The QX10 is a 16-point DC sink-type digital input module from Mitsubishi Electric for the MELSEC-Q series programmable logic controller platform, accepting 24 V DC field signals from sensors, switches, and other discrete field devices. In stock at Atlantech Drives. Request your quote within 24–48 hours with worldwide shipping and 12-month warranty.
What Is the Mitsubishi QX10?
The QX10 is one of the standard-density digital input modules in the MELSEC-Q I/O range, providing 16 sink-type (NPN) input points in a single base slot. It is designed for connection to PNP-output field devices — including proximity switches, photoelectric sensors, and limit switches with PNP transistor outputs — which are standard in European and Asian machine building practice. Each input point is optically isolated from the internal bus, protecting the CPU from transient overvoltage and electrical noise common in industrial field wiring environments. The QX10 uses screw terminal block wiring, making it compatible with standard panel wiring practices without requiring specialist connector tooling.
Key Technical Specifications
- Number of input points: 16
- Input type: DC sink (NPN compatible)
- Rated input voltage: 24 V DC (+20%/–15%)
- Rated input current: Approx. 4 mA per point
- ON voltage/current: 19 V DC min / 3 mA min
- OFF voltage/current: 11 V DC max / 1.7 mA max
- Input response time: 1 ms (default, adjustable 0.1–70 ms via parameters)
- Isolation: Optical isolation between input circuits and internal bus
- Common terminal configuration: 16-point common
- Wiring: Screw terminal block (18-point, removable)
- Number of occupied I/O points: 16
- Power consumption: 5 V DC, 0.09 A (internal bus)
- Operating temperature: 0 to 55°C
- Dimensions (W × H × D): 27.4 × 98 × 90 mm
Compatibility & System Integration
The QX10 is compatible with all MELSEC-Q CPU modules and mounts in any I/O slot of a Q series main base (Q3□B, Q5□B, Q6□B) or extension base unit. I/O addresses are assigned automatically by GX Works2 based on slot position — no manual parameter configuration is required for basic input use. The QX10 is sink type only and is not source/sink selectable; for source-type (PNP-compatible) input wiring, specify the QX40 instead. The adjustable input response time (0.1 ms to 70 ms, configurable per module in GX Works2 parameters) is useful for filtering contact bounce on mechanical switches without adding ladder-based timer logic. The QX10’s 16-point density and screw terminal wiring make it the standard choice for general-purpose machine I/O where ease of field wiring and straightforward maintenance access are priorities. For applications requiring higher I/O density per slot, the QX42 (64-point, 5/12 V, connector type) or QX41 (32-point, 24 V, connector type) provide alternatives at the cost of requiring connector accessories for field wiring termination.
Installation Advice
Connect the 24 V DC sensor supply positive to the input terminals and the sensor output (NPN open collector) to the input point terminal, with the COM terminal connected to the 24 V DC negative. Verify that field device output current in the ON state meets the QX10’s minimum ON current of 3 mA — some long-range or energy-saving proximity sensors have output currents below this threshold and will not reliably switch the QX10 input to the ON state. For 2-wire proximity switches with residual leakage current in the OFF state, verify that the leakage current does not exceed the QX10’s maximum OFF current of 1.7 mA — if it does, the input will register as permanently ON regardless of the sensor’s actual detection state. Use the input response time parameter to filter mechanical contact bounce: set to 10 ms for standard limit switches and push buttons; leave at the default 1 ms for electronic proximity sensors where response speed matters. Route 24 V DC input wiring separately from 230 V AC power wiring and motor cables, maintaining a minimum separation of 100 mm in the panel.
Frequently Asked Questions
Q: What is the difference between QX10 and QX40?
A: The QX10 is sink type only (NPN-compatible, PNP-output field devices), while the QX40 is source/sink selectable, compatible with both NPN and PNP output field devices by changing the COM terminal wiring. If the installation mixes NPN and PNP sensor outputs on the same module, the QX40 is the required selection. For exclusively NPN sensor installations, the QX10 is the simpler and lower-cost option.
Q: Can the input response time of the QX10 be set independently per input point?
A: No. The QX10 input response time is set per module, not per individual point. All 16 points on the same QX10 module share the same response time setting configured in GX Works2 module parameters. If different response times are needed for different input types, they must be placed on separate QX10 modules in different base slots.
Q: Is the QX10 compatible with MELSEC iQ-R base units?
A: No. MELSEC-Q modules are not compatible with MELSEC iQ-R base units. The iQ-R series uses a different module form factor and bus interface. The equivalent iQ-R input module is the RX10.
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