The QY41P is Mitsubishi Electric’s 16-point transistor source (PNP) digital output module for the MELSEC-Q programmable controller series with screw terminal field wiring — providing 16 optically isolated 24 VDC source (PNP) transistor output points with a 18-terminal screw terminal block for direct field wire connection, the 16-point screw terminal source output module that pairs naturally with the QX41 sink input module in MELSEC-Q systems requiring PNP source outputs with straightforward field wiring. The QY41P is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the QY41P?
The QY41P is a MELSEC-Q series digital output module providing 16 optically isolated 24 VDC source (PNP) transistor output points with an 18-terminal screw terminal block for direct field wiring — the screw terminal, 16-point, source output counterpart to the QY40P (40-pin connector, 32-point). Each output point sources 24 VDC to the connected load when the output is ON (PNP transistor conducts, connecting the load’s supply terminal to the output), with 0.1 A continuous rated current per point. The screw terminal field wiring of the QY41P provides the same wiring simplicity advantages as the QX41 input module — direct conductor termination without connector assembly, individual wire accessibility for fault tracing, and compatibility with 0.3–0.75 mm² conductors terminating directly under the M3 screw clamp. The QY41P is rated at 0.1 A per output point — the same as the QY40P — but provides 16 points in a 27.4 mm wide module with screw terminals rather than 32 points with 40-pin connector. For MELSEC-Q systems where output point density per slot is less critical than wiring simplicity and the load current per output does not exceed 0.1 A, the QY41P is the standard PNP source output module specification.
Key Technical Specifications
- Model: QY41P
- Output Points: 16
- Output Type: Transistor source (PNP) — sources 24 VDC to load when ON
- Output Voltage: 20.4–28.8 VDC (external 24 VDC supply required)
- Output Current: 0.1 A per point maximum
- Total Simultaneous Output Current: 1.6 A (all 16 points ON simultaneously)
- Response Time: 1 ms (OFF→ON and ON→OFF)
- Short-Circuit Protection: Built-in (activates at approximately 0.15 A per point)
- Leakage Current (OFF): ≤0.1 mA
- Isolation: Optical, per output point
- Field Wiring: 18-terminal screw terminal block
- External Supply: 24 VDC required (separate from internal 5 VDC bus)
- Power Consumption: 5 VDC internal bus, approx. 0.09 A
- Operating Temperature: 0°C to 55°C
- Dimensions (W × H × D): 27.4 mm × 98 mm × 89.3 mm
- Weight: Approx. 0.12 kg
Architecture & Design Overview
The QY41P implements PNP source output transistor circuits — each output uses a P-channel MOSFET or PNP bipolar transistor that connects the output terminal to the 24 VDC external supply when the PLC output device (Y address) is ON. The optical isolator between the Q-series internal bus and the output transistor gate/base provides galvanic isolation between the PLC logic circuits and the field wiring, preventing field-side voltage transients from reaching the Q-series internal bus. The 0.1 A per point current limit is enforced by the output transistor’s saturation current capability and the built-in short-circuit protection circuit — when a connected load draws more than approximately 0.15 A (short circuit or severe overload), the protection circuit activates, disabling the affected output and potentially indicating the fault via the module’s output status LEDs. The QY41P’s screw terminal block uses a proven clamp terminal design with a captive screw that compresses a wire clamp plate onto the inserted conductor — this design provides reliable contact pressure with standard screwdriver tools without requiring special crimping tools. The 18-terminal block accommodates 16 output terminals plus one external 24 VDC supply terminal and one 0 VDC common terminal — the supply and common terminals must be connected to the external 24 VDC supply for the output transistors to operate, as the QY41P’s output stage power is entirely sourced from the external supply rather than the Q-series internal 5 VDC bus. The LED status indicators on the QY41P’s front panel show the ON/OFF state of each output individually — valuable for field commissioning and fault diagnosis without requiring GX Works2 online connection.
Frequently Asked Questions
Q: Can the QY41P and QX41 be used together to form a complete 16-input/16-output module pair for compact MELSEC-Q I/O?
A: Yes. The QX41 (16-point sink input) and QY41P (16-point source output) are the standard complementary pair for European-specification MELSEC-Q I/O panels — QX41 for NPN sensor inputs and QY41P for PNP actuator outputs. Both modules use the 18-terminal screw block wiring convention, 27.4 mm width, and compatible external 24 VDC supply requirements. A Q35B base unit with Q00UCPU + Q61P power supply + QX41 + QY41P provides a complete compact 16/16 I/O MELSEC-Q system in a 5-slot main base with one slot remaining for an intelligent function module.
Q: What is the difference between the QY41P (16-point screw terminal) and the QY50 (16-point screw terminal sink output)?
A: The QY41P provides PNP source outputs — the output sources 24 VDC to the load. The QY50 provides NPN sink outputs — the output pulls the load terminal to 0 VDC when ON. Both use screw terminal field wiring at 16 points. The selection is determined by the load device’s input type: PNP-sourced 24 VDC to activate (specify QY41P) or NPN-sunk 0 VDC to activate (specify QY50). European machine specifications typically require PNP source outputs (QY41P), while Japanese and some Asian specifications use NPN sink outputs (QY50).
Q: Can the QY41P’s 0.1 A per point limit be exceeded for a short pulse duration without triggering the overcurrent protection?
A: The QY41P’s 0.1 A continuous rating and the short-circuit protection activation at approximately 0.15 A applies to both continuous and pulsed operation — the protection circuit is not significantly slower than the output transistor, so brief current pulses above 0.15 A during capacitive load charging (solenoid valve coil initial energisation) may activate the protection. For loads with high inrush current (large solenoid coils with significant inductance), verify the peak current at energisation does not exceed 0.15 A — use an external series resistor to limit peak inrush if necessary, or specify an external relay driven by the QY41P to switch the high-inrush load.
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