Mitsubishi QX40 MELSEC-Q Series 16-Point DC Input Module 24V Sink Type

Mitsubishi Electric MELSEC‑Q series digital input module with 16 sink‑type (positive common) channels rated at 24 V DC. Photocoupler isolation between field terminals and the internal system bus protects the CPU from voltage spikes and ground loops. Configurable input response time (1, 5, 10, 20, 70 ms) via PLC parameters enables adaptation to different sensor types and noise environments. 18‑point screw terminal block, 16 individual status LEDs for visual diagnostics, compact 27.4 mm width. For MELSEC‑Q series main base units and extension base units.

Applications:

• Digital signal acquisition from limit switches, proximity sensors, pushbuttons and selector switches

• High‑density input expansion for Q series PLC systems

• Conveyor systems, material handling and packaging machinery

• Factory automation and process control input panels

• Machine control panels in general industrial automation

Technical Specifications:

Core Specifications

• Number of inputs: 16 (sink type, positive common)

• Rated input voltage: 24 V DC (+20% / –15%, ripple ratio ≤ 5%)

• Rated input current: Approx. 4 mA at 24 V DC

• Input impedance: Approx. 5.6 kΩ

• ON voltage / ON current: ≥ 19 V DC / ≥ 3 mA

• OFF voltage / OFF current: ≤ 11 V DC / ≤ 1.7 mA

• Response time: Configurable 1, 5, 10, 20, 70 ms (CPU parameter setting, default 10 ms)

• Isolation method: Photocoupler

• Dielectric withstand voltage: 560 V AC rms for 3 cycles

• Insulation resistance: ≥ 10 MΩ (insulation resistance tester)

• Noise immunity: 500 Vp‑p noise voltage, 1 μs noise width, 25‑60 Hz noise frequency; IEC 61000‑4‑4: 1 kV

• Protection rating: IP2X

Power Consumption & Physical Specifications

• Internal current consumption (5 V DC): 50 mA (TYP., all points ON)

• Occupied I/O points: 16 (I/O assignment: Input 16 points)

• Common terminal arrangement: 16 points / 1 common (common terminal: TB17)

• External connection: 18‑point screw terminal block (M3 × 6 screws)

• Applicable wire size: 0.3 – 0.75 mm² (22–18 AWG)

• Applicable crimping terminal: R1.25‑3 (sleeved crimping terminals cannot be used)

• Operation indicator: LED per input point

• Dimensions (H × W × D): 98 mm × 27.4 mm × 90 mm

• Weight: approx. 0.16 kg

• Operating temperature: 0 °C … 55 °C

• Storage temperature: –20 °C … 75 °C

System Integration:

• This input module belongs to the Mitsubishi Electric MELSEC‑Q series.

• Installs into any MELSEC‑Q series main base unit (Q3□B, Q5□B, Q6□B series) or extension base unit slot via the Q series backplane bus.

• Compatible with Q series CPU modules (Q00J, Q00, Q01, Qn, QnH, QnPH, QnPRH, QnU series).

• Input response time is set via I/O assignment parameters in GX Works2 or GX Developer.

• For wiring: As a sink‑type module, connect 24 V DC (+) to the COM terminal (TB17); inputs are triggered when the terminal is connected to DC common (–).

• 16 individual status LEDs provide immediate visual feedback for troubleshooting and commissioning.

Standards & Compliance:
Refer to manufacturer official documentation for detailed certification and compliance information (CE, UL/cUL, EAC, UKCA, ABS, BV, DNV GL, LR, NK, RINA). RoHS compliant.

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