Mitsubishi QX42 MELSEC-Q High-Density Digital Input Module

Product Overview

Mitsubishi QX42 is a MELSEC-Q series high-density digital input module used in PLC automation systems, machine control panels, production line equipment, and factory maintenance replacement projects. It is designed for applications where multiple discrete field input signals need to be collected into a Q series PLC system for machine logic, sequence control, alarm monitoring, and equipment status detection.

This model is suitable for systems with a larger number of input points, such as packaging lines, conveyors, material handling machines, assembly stations, and production equipment. QX42 is often searched by maintenance engineers when an installed MELSEC-Q input module needs replacement or when a control cabinet requires compatible spare parts.

Main Features

• MELSEC-Q series high-density digital input module
• Used for multiple discrete input signals in PLC control systems
• Suitable for sensors, switches, interlocks, and machine status feedback
• Helps support compact cabinet design with high input density
• Useful for maintenance replacement and production line recovery

Technical Specifications

Compatible System and Applications

QX42 is used in MELSEC-Q PLC systems with Q series CPU modules, base units, power supply modules, output modules, analog modules, positioning modules, and communication modules. It is suitable for production lines, automated machinery, conveyor systems, material handling equipment, test systems, assembly machines, and factory control panels requiring high-density input collection.

Maintenance and Replacement Notes

When replacing QX42, confirm the full model number, input voltage, point count requirement, wiring connector, field power supply, common wiring method, base unit slot, and original PLC program. Input signal problems may also come from field devices, damaged cables, wrong connector wiring, power supply failure, or parameter configuration errors.

Related Models

Related models include QX42, QX41, QX40, QX40-S1, QX41-S1, QX42-S1, QY42P, QY41P, QY40P, and QY50. These models may differ by input density, wiring connector, voltage type, output function, common structure, and system application.

Inquiry and Supply Notes

DF Automatic supplies Mitsubishi MELSEC-Q digital input modules, digital output modules, analog modules, CPU modules, communication modules, power supply modules, base units, HMI panels, servo systems, inverter drives, and industrial automation spare parts for factory maintenance, spare parts replacement, and PLC system repair.

Company Profile

DF Automatic supplies industrial automation spare parts, control system components, and replacement parts to customers worldwide.

Our product range covers PLC modules, servo drives, servo motors, variable frequency drives, HMI panels, industrial sensors, pneumatic components, hydraulic components, power supplies, electrical control devices, and industrial communication modules.

These products are used in CNC machinery, packaging equipment, robotics, production lines, water treatment systems, machine rebuilding, equipment maintenance, and other industrial automation applications.

We assist customers with model identification, part number verification, replacement part sourcing, quotation preparation, packing confirmation, and international shipping coordination. Before quotation, customers may provide complete model numbers, order codes, product photos, nameplate information, or technical specifications for verification.

For discontinued, legacy, or difficult-to-source components, we can also help check possible replacement options based on the exact model, hardware configuration, electrical specifications, communication interface, and application requirements.

Our objective is to provide clear product identification, practical sourcing support, reliable order handling, and efficient communication for industrial automation maintenance and spare parts procurement.

Service Scope

• PLC modules, controllers, and control system components  

• Servo drives, servo motors, and motion control components

• Variable frequency drives and AC drives

• HMI operator panels and industrial displays

• Industrial sensors, pressure measurement devices, load cells, and related components

• Pneumatic valves, cylinders, fittings, and accessories

• Hydraulic pumps, valves, cylinders, and control components

• Industrial power supplies, relays, contactors, circuit breakers, cables, and connectors

• Industrial Ethernet, fieldbus, and communication modules

• Legacy and discontinued automation spare parts

• Replacement part identification and model cross-checking

Industries Served

Our products and sourcing services support a wide range of industrial applications, including:

• CNC machinery

• Packaging machinery

• Robotics and automated equipment

• Factory automation and production lines

• Water treatment systems

• Machine building and equipment rebuilding

• Industrial maintenance and repair

• OEM equipment users

• System integrators

• Maintenance companies

• Industrial distributors

Why Choose DF Automatic

Model and Part Number Verification

We check model numbers, order codes, nameplate information, and product specifications before quotation to reduce the risk of incorrect part selection.

Support for Legacy and Discontinued Parts

We assist with sourcing older automation components and checking compatible or replacement options where applicable.

Efficient Quotation Support

Customers can send individual models or complete spare parts lists for quotation and availability checking.

International Order Coordination

We support packing confirmation, shipment preparation, and international logistics coordination according to order requirements.

Flexible Procurement Support

We can handle single replacement parts, urgent maintenance requirements, and larger industrial spare parts purchase lists.

Inquiry Information

For faster product confirmation and quotation, please provide as much of the following information as possible:

• Complete model number

• Part number or order code

• Product quantity

• Product photos

• Nameplate photos

• Required condition

• Technical specifications

• Existing machine or system information

• Destination country or shipping requirements

Important Note

Product availability, condition, price, lead time, configuration, and replacement options depend on the exact model number, part number, order quantity, technical requirements, and current supply conditions.

For products with multiple hardware versions, firmware versions, electrical specifications, communication options, or regional variants, the complete nameplate and order code should be confirmed before purchase.