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Mitsubishi A1SX41 Digital Input Local Unit

Overview

The A1SX41 is a digital input local unit module in the MELSEC-A series.

Mitsubishi product sources identify it as a 32-point digital input module using 24 VDC sink inputs, and the Mitsubishi shop listing also labels it as a discontinued A-series local input unit.

That places it squarely in the class of legacy rack-mounted digital input hardware for installed MELSEC-A systems.

Technical Data

Application Value

The A1SX41 fits well in legacy MELSEC-A control racks, machine automation cabinets, utility systems, conveyor controls, and installed Mitsubishi panels where many digital field signals must be collected in one rack slot.

Because it is a 32-point sink input unit, it is especially practical in installations already built around 24 VDC sink-input wiring conventions.

This is an engineering inference based on the module’s published 32DI role and A-series local-I/O position.

Its replacement value is strong in lifecycle support. Since Mitsubishi identifies the model as discontinued, the part is most relevant today in spare-parts sourcing, cabinet restoration, and support of existing MELSEC-A equipment rather than in new system design.

In those situations, exact model continuity is usually the simplest way to keep the original rack design stable.

Replacement and Selection Perspective

For replacement work, the A1SX41 should be matched by input count, sink-input type, and MELSEC-A rack role, not only by general module appearance.

In real cabinets, the difference between sink input and other digital-input styles affects field-device compatibility and wiring expectations. 

Matching the same 32-point 24 VDC sink input configuration is usually the safest choice.

FAQ

Q1: What kind of module is A1SX41?
It is a MELSEC-A digital input local unit module, designed to add 32 digital sink inputs to a Mitsubishi PLC rack. It is not a CPU or mixed I/O controller.

Q2: What applications fit it best?
It fits installed MELSEC-A automation panels, machine cabinets, and utility systems where many digital field inputs must be collected within the original rack architecture.

This is an engineering inference based on the module’s published 32-point local-input role.

Q3: Why is the sink input type important?
Because digital input style affects field wiring and device compatibility. If the installed machine is wired for sink-type digital input behavior, replacing the module with a different input type can create immediate startup and wiring issues.

Q4: Why is exact model matching especially useful on legacy A-series systems?
Because older rack systems are often documented, wired, and addressed around specific I/O modules.

Replacing the same module usually preserves the original cabinet structure and reduces commissioning risk more effectively than adapting another series. 

This is an engineering inference based on the module’s published local-I/O role and discontinued status.

Q5: What should be checked before ordering?
Check the installed part number, confirm the 32-point 24 VDC sink input requirement, and make sure the cabinet is built around the same MELSEC-A local rack arrangement.