Description
MITSUBISHI A1S65B-S1 – 5‑Slot Base Unit for MELSEC‑A PLC Systems
The MITSUBISHI A1S65B-S1 is a compact 5-slot base unit designed for MELSEC‑A series PLCs. In many cases, it’s chosen for machine upgrades or compact new builds where you need a stable backplane that accepts a mix of CPU, power supply, digital/analog I/O, and special function modules. One thing I appreciate is how straightforward it is to assemble and maintain—typically you can scale from a small controller to a mid-size system just by populating the slots you need.
The “-S1” suffix is a Mitsubishi revision designation; functionally, it’s the familiar 5-slot A-series base with improved production revision. If you’re standardizing on legacy A-series assets or maintaining installed machines, this model keeps your control cabinet tidy and reliable without pushing you into a full platform migration before you’re ready.
Our Order Placement Process and Guarantees
- Warranty: 365 days from delivery.
- Lead time: 1 week if in stock; no more than one month at the latest.
- Payment: 50% advance payment; full payment prior to delivery.
- Express options: FedEx, UPS, DHL.
Key Features
- 5-slot backplane – Enough capacity for compact cells or mid-size machines while keeping wiring short and neat.
- MELSEC‑A bus compatibility – Works with A-series CPUs, power supplies, and I/O/special modules many plants already stock.
- Flexible power options – Use the appropriate PSU module (e.g., AC or 24 VDC) to match site standards; the backplane itself doesn’t require a direct power feed.
- Mixed I/O support – Supports digital, analog, motion, positioning, and communication modules on the same rack.
- Panel-friendly form factor – Typically mounts cleanly inside standard industrial cabinets; service access is straightforward.
- Stable supply for maintenance teams – A sensible choice when you need to keep legacy machines running reliably without reengineering.
Technical Specifications
| Brand / Model | MITSUBISHI A1S65B-S1 (MELSEC‑A series 5-slot base unit) |
| HS Code | 8538.90 (Parts suitable for apparatus of 8537 – PLC control equipment) |
| Power Requirements | Via PSU module; the backplane has no direct power input. Typical options include AC 100–240 V (e.g., A1S61PN) or 24 VDC (e.g., A1S62PN). |
| Slots / Backplane | 5 module slots on the MELSEC‑A parallel bus; supports CPU, I/O, and special function modules per system design. |
| Dimensions & Weight | Approx. 247 W × 130 H × 98 D mm; approx. 1.2 kg (typical for 5-slot A-series bases). |
| Operating Temperature | 0 to 55 °C (typical for Mitsubishi A-series control gear) |
| Signal I/O Types | Depends on installed modules: DI/DO (DC/relay/triac), AI/AO, high-speed counters, motion/positioning. |
| Communication Interfaces | Via modules (e.g., RS‑232C, RS‑422/485, Ethernet, CC‑Link, etc.). |
| Installation Method | Panel mounting inside an industrial control cabinet; DIN-rail mounting may be possible with the appropriate adaptor. |
Application Fields
From my experience, A-series bases like the A1S65B-S1 are common in brownfield sites and OEM machines where reliability and parts availability matter. You’ll typically see them in:
- Packaging and converting lines – compact racks close to the process for clean wiring.
- Automotive and general assembly – stable I/O backbone for jigs, fixtures, and transfer systems.
- Food & beverage – modular add-ons for dosing, filling, and labeling skids.
- Water/wastewater and utilities – retrofit panels where legacy interoperability is crucial.
- Semiconductor and electronics equipment – mixed analog/digital I/O with specialized positioning modules.
A maintenance lead recently told us: “Swapping the base kept our line control intact; we reused the existing modules and were back up after a short shutdown.”
Advantages & Value
- Reliability – Proven MELSEC‑A backplane; stable under typical industrial noise and temperature ranges.
- Compatibility – Works with a wide range of existing A-series CPUs and modules, reducing engineering time.
- Cost control – Extend the life of current assets; avoid an immediate platform migration cost.
- Availability and support – Spares and documentation are widely circulated; we can help match modules and PSUs for your exact build.
Installation & Maintenance
- Environment – Mount in a clean, dry cabinet with adequate ventilation. Keep heat sources away and allow clearance for module insertion/removal.
- Wiring – Separate high-voltage power from signal lines; ensure proper grounding to reduce electrical noise. Use the specified PSU module and check backplane connectors are fully seated.
- Safety – De-energize before maintenance; verify lockout/tagout where applicable. Handle modules with ESD protection.
- Routine care – Periodically inspect and clean dust from the backplane area; re-seat modules if vibrations are present. Firmware updates apply to CPU/communication modules, not the base, but it’s good practice to keep the system’s components aligned.
Quality & Certifications
- CE compliant (industrial EMC and safety, as applicable to A-series components)
- UL/cUL recognized (typical for Mitsubishi PLC hardware)
- RoHS compliant
- Manufacturer’s warranty practices apply; our supply warranty is 12 months (365 days).
Compatible/Supporting Components (Examples)
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- Power supplies: A1S61PN (AC 100–240 V), A1S62PN (24 VDC)
- CPUs: A1SJCPU, A2SHCPU (select based on memory, I/O count, and scan needs)
- Digital I/O: A1SX series (inputs), A1SY series (outputs)
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