{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FX3U-80MT/DSS","brand":"Mitsubishi Electric","brandSlug":"mitsubishi","productSlug":"FX3U-80MT-DSS","canonicalUrl":"https://aoctrl.com/mitsubishi/FX3U-80MT-DSS","factsUrl":"https://aoctrl.com/api/mcp/products/FX3U-80MT%2FDSS","rawCanonicalId":null},"summary":{"shortDescription":"Mitsubishi MELSEC-F FX3U base unit, 80 I/O points, DC 24 V supply, 40 transistor source outputs, 40 DC inputs, 64K-step RAM program memory, RS-422, USB optional.","salesMarkdown":"The Mitsubishi FX3U-80MT/DSS is a MELSEC-F-series main unit with 40 digital inputs at DC 24 V and 40 transistor source outputs, all integrated on a single base. The unit is rated for 256 local I/O points per the specification, expandable to 384 points with remote I/O. Program memory is 64K steps of RAM, backed by a buffer battery to retain the program during power loss. ## Comparison with FX5U-80MT/ESS A buyer evaluating the FX5U-80MT/ESS as a functional second source should note the primary circuit difference: the FX5U operates on 100 to 240 V AC, whereas the FX3U-80MT/DSS requires a dedicated 24 V DC supply. The output configuration also diverges — the FX3U is transistor/source, the FX5U is transistor/source but with AC power. A direct drop-in replacement without rewiring the power supply and verifying I/O compatibility is not supported by the specification. For a BOM line specified around the FX5U, a full panel power redesign would be needed. ## Hardware Integration The unit consumes 45 W at full load and is rated for an ambient temperature range of 0 to 55°C with an IP10 protection class, suitable for panel-mount applications without washdown exposure. RS-422 is provided as standard; USB is listed as an option and must be verified on the specific unit if required. The buffer battery ensures program retention during extended power-off intervals, though the RAM-based memory should be backed up externally for critical systems.","metaTitle":"Mitsubishi FX3U-80MT/DSS PLC, 80 I/O DC Transistor Source, 6","metaDescription":"Mitsubishi MELSEC-F FX3U-80MT/DSS main unit with 40 DC inputs, 40 transistor source outputs, 256 local I/O points expandable to 384. 64K-step RAM, RS-422, USB optional. Mature life","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"USB":"OPTION","Type":"FX3U","title":"FX3U-80MT/DSS","RS-422":"1","Series":"MELSEC-F SERIES","Weight":"1,2 kg","Expandable":"YES","Output Type":"TRANSISTOR","description":"MAIN UNIT","Current Type":"DC","Output Logic":"SOURCE","Buffer Battery":"YES","Program Memory":"64K STEPS","Shipping Weight":"2 Kg","lifecycle_stage":"mature","Local I/O Points":"256","Power Supply (V)":"24","Protection Class":"IP10","Cycle Time LD (ns)":"65","Cycle Time MOV (ns)":"642","Estimated Lead Time":"1 - 10 Working Days","Program Memory Unit":"RAM","Power Consumption (W)":"45","Integrated Digital Inputs":"40","Local + Remote I/O Points":"384","Integrated Digital Outputs":"40","PLC, FX3U Base Unit DC 24 V":"40 inputs DC 24 V; 40 transistor outputs","Max. Ambient Temperature (°C)":"55","Min. Ambient Temperature (°C)":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$357.00 – $949.96","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/58addcc0a2a70e9a5b25b7f1ff3c3091.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can the FX5U-80MT/ESS be used as a direct replacement for the FX3U-80MT/DSS?","answer":"No, because the FX5U requires 100 to 240 V AC power while the FX3U operates on 24 V DC. The output types are both transistor source, but the power supply difference prevents a drop-in swap without panel rewiring."},{"question":"What is the USB capability of the FX3U-80MT/DSS?","answer":"USB is listed as an option on this unit. The base specification does not confirm whether it is fitted; verify the specific unit or order variant if USB is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/mitsubishi/FX3U-80MT-DSS","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/mitsubishi/FX3U-80MT-DSS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}