Mitsubishi Electric Corporation QX80 I/O Module

The Mitsubishi Electric Corporation QX80 I/O Module is a 16-point digital input module for the MELSEC-Q Series PLC racks, providing 24 V DC input signals for factory automation and process control applications. It is designed for sensor input monitoring, limit switches, pushbuttons, and machine interlocks, and supports mounting in a Q-series base unit rack with screw-terminal wiring. The module offers 16 input points with 24 V DC operation, sink/source compatible input types (module dependent), a per-point input current of approximately 4–7 mA, and a typical response time around 10 ms, with a 16-point common and photocoupler isolation for electrical separation. Internal current consumption is about 0.19 A at 5 V DC. Common replacements include Mitsubishi QX81, QX40, and QX82, making it suitable for I/O expansion, retrofit, or replacement in MELSEC-Q PLC systems that require reliable digital input signal acquisition.