Description
MITSUBISHI A1SJ51T64 – 64‑point transistor output module for MELSEC‑A control panels
The MITSUBISHI A1SJ51T64 is a 64‑point DC transistor output module designed for MELSEC‑A series PLC racks. From my experience, it’s a practical pick when you need high channel density in a compact slot, especially on legacy or mixed-technology lines where every rack position counts. You might notice that it drops into an existing A1S base unit without reworking the CPU or backplane, which typically shortens downtime during upgrades or swaps.
Our Order Placement Process & Guarantees
- Warranty period: 365 days
- Delivery time: 1 week for in‑stock items; no more than one month at the latest
- Payment: 50% advance payment, full payment before delivery
- Express delivery: FedEx, UPS, DHL
Key Features
- 64-point DC transistor outputs – Suited for high-density discrete control; ideal for solenoids, indicator stacks, or interlocks in larger panels.
- MELSEC‑A rack compatibility – Installs directly on A-series base units, using the backplane bus for power and control.
- Fast switching – Transistor output stages provide quick on/off response for machine sequencing and light-duty actuators.
- External 24 VDC load supply – Keeps field power separate from PLC logic, which in many cases improves noise immunity and serviceability.
- Group‑based commons – Channels are typically grouped to simplify fusing and field wiring; helps when isolating sections during maintenance.
- Service-friendly wiring – Uses standard A-series wiring interfaces, so existing terminal blocks and harnesses can often be reused.
Technical Specifications
| Brand / Model | MITSUBISHI A1SJ51T64 (MELSEC‑A Series) |
| HS Code | 853710 (Programmable controllers and related I/O, ≤1000 V) |
| Power Requirements | 5 VDC supplied from A-series backplane (logic); external 24 VDC supply for output loads |
| Signal Output Type | 64-point transistor outputs, 24 VDC nominal (grouped commons; suitable for light-duty DC loads) |
| Communication Interfaces | Backplane bus only (no front communication ports) |
| Installation Method | Mounts on MELSEC‑A base unit (panel-mounted rack); field wiring via standard A-series wiring interfaces/terminal bases |
| Operating Temperature | 0 to 55°C (typical for A-series I/O modules) |
| Dimensions & Weight | A-series single‑slot form factor; approx. 130(H) × 35(W) × 98(D) mm, ~0.3 kg (typical) |
Application Fields
This module fits well in packaging lines, automotive sub‑assemblies, machine tools, and water/wastewater skids that rely on many discrete DC signals. One thing I appreciate is how it supports dense indicator arrays, interlocks, and small solenoid valves without consuming multiple slots. A maintenance lead at a bottling plant told us the swap from a 32‑point card to the A1SJ51T64 “freed a slot and shaved an hour off weekend changeovers” because all outputs were on one card.
Advantages & Value
- Reliability – Proven A-series ecosystem; in most cases runs for years with minimal drift or nuisance faults.
- Compatibility – Works with MELSEC‑A CPUs and base racks, so spares strategies remain simple.
- Panel density – 64 channels per slot reduces rack footprint and often wiring labor.
- Cost control – Extends the life of installed A-series assets; avoids an immediate migration to a new PLC platform.
- Support – We can assist with part identification, wiring options, and form‑fit replacement checks before shipment.
Installation & Maintenance
- Cabinet & rack – Install on an approved A-series base unit in a clean, ventilated enclosure. Keep ambient 0–55°C, non‑condensing humidity.
- Power & wiring – Separate 24 VDC output power from PLC logic 5 VDC. Use appropriately rated fuses or breakers per output group. Follow polarity and load current limits for each channel.
- EMC practices – Route DC output wiring away from VFD motor leads; bond panel ground properly to reduce switching noise.
- Routine checks – Periodically verify terminal tightness, remove dust, and confirm channel status LEDs. Firmware updates apply to CPUs; I/O modules like this typically do not require updates.
- Spare strategy – Keeping one spare per panel section is usually enough; the high channel count reduces the number of unique cards to stock.
Quality & Certifications
- CE and UL/cUL conformity for industrial control equipment (typical for MELSEC‑A I/O)
- RoHS compliance on later production runs (verify label if required by site standards)
- Manufacturer’s standard quality controls plus a 365‑day warranty from us
If you’re consolidating outputs or planning a form‑fit replacement on an A‑series rack, the A1SJ51T64 seems to be one of the safer paths. Share your rack type and load details (voltage, per‑point current) and we’ll double‑check grouping and wiring accessories before shipping.
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