent high-speed counter channels supporting differential and DC inputs.
• High-speed counting performance up to 8 Mpps (differential line driver) or 200 kpps (DC input).
• Flexible input phase configurations: 1-phase (1x/2x multiplication), 2-phase (1x/2x/4x multiplication), and CW/CCW.
• 32-bit signed binary counter range spanning -2,147,483,648 to 2,147,483,647.
• Integrated hardware-level latch, preset, and match detection functions.
• High-resolution pulse measurement capability with a 100 ns base resolution.
• Electronic cam switch functionality supporting up to 8 output points and 16 steps per point.
• PWM output configurable up to 200 kHz on high-speed outputs and 2 kHz on low-speed outputs.

Applications

• Rotary encoder and linear scale feedback processing in CNC machinery.
• High-speed packaging and sorting conveyor synchronization.
• Precision positioning systems in semiconductor and electronics assembly.
• Cut-to-length and flying shear control systems.
• Turbine speed and flow meter pulse train measurement.

Technical Specifications

Installation Guidelines

• Ensure all system power supplies are completely isolated before mounting or removing the module from the MELSEC-Q base unit.
• Use shielded, twisted-pair cabling for all high-speed differential and DC count inputs to minimize electromagnetic interference (EMI).
• Connect the cable shield ground to the cabinet's protective earth (PE) busbar at the controller side.
• Route signal cables separately from high-voltage AC or motor drive power lines (minimum separation of 100 mm is recommended).
• Utilize the compatible 40-pin connectors (A6CON1, A6CON2, or A6CON4) and verify secure physical latching to prevent intermittent connection failures.