MITSUBISHI A1SCPU – High-Performance CPU Module | MELSEC-A Series Platform
Engineering Background
The MITSUBISHI A1SCPU is a core CPU module from the MELSEC-A Series programmable logic controller platform — one of Mitsubishi Electric’s most widely deployed industrial automation architectures. Engineered for demanding discrete and process control environments, the A1SCPU delivers deterministic scan-cycle execution, robust I/O handling, and seamless integration within the MELSEC-A backplane ecosystem. This module has been a trusted backbone in manufacturing, utilities, and infrastructure projects across Asia-Pacific and globally for decades.
Product Positioning
Designed for procurement engineers and maintenance teams sourcing verified replacement or expansion units, the A1SCPU is the entry-level CPU of the MELSEC-A compact series — offering a balance of processing power, program capacity, and cost-efficiency. It is the ideal choice for facilities maintaining legacy MELSEC-A installations or engineers designing new systems requiring proven, field-hardened PLC technology.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | A1SCPU |
| Manufacturer | Mitsubishi Electric (三菱電機) |
| Series / Platform | MELSEC-A Series (AnS CPU) |
| Module Type | CPU Module (Programmable Logic Controller) |
| Program Memory | 8K steps (expandable with memory cassette) |
| Processing Speed | 0.8 µs / basic instruction |
| I/O Points (Max) | 256 points (with extension base units) |
| Internal Relay (M) | 2,048 points |
| Data Register (D) | 1,024 words |
| Timer (T) | 256 points |
| Counter (C) | 256 points |
| Power Supply Voltage | 5 VDC (supplied via base unit) |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -20°C to 75°C |
| Humidity | 10% to 90% RH (non-condensing) |
| Vibration Resistance | 10–57 Hz: 0.075 mm; 57–150 Hz: 9.8 m/s² |
| Shock Resistance | 147 m/s² (3 times each direction) |
| Weight | Approx. 1,140 g |
| Compatible Base Units | A1S38B, A1S52B, A1S55B, A1S58B, A1S65B, A1S68B |
| Programming Software | GX Developer, GX Works2 (A-series mode) |
| Communication Port | RS-422 (programming port) |
| RAS Functions | Self-diagnostics, watchdog timer, battery backup |
| Battery Backup | Program and data retention (lithium battery) |
| Certification | CE, UL (refer to product documentation) |
Proven Application Environments
- Automotive Manufacturing: Body assembly line sequencing, weld controller integration, conveyor PLC networks
- Food & Beverage Processing: Filling line control, CIP cycle management, batch sequencing
- Water & Wastewater Treatment: Pump station automation, dosing control, SCADA integration
- Textile & Printing: Loom control, tension regulation, register mark detection
- Building Automation: HVAC sequencing, elevator control panels, fire suppression systems
- Utilities & Power Distribution: Substation automation, load shedding control, generator management
- Semiconductor Fabrication: Process chamber sequencing, cleanroom environmental control
Engineering Advantages
- Deterministic Execution: Fixed-cycle scan ensures predictable response times critical for high-speed discrete control
- Compact Form Factor: AnS-series slim profile reduces panel footprint without sacrificing I/O capacity
- Proven Reliability: Field-hardened design with decades of deployment in harsh industrial environments
- Broad Compatibility: Supports full range of MELSEC-A I/O, special function, and communication modules
- Battery-Backed Retention: Program and data memory preserved during power loss — critical for 24/7 operations
- GX Works2 Support: Compatible with modern Mitsubishi programming environment for legacy system maintenance
- Extensive Diagnostics: Built-in RAS (Reliability, Availability, Serviceability) functions for rapid fault isolation
System Architecture & Signal Flow
The A1SCPU mounts into Slot 0 of any compatible MELSEC-A slim base unit (A1S38B through A1S68B). The CPU communicates with I/O and special function modules via the internal A-bus backplane at 5 VDC. Program execution follows a cyclic scan: Input Refresh → Program Execution → Output Refresh → END processing. The RS-422 programming port connects directly to a PC running GX Developer or GX Works2 for program upload/download, monitoring, and online modification. For networked installations, MELSEC-NET/MINI-S3 or CC-Link communication modules can be added to adjacent base slots.
Sourcing & Quality Verification
- All units sourced through verified industrial distribution channels with full traceability
- Each module undergoes incoming inspection: visual check, label verification, and functional power-on test
- Original Mitsubishi Electric packaging and documentation preserved where available
- Batch and date codes recorded for full supply chain transparency
- Counterfeit screening performed against known reference units — zero-tolerance policy
- Units shipped with ESD-protective packaging and shock-absorbing outer carton
Procurement Process
- Inquiry: Submit your requirement via [email protected] or WhatsApp +0086 19859288691 with quantity and delivery timeline
- Quotation: Receive a formal quotation within 1 business day including unit price, lead time, and shipping options
- Order Confirmation: Purchase order or online checkout accepted; proforma invoice issued for wire transfer orders
- Quality Inspection: Pre-shipment inspection report provided upon request (photos/video)
- Shipping: DHL / FedEx / UPS express available; sea freight for bulk orders; tracking number provided same day
- After-Sales: 12-month warranty against manufacturing defects; technical support available throughout product lifecycle
Technical FAQ
Q: Is the A1SCPU compatible with MELSEC-Q series base units?
A: No. The A1SCPU is designed exclusively for MELSEC-A slim series (AnS) base units. It is not physically or electrically compatible with Q-series or iQ-R series hardware.
Q: Can I use GX Works3 to program the A1SCPU?
A: No. GX Works3 does not support MELSEC-A series CPUs. Use GX Developer or GX Works2 in A-series compatibility mode.
Q: What memory cassette options are available to expand program capacity?
A: The A1SCPU supports memory cassettes such as the A3NMCA-8 (8K steps) and A3NMCA-16 (16K steps) for expanded program storage.
Q: How do I identify a genuine Mitsubishi A1SCPU vs. a counterfeit?
A: Verify the holographic Mitsubishi Electric label, check the serial number format against Mitsubishi’s official documentation, and inspect PCB quality. All units from Konmask.com are pre-screened for authenticity.
Q: What is the battery replacement interval?
A: Mitsubishi recommends replacing the lithium backup battery (A6BAT) every 5 years under normal operating conditions. Battery voltage can be monitored via the BAT LED indicator on the CPU front panel.
Q: Do you provide a test report before shipment?
A: Yes. Pre-shipment functional test reports including power-on verification are available upon request at no additional charge.
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