The Mitsubishi QY40P is a MELSEC-Q Series digital transistor output module. It is a highly reliable, standard card used for driving low-current DC loads like relays, indicator lamps, and small solenoid valves.
Core Specifications
| Feature | Specification Details |
| Output Type | Transistor Output (Sink / Sinking type) |
| Number of Points | 16 points |
| Rated Load Voltage | 12 to 24 VDC (operational limit: 10.2 to 26.4 VDC) |
| Max. Load Current | 0.1 A / point, 1.6 A / common block |
| Response Time | Off to On: ≤ 1 ms | On to Off: ≤ 1 ms |
| Common Terminal Layout | 16 points sharing 1 common line (18-point screw terminal block) |
| Surge Suppressor | Zener diode |
| Protection Features | Short-circuit protection, Overload/Thermal protection |
| Internal Current Consumption | 60 mA (5 VDC) |
Key Technical Characteristics
- Sink Type Architecture:Â As a sinking module, the load is connected between the positive voltage rail (+24V) and the output pin. When the PLC channel turns on, it switches the path to ground (COM-).
- Built-in Protection:Â The “P” suffix denotes enhanced protection circuitry. It features overload and short-circuit protection, reducing the risk of burning out the internal electronics if a field component or cable shorts out.
- Compact Footprint:Â Standard Q-series form factor with an 18-point removable terminal block, making field replacement quick without having to disconnect individual wires.






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