AX41C MITSUBISHI PLC MODULE Free shipping New in box

Mitsubishi AX41C | MELSEC-A Series 32-Point DC Digital Input Module — 12–24VDC / 3–7mA Sink / Conformal Coated / Full-Size A-Series

The "C" in AX41C — Conformal Coating for Chemical Environments

The MELSEC-A series 32-point DC input module exists in two variants: the AX41 (standard) and the AX41C (this module). The suffix "C" designates conformal coating applied to the module's PCB. Conformal coating is a protective lacquer applied over the circuit board after assembly, sealing the solder joints, traces, and component leads against moisture, corrosive gases, dust, and chemical vapours.

For standard factory automation — clean, climate-controlled electrical panels — the AX41 is adequate. For installations in environments where chemical exposure is a realistic condition (chemical processing, paint shops, fertiliser production, coastal facilities with salt air), the AX41C's coated board survives where the standard AX41 would eventually suffer corrosion-related failures.

The functional specifications — 32 channels, 12–24VDC, 3–7mA per input, NPN sink — are identical between the AX41 and AX41C. The distinction is entirely in environmental robustness.

Key Specifications

AX41C in the MELSEC-A Module Family Context

The MELSEC-A full-size series digital input modules span several variants:

• AX40: 16-point, 24VDC
• AX41: 32-point, 12/24VDC, standard
• AX41C (this module): 32-point, 12/24VDC, conformal coated
• AX41-UL: 32-point, UL-rated variant

For existing MELSEC-A systems in standard environments that have failed AX41 modules, the AX41C replaces the AX41 directly — the conformal coating adds environmental protection without any functional or wiring difference. In the reverse direction, an AX41 can substitute for an AX41C in non-chemical environments if the C variant is unavailable.

Application Scenarios

Chemical processing plant control: MELSEC-A system managing reactor inlet valves, feed pump status, and level switch inputs. Chemical vapours in the panel area corrode uncoated PCBs over time. The AX41C's conformal coating extends service life in this environment.

Coastal industrial facility: Salt air penetration into electrical panels causes premature corrosion on standard boards. The AX41C provides the corrosion resistance required for reliable long-term operation near marine environments.

Legacy MELSEC-A maintenance: An installed AX41C fails after years of service. A direct replacement returns the input channel count, address mapping, and field wiring connections to operation without any system modification.

FAQ

Q1: What is the functional difference between the AX41 and AX41C?

None. The 32-point, 12–24VDC, 3–7mA sink input function is identical. The AX41C adds conformal coating to the PCB for chemical and moisture resistance. In non-chemical environments, the AX41C replaces an AX41 directly. In chemical environments, specifying the AX41C is the correct choice.

Q2: Is the AX41C compatible with AnS-series (A1S slim) racks?

No. The AX41C is full-size A-series format. It fits full-size A-series racks (A32B, A38B, A68B, etc.). The A1S slim equivalent for 32-point 12/24VDC input is the A1SX41. Confirm the rack type (full-size A or A1S slim) before ordering.

Q3: What is the GX Developer or GX Works assignment for the AX41C input channels?

In the MELSEC-A CPU's I/O assignment, each AX41C slot is allocated 32 X-device addresses starting at the address assigned to that slot position. The first input maps to the base X address of the slot; the 32nd input maps to the base address plus 31. The programme accesses each input using standard X-contact instructions at the assigned addresses.

Q4: Can the AX41C be replaced by a Q-series or iQ-R module in an existing A-series rack?

No. MELSEC-A full-size racks accept only A-series I/O modules. Q-series and iQ-R modules use physically different slot connectors and are not interchangeable. Migrating from a MELSEC-A system to a newer platform requires replacing the entire rack and CPU, not just substituting individual I/O modules.

Q5: What is the MELSEC-A system lifecycle context for the AX41C?

The MELSEC-A series (full-size) was Mitsubishi Electric's first modular PLC generation, now fully discontinued. The AX41C is a legacy spare — it is no longer manufactured but remains in service globally in machines built through the 1980s and 1990s. The aftermarket carries tested AX41C units sourced from decommissioned equipment.