The Q62DA is Mitsubishi Electric’s 2-channel digital-to-analogue output module for the MELSEC-Q programmable controller series, converting 12-bit digital values from the CPU program into analogue voltage or current signals for controlling variable-speed drives, proportional control valves, positioners, and other field devices requiring an analogue setpoint input. With two independently configurable output channels supporting both voltage (0–10 VDC, -10 to +10 VDC) and current (4–20 mA, 0–20 mA) output ranges, the Q62DA provides flexible analogue output capability for applications where a small channel count is sufficient and per-channel cost must be minimised. Atlantech Drives holds stock of the Q62DA. Contact us for fast worldwide delivery and competitive pricing.
What Is the Q62DA?
The Q62DA is a MELSEC-Q series analogue output module providing two channels of 12-bit resolution digital-to-analogue conversion. Each channel independently generates a user-selectable analogue output signal — voltage or current — based on the digital value written to the module’s buffer memory by the CPU program. The output range for each channel is configured independently using GX Works2’s intelligent function module parameter settings, with options for unipolar voltage (0–5 VDC, 0–10 VDC, 1–5 VDC), bipolar voltage (-10 to +10 VDC), and current (0–20 mA, 4–20 mA) outputs. The Q62DA communicates with the CPU via the MELSEC-Q high-speed internal bus using the FROM/TO instruction pair or GX Works2’s auto-refresh function, with output values updated every scan cycle. The module provides optical isolation between the analogue output circuit and the 5 VDC internal bus, protecting field devices from internal bus noise and ground loop interference.
Key Technical Specifications
- Model: Q62DA
- Output Channels: 2
- Resolution: 12-bit (4,000 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 (all channels updated simultaneously)
- 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 for analogue output circuit)
- Operating Temperature: 0°C to 55°C
- Weight: Approx. 0.20 kg
Compatibility & System Integration
The Q62DA is compatible with all MELSEC-Q CPU modules and base units and integrates with the full range of MELSEC-Q communication and motion modules. In GX Works2, the Q62DA is configured as an intelligent function module — output range, scaling, and channel enable/disable settings are stored in the module’s parameter area and loaded automatically at CPU startup. The module supports GX Works2’s auto-refresh function, which automatically transfers D register values to the Q62DA’s buffer memory each scan cycle without explicit FROM/TO instructions in the ladder program, simplifying the program structure for analogue output control. For applications requiring synchronised multi-channel analogue output updates (such as coordinated XY positioning with two independent analogue-commanded axes), the Q62DA’s simultaneous update function writes both channels’ output values atomically at the same scan cycle transition, preventing the brief output mismatch that would occur if channels were updated sequentially. The Q62DA’s 4–20 mA current output mode is particularly well suited for long-distance analogue signal transmission to remote field devices (valve positioners, VFD speed references) where voltage outputs would be susceptible to line resistance voltage drop over cable runs exceeding 10 metres.
Replacement & Upgrade Notes
The Q62DA is the MELSEC-Q replacement for the legacy MELSEC-A series DA62 and MELSEC-AnS series A1S62DA analogue output modules. When migrating from an A1S62DA to a Q62DA in a retrofit project, note that the buffer memory address map differs between the two modules — the ladder program’s FROM/TO instructions referencing the A1S62DA buffer addresses must be updated to the Q62DA address map, which is documented in the MELSEC-Q Q62DA user manual’s buffer memory section. Output range configuration also changes from DIP switch settings (A1S62DA) to GX Works2 software parameters (Q62DA), simplifying future range changes without hardware modification. For applications currently using the Q62DA and requiring more than two analogue output channels, the Q64DA (4-channel) and Q68DAVN (8-channel) modules are the direct capacity upgrades within the MELSEC-Q analogue output range, sharing the same buffer memory structure and GX Works2 configuration approach for straightforward channel count expansion.
Frequently Asked Questions
Q: Does the Q62DA require an external 24 VDC power supply, and what happens if it is not connected?
A: Yes. The Q62DA requires an external 24 VDC supply (0.25 A) connected to its power terminals to operate the analogue output circuit. If the 24 VDC supply is not connected, the analogue outputs will not generate any signal regardless of the digital values written to the buffer memory, and the CPU will report a module error for the Q62DA slot. The 24 VDC supply must be connected and powered before the CPU initialises the module at startup.
Q: What is the difference in output accuracy between the Q62DA’s 12-bit resolution and the Q64DA’s 16-bit resolution?
A: The Q62DA’s 12-bit resolution provides 4,096 output levels (4,000 usable divisions) over the selected range — for a 0–10 VDC output, this means a minimum step size of 2.5 mV. The Q64DA’s 16-bit resolution provides 65,536 levels (16,000 usable divisions), giving a minimum step of 0.625 mV for the same range. For most industrial control applications including VFD speed reference and valve positioning, 12-bit resolution is fully adequate. 16-bit resolution is justified for precision laboratory instrumentation, high-accuracy force control, and applications where setpoint resolution below 0.1% of full scale is required.
Q: Can the Q62DA output a 4–20 mA signal to a HART-enabled field device?
A: The Q62DA generates a standard 4–20 mA analogue output but does not support HART (Highway Addressable Remote Transducer) digital communication superimposed on the analogue signal. For HART-enabled field devices where HART communication is required for device configuration or diagnostics, a HART modem or HART multiplexer must be connected to the Q62DA’s current output loop externally. The Q62DA’s 4–20 mA output is compatible with the analogue portion of HART devices and will correctly position the device based on the mA setpoint.
Do you need more references from this brand? Explore our full catalog of Mitsubishi here: https://atlantechdrives.com/manufacturers/mitsubishi/
