Mitsubishi A1SX41 – 16-Point 24VDC DC Input Module | MELSEC-A Series Platform
Engineering Background
The Mitsubishi Electric MELSEC-A Series established itself as a cornerstone of industrial automation across Asia-Pacific and global manufacturing facilities throughout the 1980s–2000s. Designed for high-reliability discrete I/O in demanding environments, the A-Series platform remains widely deployed in automotive assembly, food processing, chemical plants, and infrastructure control systems. Konmask.com specializes in sourcing verified, genuine spare parts to support ongoing maintenance and lifecycle extension of these installed bases.
Product Positioning
The A1SX41 is a 16-point DC input module engineered for the MELSEC-A Series base units (A1S, A2S, A3N, A2N, A3A, etc.). It accepts 24VDC field signals and converts them to logic-level inputs for the CPU, making it the standard choice for proximity sensors, limit switches, push-buttons, and relay contacts in industrial control panels. Its compact slim-line form factor fits the A1S small-format base, reducing panel footprint without sacrificing channel density.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | A1SX41 |
| Manufacturer | Mitsubishi Electric |
| Series / Platform | MELSEC-A (A1S Slim Series) |
| Module Type | DC Digital Input |
| Number of Input Points | 16 points |
| Rated Input Voltage | 24 VDC |
| Input Voltage Range | 20.4 – 28.8 VDC |
| Rated Input Current | Approx. 7 mA / point |
| ON Voltage / Current | ≥ 14.4 VDC / ≥ 4.5 mA |
| OFF Voltage / Current | ≤ 6 VDC / ≤ 1.7 mA |
| Input Impedance | Approx. 3.3 kΩ |
| Response Time (OFF→ON) | 10 ms (default) |
| Response Time (ON→OFF) | 10 ms (default) |
| Isolation Method | Photocoupler (optical isolation) |
| Common Terminal Configuration | 16 points / 1 common |
| Connector Type | 18-pin terminal block (removable) |
| Internal Current Consumption (5VDC) | 70 mA |
| Operating Temperature | 0 – 55 °C |
| Storage Temperature | -25 – 75 °C |
| Humidity | 5 – 95% RH (non-condensing) |
| Weight | Approx. 160 g |
| Applicable Base Units | A1S series slim base units |
| Compatible CPUs | A1SCPU, A1SHCPU, A1SJHCPU, A2SCPU, etc. |
| Standards Compliance | JIS B 3501, IEC 61131-2 |
Proven Application Environments
- Automotive Manufacturing: Body-in-white welding lines, transfer press interlocks, conveyor position sensing
- Food & Beverage: Packaging line limit switches, filling machine level detection, conveyor jam detection
- Chemical & Petrochemical: Valve position feedback, pump run/stop status, safety interlock inputs
- Building Automation & Infrastructure: HVAC control panels, elevator shaft sensors, fire suppression system inputs
- Semiconductor & Electronics Assembly: Pick-and-place machine I/O, wafer handler position sensing
- Water Treatment: Flow switch inputs, level sensor integration, pump status monitoring
Engineering Advantages
- Photocoupler Isolation: Full optical isolation between field wiring and backplane bus eliminates ground loop interference and protects the CPU from field-side transients.
- High Noise Immunity: Designed to IEC 61131-2 Type 1 input specifications, ensuring reliable operation in electrically noisy industrial environments.
- Compact A1S Form Factor: Slim-line module occupies minimal base slot space, ideal for space-constrained control panels.
- 16-Point Density: High channel count per module reduces total module count and wiring complexity for large I/O systems.
- Removable Terminal Block: Field wiring can be disconnected without disturbing module seating, simplifying maintenance and module replacement.
- Wide Input Voltage Tolerance: 20.4–28.8 VDC range accommodates real-world power supply fluctuations without false triggering.
System Architecture & Signal Flow
Field devices (sensors, switches, relay contacts) connect to the A1SX41’s 18-pin removable terminal block. Each input point is optically isolated via a photocoupler, converting the 24VDC field signal to a 5VDC logic signal on the backplane bus. The CPU reads input states via the A-Bus backplane at each scan cycle. The module occupies one slot on any A1S slim-format base unit (A1S5B, A1S6B, A1S8B, A1S12B, etc.) and requires no external power supply beyond the 5VDC backplane supply (70 mA consumption).
Wiring Note: Sink (NPN) and source (PNP) wiring configurations are both supported depending on common terminal polarity. Refer to Mitsubishi Electric Hardware Manual IB-66233 for detailed wiring diagrams.
Sourcing & Quality Verification
- Genuine OEM Parts: All A1SX41 units sourced by Konmask.com are original Mitsubishi Electric manufactured components — no third-party clones or refurbished-as-new units.
- Pre-shipment Inspection: Each module undergoes visual inspection for label integrity, connector condition, and physical damage before dispatch.
- Traceability: Lot codes and date codes are documented where available to support your incoming inspection records.
- Packaging: Shipped in anti-static ESD bags with foam cushioning inside double-wall corrugated cartons to prevent transit damage.
- Condition Options: New surplus (sealed), tested used (functional), and refurbished (reconditioned to OEM spec) — condition clearly stated at time of quotation.
Procurement Process
- Submit Inquiry: Contact us via the product page, email [email protected], or WhatsApp +0086 19859288691 with your required quantity and delivery timeline.
- Quotation: We respond within 1 business day with pricing, lead time, and stock condition details.
- Order Confirmation: Proforma invoice issued upon agreement; payment via T/T bank transfer, PayPal, or trade assurance.
- Quality Check & Dispatch: Pre-shipment inspection completed; tracking number provided within 24–48 hours of payment clearance.
- Delivery: DHL / FedEx / UPS express (3–7 business days worldwide); sea freight available for bulk orders.
- After-Sales Support: 30-day DOA (Dead on Arrival) warranty; technical support available for installation and commissioning queries.
Technical FAQ
Q: Is the A1SX41 compatible with A2N or A3N base units?
A: The A1SX41 is designed for A1S slim-format base units. A2N and A3N use the larger A-Series standard base (A5B, A6B, A8B, A12B) which requires the standard-width AX41 or AX40 input modules. Please confirm your base unit model before ordering.
Q: Can I use NPN (sink) sensors with the A1SX41?
A: Yes. The A1SX41 supports both NPN (sink) and PNP (source) wiring configurations by selecting the appropriate common terminal polarity. Refer to the hardware manual for wiring diagrams.
Q: What is the input response time and can it be changed?
A: Default response time is 10 ms for both ON→OFF and OFF→ON transitions. This is hardware-fixed on the A1SX41; variable response time is available on the A1SX41-S1 variant.
Q: Is this module still in production?
A: The MELSEC-A Series has been discontinued by Mitsubishi Electric. Konmask.com maintains stock of genuine surplus units to support installed-base maintenance. We recommend evaluating migration to MELSEC iQ-R or iQ-F for new projects.
Q: Do you provide a datasheet or hardware manual?
A: Yes. Contact [email protected] and we will provide the relevant Mitsubishi Electric hardware manual (IB-66233 or equivalent) upon request.
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Contact: [email protected] | +0086 19859288691
