Mitsubishi AY81 – 16-Point Digital Output Local Unit Module | MELSEC-A Series PLC Platform
Engineering Background
The Mitsubishi AY81 is a digital output local unit module designed for the MELSEC-A Series programmable logic controller (PLC) platform — one of Mitsubishi Electric’s most widely deployed industrial automation architectures. Built to meet the demanding requirements of discrete manufacturing, process control, and infrastructure automation, the AY81 provides reliable transistor-based output switching for field devices including solenoid valves, relays, indicators, and actuators.
Product Positioning
As a local unit module, the AY81 mounts directly in the MELSEC-A Series base unit alongside the CPU, eliminating the need for remote I/O infrastructure in compact or single-rack control architectures. It is the preferred output module for engineers specifying high-density, low-latency digital control in space-constrained panels or retrofit applications where MELSEC-A hardware is already installed.
Mitsubishi AY81 – Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | AY81 |
| Manufacturer | Mitsubishi Electric |
| Series / Platform | MELSEC-A Series |
| Module Type | Digital Output – Local Unit |
| Number of Output Points | 16 points |
| Output Type | Transistor (sink type) |
| Rated Load Voltage | 12–24 VDC |
| Max Load Current per Point | 0.1 A |
| Max Load Current (all points ON) | 1.6 A |
| Isolation Method | Photocoupler |
| Response Time (OFF→ON) | ≤ 1 ms |
| Response Time (ON→OFF) | ≤ 1 ms |
| Internal Current Consumption | 5 VDC, 0.16 A |
| Operating Temperature | 0 °C to 55 °C |
| Storage Temperature | -25 °C to 75 °C |
| Operating Humidity | 5% to 95% RH (non-condensing) |
| Vibration Resistance | IEC 61131-2 compliant |
| Weight | Approx. 200 g |
| Country of Origin | Japan |
| Connector Type | 40-pin connector (MELSEC-A bus) |
| Applicable CPU Modules | A1S, A2S, A2US, A3, A3N, A3V, A3H, A3M and compatible |
| Standards Compliance | UL, CE, cUL |
Proven Application Environments
- Discrete Manufacturing: Conveyor control, robotic end-effector switching, machine tool sequencing
- Process Industries: Solenoid valve actuation in chemical dosing, water treatment, and HVAC systems
- Automotive Assembly: Body-in-white welding lines, paint shop automation, press control
- Infrastructure & Utilities: Pump station control, substation auxiliary switching, tunnel ventilation
- Retrofit & Maintenance: Direct replacement for aging MELSEC-A output modules in legacy systems
- Panel Builders: Compact single-rack control panels requiring high-density digital output
Engineering Advantages
- Photocoupler Isolation: Full galvanic isolation between PLC logic and field wiring eliminates ground loop interference and protects the CPU from inductive load transients.
- Fast Switching Response: ≤ 1 ms ON/OFF response time supports high-speed sequencing and precise timing control without software compensation.
- High-Density 16-Point Layout: Maximizes I/O density per rack slot, reducing hardware cost and panel footprint versus lower-density alternatives.
- Proven MELSEC-A Bus Compatibility: Native bus interface ensures zero configuration overhead — plug-in replacement for existing AY81 installations.
- Robust Industrial Rating: Rated for 0–55 °C operation and IEC 61131-2 vibration compliance, suitable for harsh factory floor environments.
- UL/CE Certified: Meets international safety standards for global machine builder and OEM applications.
System Architecture & Signal Flow
The AY81 interfaces directly with the MELSEC-A Series backplane bus. Output data is written by the CPU to the module’s output latch register via the internal bus. Each output point drives a photocoupler, which in turn switches a transistor connected to the external load circuit. The external power supply (12–24 VDC) is provided by the user and is fully isolated from the 5 VDC internal bus. A shared common terminal (COM) is used per output group, allowing flexible wiring configurations for mixed-voltage field devices within the rated range.
Signal Flow: CPU Output Register → Internal Bus → Output Latch → Photocoupler → Transistor Switch → Field Device (Load) → External 12–24 VDC Supply → COM
Sourcing & Quality Verification
- Authentic Origin: All AY81 modules supplied by Konmask.com are sourced from authorized Mitsubishi Electric distribution channels or verified industrial surplus with full traceability documentation.
- Pre-Shipment Inspection: Each unit undergoes visual inspection, label verification, and functional continuity checks prior to dispatch.
- Packaging Integrity: Modules are shipped in anti-static packaging with original or equivalent protective foam inserts to prevent transit damage.
- Counterfeit Risk Mitigation: We do not source from unverified gray-market channels. Procurement engineers can request lot documentation and inspection reports upon order confirmation.
Procurement Process
- Confirm Compatibility: Verify your MELSEC-A CPU model and base unit slot availability against the applicable CPU list above.
- Request a Quote: Contact [email protected] for volume pricing, lead time confirmation, and availability on specific lot dates.
- Place Order: Orders can be placed directly via this product page or via purchase order (PO) for approved B2B accounts.
- Shipping & Lead Time: In-stock units ship within 1–3 business days. Express DHL/FedEx international shipping available. HS Code: 8537.10 (programmable controllers).
- After-Sales Support: Technical support available via email or phone for installation, wiring, and compatibility questions.
Technical FAQ
- Q: Is the AY81 compatible with MELSEC-AnS Series base units?
- A: The AY81 is designed for the standard MELSEC-A Series (A-format) base units. For AnS (slim) series, the equivalent module is the AY81S. Verify your base unit form factor before ordering.
- Q: Can the AY81 drive 24 VDC solenoid valves directly?
- A: Yes, within the 0.1 A per-point current limit. For solenoid valves with higher inrush current, use an interposing relay or solid-state relay (SSR) on the output.
- Q: What is the difference between AY81 and AY81E?
- A: The AY81E is the European CE-marked variant with identical electrical specifications. Both are functionally interchangeable in MELSEC-A systems.
- Q: Is this module still in production?
- A: The MELSEC-A Series has reached end-of-life (EOL) status. Konmask.com maintains stock of genuine AY81 modules to support ongoing maintenance and retrofit projects. Contact us for long-term supply agreements.
- Q: Can I mix AY81 with input modules (e.g., AX80) in the same base unit?
- A: Yes. MELSEC-A Series base units support mixed I/O module configurations. Slot assignment is configured in the CPU parameter settings (GX Developer or SW□D5C-GPPW).
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