The Q62DAN is Mitsubishi Electric’s high-resolution 2-channel digital-to-analogue output module for the MELSEC-Q programmable controller series, providing 16-bit resolution conversion of CPU program values into precision analogue voltage or current output signals — delivering four times the output resolution of the standard Q62DA for applications requiring sub-0.1% setpoint accuracy in precision process control, laboratory instrumentation, and high-performance motion guidance systems. With the same 2-channel architecture and flexible voltage/current output range selection as the Q62DA but with 16-bit rather than 12-bit conversion, the Q62DAN is the direct high-precision upgrade for applications where the Q62DA’s 12-bit resolution proves insufficient. Available now at Atlantech Drives with worldwide express delivery and 12-month warranty — complete our quote form for pricing and availability.
What Is the Q62DAN?
The Q62DAN is a MELSEC-Q series precision analogue output module providing two channels of 16-bit digital-to-analogue conversion. Like the Q62DA, each channel independently generates a user-selectable analogue output in voltage or current mode based on digital values written to the module’s buffer memory by the CPU. The 16-bit resolution provides 65,536 output levels (16,000 usable divisions) over the selected range — compared to the Q62DA’s 4,000 divisions — enabling setpoint resolution as fine as 0.625 mV on a 0–10 VDC output range or 1.25 µA on a 4–20 mA range. The Q62DAN uses the same GX Works2 configuration interface, buffer memory structure, and FROM/TO or auto-refresh programming approach as the Q62DA, enabling straightforward replacement or upgrade between the two modules without significant program modifications beyond the module type selection in GX Works2’s intelligent function module parameters.
Key Technical Specifications
- Model: Q62DAN
- Output Channels: 2
- Resolution: 16-bit (16,000 usable divisions over the selected output range)
- Output Range (Voltage): 0–5 VDC, 1–5 VDC, 0–10 VDC, -10 to +10 VDC
- Output Range (Current): 0–20 mA, 4–20 mA
- Maximum Output Current (Voltage Mode): 10 mA per channel
- Load Resistance (Current Mode): 600 Ω maximum
- Accuracy: ±0.1% of full scale at 25°C (±0.3% over full temperature range)
- Output Response Time: 1 ms per channel
- Isolation: Optical, between internal bus and each analogue output channel
- Current Consumption (5 VDC internal bus): 0.35 A
- External Power Supply: 24 VDC ±10%, 0.25 A (required)
- Operating Temperature: 0°C to 55°C
- Weight: Approx. 0.20 kg
Typical Industrial Applications
The Q62DAN is specified in applications where analogue output resolution is a critical performance parameter rather than a secondary consideration. Precision servo valve controllers in hydraulic press and injection moulding applications require sub-0.1% positioning resolution — a 16-bit setpoint provides 16,000 position steps across the valve’s full stroke, compared to only 4,000 steps with a 12-bit module, enabling significantly smoother position control with less quantisation-induced dither in the valve spool. In analytical laboratory automation systems, the Q62DAN drives high-accuracy syringe pump controllers and precision reagent dispensing positioners where dispensed volumes must be accurate to better than 0.5% of set volume. Precision tension control systems for winding applications in film, foil, and fibre production use the Q62DAN to generate analogue torque references for AC servo drives, where tension uniformity directly affects product quality — the 16-bit resolution eliminates the visible banding that can occur in thin film products when 12-bit analogue setpoints produce step changes in the tension reference. Calibration and metrology equipment used for instrument calibration also commonly specifies the Q62DAN as the reference signal source, where traceable output accuracy and high resolution are mandatory requirements.
Troubleshooting Guide
If the Q62DAN’s analogue output is not responding to changes in the CPU program’s setpoint values, the first diagnostic step is to verify that the module’s 24 VDC external power supply is connected and within the 21.6–26.4 VDC operating range — the analogue output circuit is entirely powered by the external 24 VDC supply, and loss of this supply causes all outputs to go to 0 V or 0 mA regardless of the buffer memory contents. Check the external supply voltage at the Q62DAN’s power terminals with a multimeter, not at the power supply output terminals, as voltage drop in the supply cable can bring the module terminal voltage below the minimum threshold even if the supply output is nominally correct. If the external supply is confirmed correct and the output is still not responding, use GX Works2’s buffer memory monitor to verify that the correct digital value is being written to the Q62DAN’s D/A conversion enable register (buffer memory address 0) and the output enable register (buffer memory address 1) — a common programming error is failing to set the conversion enable flag after changing output range parameters, which leaves the module in hold state with the output frozen at its last valid value. For outputs that show correct values in buffer memory but incorrect analogue levels at the output terminals, suspect the external load impedance — verify that the connected load resistance does not exceed the 600 Ω maximum for current mode or that no short circuit exists on voltage mode outputs.
Frequently Asked Questions
Q: What is the practical difference between the Q62DA (12-bit) and Q62DAN (16-bit) for a VFD speed reference application?
A: For a typical 0–50 Hz VFD speed reference on a 0–10 VDC input, the Q62DA provides 4,000 speed steps (12.5 mHz per step, or 0.025% of full speed), while the Q62DAN provides 16,000 steps (3.125 mHz per step, 0.00625% of full speed). For most conveyor and pump speed control applications, the Q62DA’s resolution is fully adequate — speed steps of 0.025% are imperceptible. The Q62DAN is justified for precision speed synchronisation applications (such as multi-roll coating line draw ratio control) where speed matching accuracy below 0.01% is required to maintain consistent product thickness.
Q: Can the Q62DAN be used as a direct replacement for the Q62DA without program changes?
A: Mostly yes. The Q62DAN uses the same buffer memory structure and GX Works2 configuration approach as the Q62DA. The FROM/TO instructions or auto-refresh settings referencing the Q62DA will work with the Q62DAN with only the module type changed in GX Works2’s intelligent function module parameters. However, the output digital value range changes — the Q62DA uses a 0–4000 scale (12-bit) while the Q62DAN uses a 0–16000 scale (16-bit) for the same output range. Any setpoint values hardcoded as constants in the ladder program must be scaled up by a factor of four when swapping from Q62DA to Q62DAN to maintain the same analogue output level.
Q: Does the Q62DAN support offset and gain calibration for factory-calibrated precision applications?
A: Yes. The Q62DAN includes user-accessible offset and gain adjustment registers in its buffer memory, allowing the module’s output calibration to be trimmed to compensate for connected load impedance variations or to match the input calibration of a specific field device. The offset adjustment shifts the zero-point of the output, and the gain adjustment scales the full-scale output. Calibration values are stored in the module’s non-volatile memory and retained across power cycles. Mitsubishi recommends performing the offset and gain calibration procedure described in the Q62DAN user manual after initial installation and after any replacement of the field device connected to the module.
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