Mitsubishi Electric Melsec Programmable Controller AX40Y10C AX4OY1OC

Mitsubishi AX40Y10C Mixed Digital I/O Unit Module

Overview

The AX40Y10C is a mixed digital input/output local unit module in the MELSEC-A series. Mitsubishi’s own product-shop entry identifies it as a 32 I/O mixed module with 16 digital inputs (24VDC, sink) and 16 digital outputs (relay, NO contacts).

It is listed as a local I/O unit rather than a CPU or remote communications part, which places it firmly in the rack-based field interface layer of an installed MELSEC-A system.

Technical Data

Application Value

The AX40Y10C fits well in legacy MELSEC-A control racks, utility panels, machine cabinets, and installed Mitsubishi automation systems where both digital inputs and relay outputs must be handled from one rack slot.

Because it combines 16 sink inputs and 16 relay outputs in one module, it is especially practical in older systems where panel space is limited and the original rack design was built around combination I/O modules rather than separate input and output cards.

This is an engineering inference based on the module’s published mixed-I/O format and MELSEC-A local-unit role.

Its strongest value today is in maintenance and lifecycle support. Mitsubishi’s product-shop entry marks the model as discontinued, which is consistent with the way combination I/O modules like this are now mainly sourced for installed-base support, spares, and control-cabinet restoration rather than new platform design.

Replacement and Selection Perspective

For replacement work, the AX40Y10C should be matched by input type, output type, point count, and MELSEC-A rack compatibility, not just by physical size. In practical terms, the critical details are the 16 sink inputs and 16 relay NO outputs in one combined module. Matching the same module usually preserves rack layout, field wiring, and control behavior with less rework.

FAQ

Q1: What kind of module is AX40Y10C?
It is a Mitsubishi MELSEC-A mixed digital I/O module, combining 16 digital inputs and 16 relay outputs in one local rack unit.

Q2: What applications fit it best?
It fits installed MELSEC-A machine and utility panels where a combination I/O card is already part of the rack design.

This is an engineering inference based on the published mixed-I/O format and local-unit classification.

Q3: Why is the sink input type important?
Because field-device wiring must match the input logic style. If the installed machine is wired for 24VDC sink inputs, replacing the module with a different input type can create immediate commissioning issues.

Q4: Why are relay NO outputs useful here?
Relay NO outputs are widely used in older industrial panels because they work well with many field loads and keep the output side electrically flexible.

In replacement work, preserving that relay behavior is often more important than changing to a newer output style.

This is an engineering inference based on the model’s published relay-output configuration.

Q5: What should be checked before ordering?
Check the installed part number, confirm the need for 16 sink inputs and 16 relay NO outputs, and verify that the cabinet is built around the same MELSEC-A local-rack arrangement.