MITSUBISHI
Mitsubishi QX81 MELSEC‑Q 32‑Point DC Input Module 24V Source Type
Mitsubishi QX81 MELSEC‑Q 32‑Point DC Input Module 24V Source Type
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Mitsubishi Electric MELSEC‑Q series digital input module with 32 source‑type (positive common) channels. Rated input voltage 24 V DC (+20 %/ –15 %), rated input current approx. 4 mA (6 mA for QX81‑S2 variant). Configurable input response time (1, 5, 10, 20, 70 ms, default 10 ms). 32 points share a single common. Photocoupler isolation between input terminals and PLC power supply. 37‑pin D‑sub connector interface. 98 (H) × 27.4 (W) × 90 (D) mm, 0.16 kg. For MELSEC‑Q series main base units and extension base units. Suitable for high‑density digital signal acquisition in factory automation, process control, and machine automation systems.
Applications:
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Digital signal acquisition from sensors, limit switches and pushbuttons
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High‑density input expansion for Q series PLC systems
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Conveyor control and material handling systems
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Packaging machinery and assembly line monitoring
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Factory automation and process control input panels
Core Specifications:
| Parameter | Specification |
|---|---|
| Number of inputs | 32 (source type, positive common) |
| Rated input voltage | 24 V DC (+20 % / –15 %, ripple ≤ 5 %) |
| Rated input current | Approx. 4 mA (6 mA for QX81‑S2 variant) |
| 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 (default 10 ms, set via PLC parameter) |
| Isolation method | Photocoupler |
| 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:
| Parameter | Specification |
|---|---|
| Internal current consumption (5 V DC) | 75 mA (TYP., all points ON) |
| Occupied I/O points | 32 (I/O assignment: Input 32 points) |
| Common terminal arrangement | 32 points / 1 common (common terminals: 17, 18, 36) |
| External connection | 37‑pin D‑sub connector (A6CON1E, A6CON2E, A6CON3E optional) |
| Applicable wire size | 0.088 ‑ 0.3 mm² |
| Dimensions (H × W × D) | 98 mm × 27.4 mm × 90 mm |
| Weight | 0.16 kg |
| Operating temperature | 0 °C … 55 °C |
| Storage temperature | –20 °C … 75 °C |
| Operating humidity | 10 % … 90 % (non‑condensing) |
System Integration:
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This input module belongs to the Mitsubishi Electric MELSEC‑Q series.
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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.
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Compatible with Q series CPU modules (Q00J, Q00, Q01, Qn, QnH, QnPH, QnPRH, QnU series).
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Input response time is set via I/O assignment parameters in GX Works2 or GX Developer.
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Requires optional A6CON1E (screw terminal block conversion module) for field wiring.
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For detailed wiring and configuration, refer to the MELSEC‑Q series User's Manual (Hardware Design, Maintenance and Inspection).
Standards & Compliance:
Refer to manufacturer official documentation for certification and compliance details (CE, UL, cUL).
Related Products:
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QX80 – 16‑point DC input module (source type)
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QX81‑S2 – 32‑point DC input module, 6 mA rated input current (higher sensitivity)
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QY10 – 16‑point relay output module
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QY80 – 16‑point source transistor output module
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A6CON1E – 37‑pin D‑sub screw terminal block conversion module
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A6CON2E – 37‑pin D‑sub spring clamp terminal block conversion module
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Q61P – Power supply module for Q series base unit
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