Mitsubishi MELSEC Q Series QH42P Digital I/O Combined PLC Module

Tired of losing production time because your controller cannot keep up with fast digital signals? The Mitsubishi MELSEC Q Series QH42P Digital I/O Combined PLC Module gives you a reliable way to read and write 64 points of data in one compact unit. It is built for factories that need precise on-off control of sensors, switches and actuators. If you have missed alarms or delayed motor starts, this module fixes the problem by delivering clean 24 V DC signals and fast response.

Mitsubishi MELSEC Q Series QH42P Digital I/O Combined PLC Module

Many small to medium automation projects struggle with wiring clutter and limited I/O slots. When you run out of points, you either add another PLC or compromise on safety monitoring. This creates extra cost and more points of failure. The QH42P solves the issue by combining 32 inputs and 32 outputs in a single 40-pin connector, keeping your rack tidy and your program simple. It works with the MELSEC-Q series, so you do not need extra configuration.

Usages of Mitsubishi

Use the module in a packaging line to monitor limit switches, photo-electric sensors and to drive conveyor brakes. Install it in a water treatment plant to read level probes and to turn on pumps. It fits well in a building management system for door contacts and HVAC fan control. Anywhere you need fast, reliable on/off signals, the QH42P can replace separate input and output cards.

Benefits

• Reduces wiring time because inputs and outputs share one connector.
• Provides 64 points in a single slot, freeing rack space for other functions.
• Uses 24 V DC common voltage, matching most industrial sensors and actuators.
• Offers 0.1 A per point, enough for most indicator lights and small relays.
• Works seamlessly with existing MELSEC-Q PLCs, so no extra software is required.

Key Features

• 32 digital inputs, 24 V DC, positive common, sink type.
• 32 digital outputs, transistor sink, 12-24 V DC load range.
• 0.1 A typical output current per point.
• 40-pin high-density connector for quick wiring.
• Compact 1-U size fits standard Q-Series racks.
• Compatible with MELSEC-Q series CPUs and programming tools.
• Supports fast scan cycle for real-time control.
• Built-in diagnostics for input short or open detection.
• Rated for industrial temperature range and vibration.
• Easy replacement without changing ladder logic.

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