The Mitsubishi Electric QX42-S1 input unit for MELSEC-Q is a 24V DC digital input module that connects external sensors and switches to a MELSEC-Q PLC, drawing 4 mA of current. As part of the MELSEC-Q I/O system, it provides the digital inputs needed to monitor external signals in industrial automation. Common applications include control panels and manufacturing lines where 24V DC sensing is standard.
