Mitsubishi FX1S-20MT-001 Programmable Logic Controller – Obsolete MELSEC FX1S Spare Part

Name: Mitsubishi FX1S-20MT-001 Programmable Logic Controller – Obsolete MELSEC FX1S Spare Part
Brand: Mitsubishi Electric

Model: FX1S-20MT-001

Brand Mitsubishi Electric

Series 20MT-001 Programmable Logic Controller

Model FX1S-20MT-001

RFQ-ready model route Obsolete and surplus sourcing Export follow-up by model list

Product Overview

Commercial availability is handled through direct RFQ, model verification and export-oriented follow-up rather than public cart checkout.

Submit RFQ Email This Model

Datasheet Preview

Use attached product manuals when available. If the manual is not public yet, request the full file directly through RFQ.

Request Full Manual

Commercial Path

Use This Page To Confirm The Model, Then Move To RFQ

Product pages on DRIVEKNMS are designed to verify model, brand and series first, then move the buyer into one clean quotation path.

Technical Dossier

Product Details And Specifications

Mitsubishi FX1S-20MT-001 Programmable Logic Controller – Obsolete MELSEC FX1S Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Parameter	Value
Part Number	FX1S-20MT-001
Brand	Mitsubishi Electric
Series	MELSEC FX1S
Product Type	Compact Programmable Logic Controller (PLC)
I/O Points	20 (12 Inputs / 8 Outputs)
Output Type	Transistor (Sink), NPN
Power Supply	24V DC
Program Memory	2,000 Steps
Communication Port	RS-422 (Peripheral port)
Country of Origin	Japan
Lifecycle Status	Discontinued / Obsolete – No longer in standard production
Compatible Systems	MELSEC FX1S series, FX-series peripheral devices, GX Developer, FX-PCS/WIN

Solving the Discontinued Hardware Crisis

The FX1S-20MT-001 was deployed extensively throughout the 1990s and 2000s in facilities across Asia, Europe, and the Americas. Its compact footprint, reliable transistor output, and straightforward ladder logic programming made it the default choice for machine builders working within tight panel space constraints. Many of those machines remain in daily production service today.

Mitsubishi Electric's end-of-life announcement for the FX1S series left a large installed base without a direct upgrade path that preserves existing programs and wiring. The FX5U series — Mitsubishi's current compact PLC platform — is not a drop-in replacement. It requires program conversion, different I/O wiring conventions, and in many cases a new HMI interface. For a plant running 20 or 30 FX1S-controlled machines, that migration is a multi-year project, not a maintenance task.

Condition & Reliability Assurance

Obsolete PLC units sourced from the secondary market carry specific failure risks that differ from new components. Our 5-step QA process addresses the failure modes most commonly observed in aged FX1S hardware:

Step 1 – Visual and Physical Inspection: Housing integrity check, connector pin condition, label verification against part number database.
Step 2 – Electrolytic Capacitor Assessment: Internal capacitors in FX1S units are a known aging point. Units showing capacitor bulge, leakage, or ESR deviation are rejected.
Step 3 – Firmware Version Verification: Firmware version is logged and disclosed. Compatibility with GX Developer and FX-PCS/WIN is confirmed.
Step 4 – Pin and Terminal Corrosion Check: All I/O terminals, power terminals, and the RS-422 peripheral port are inspected under magnification for oxidation or mechanical damage.
Step 5 – Functional Power-On Test: Unit is powered and basic I/O response is verified prior to packaging.

Units that do not pass all five steps are not offered for sale. Condition grade (New Surplus, Tested Refurbished) is disclosed on the invoice.

Key Features for System Maintenance

Drop-in replacement: The FX1S-20MT-001 installs directly into existing panel cutouts and wiring harnesses. No mechanical modification required.
No reprogramming required: Existing ladder logic programs transfer directly via the RS-422 peripheral port using GX Developer or FX-PCS/WIN. Program structure and I/O mapping are preserved.
No engineering redesign: Avoids the cost of control system re-engineering, I/O remapping, and HMI reconfiguration associated with platform migration.
Immediate deployment: Units are tested and ready for installation. No burn-in period or factory calibration required.
Long-term storage compatible: Units not immediately deployed should be stored in anti-static packaging at controlled temperature and humidity. Shelf life under proper storage conditions is measured in years.

Extending Automation Asset Life: A Maintenance Strategy for Plant Management

The economic case for maintaining legacy PLC infrastructure rather than forcing premature system replacement is well established in industrial maintenance practice. The FX1S-20MT-001 is a representative example of a component class where the cost of the part is negligible relative to the cost of the system it protects.

For facilities managing large FX1S installed bases, DriveKNMS can discuss volume availability and long-term supply agreements. Contact us directly to discuss your specific inventory requirements.

Q: How do I confirm the unit is genuine and not a counterfeit?
A: All units are sourced from traceable industrial channels. Part number, date codes, and firmware versions are documented. We do not source from unverified brokers. Inspection reports are available on request.

Q: Is the unit compatible with GX Developer software?
A: Yes. The FX1S-20MT-001 is fully compatible with GX Developer and FX-PCS/WIN via the RS-422 peripheral port. No additional hardware adapter is required for standard programming operations.

Continue The Model Path

Use system, brand and series routes to compare related published models.

Move from this exact model into the matching system hub, brand archive, model-family archive or lifecycle sourcing route before sending a final RFQ list.