{"product_id":"eaton-hmi04bu-operator-interface-input-unit-in-stock","title":"HMI04BU | Eaton Input Operator Interface","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp\u003eThe HMI04BU is part of Eaton’s HMi (PanelMate) series of compact operator interfaces—monochrome, analog touchscreen panels engineered for robust industrial control environments.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"height: 284.617px; width: 100%;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\" style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eCondition\u003c\/th\u003e\n\u003ctd class=\"text-left text-body1 py-10 desktop:w-[60%]\" style=\"width: 66.9772%; height: 19.6px;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\" style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eBrand\u003c\/th\u003e\n\u003ctd class=\"text-left text-body1 py-10 desktop:w-[60%]\" style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan data-sheets-root=\"1\"\u003eEaton \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eCategory\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\n\u003cdiv class=\"mt-1 md:mt-0 column-left basis-2\/4 divide-y divide-rad-gray-10 border-b-[0.0625rem] border-rad-gray-10 md:border-0\"\u003e\n\u003cdiv class=\"flex gap-[1.75rem] md:gap-x-0 xl:gap-x-[1.875rem]\"\u003e\n\u003cdiv class=\"text-body-4 w-full font-light py-5 pl-4 md:py-6 md:pl-6 text-rad-gray-70\"\u003e\n\u003cdiv class=\"max-w-[8rem] break-words\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eHMI \/ MMI \/ OIT\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 10px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 10px;\"\u003e\u003cspan\u003ePart Number\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 10px;\"\u003e\u003cspan data-sheets-root=\"1\"\u003eHMI04BU\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003e\u003cspan\u003eSubcategory\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan data-sheets-root=\"1\"\u003e\u003cspan\u003eOperator Interface\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; height: 19.6px; text-align: left;\" class=\"text-left text-body1 text-bold py-10 pr-10 desktop:pr-[10rem] desktop:text-nowrap\"\u003eSeries\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\" class=\"text-left text-body1 py-10 desktop:w-[60%]\"\u003e\n\u003cspan\u003eHMi (PanelMate)\u003c\/span\u003e\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eDisplay Type\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003eLCD Monochrome\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.8167px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.8167px;\"\u003eScreen Size\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.8167px;\" class=\"specification-value\"\u003e\n\u003cdiv class=\"module-table__value value-type-default\"\u003e\u003cspan class=\"specification-value-secondary\"\u003e\u003cspan\u003e3.8″\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eResolution\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003e320 × 240 pixels (QVGA)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003ePower Supply\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003e24 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eMounting Type\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003ePanel Mount\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eTouchscreen\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003eAnalog Resistive\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eCommunication Ports\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003eRS‑232, RS‑422, RS‑485\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eFunctionality\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003eHMI Display, Alarms, Recipes, Logging\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 32.8533%; text-align: left; height: 19.6px;\"\u003eWeight\u003c\/th\u003e\n\u003ctd style=\"width: 66.9772%; height: 19.6px;\"\u003e\u003cspan\u003e0.35 lbs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About HMI04BU\u003c\/h4\u003e\n\u003cp\u003eThe HMI04BU is part of Eaton’s HMi operator interface family—compact, touchscreen-based control panels designed for reliable monitoring and interaction in industrial automation systems. This 3.8″ monochrome unit supports 320×240 resolution and operates on 24 VDC, offering flexible serial communication through RS-232, RS-422, and RS-485 ports. Though discontinued, the HMI04BU remains widely used in legacy applications for its reliable functionality, intuitive configuration, and integration support with Eaton PLCs and third-party control systems.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e3.8″ Monochrome Touchscreen: Compact analog resistive display with 320×240 pixel resolution for clear visual feedback and control in tight panel spaces.\u003c\/li\u003e\n\u003cli\u003eMulti-Port Serial Communication: Supports RS-232, RS-422, and RS-485 protocols, ensuring compatibility with a wide range of PLCs and industrial devices.\u003c\/li\u003e\n\u003cli\u003eAdvanced Interface Functions: Built-in capabilities include alarm\/event logging, data trending, recipe management, password levels, macro execution, and USB support for printing and data transfer.\u003c\/li\u003e\n\u003cli\u003e24 VDC Power Input: Operates on a low-voltage DC supply (19.2–28.8 VDC), with natural air cooling for safe cabinet integration.\u003c\/li\u003e\n\u003cli\u003eLightweight and Compact: Weighs approximately 0.5 lb and fits into small enclosures—ideal for OEMs and compact control systems.\u003c\/li\u003e\n\u003cli\u003eDiscontinued but Supported: While no longer manufactured by Eaton, the HMI04BU remains available through industrial surplus suppliers and repair providers.\u003c\/li\u003e\n\u003cli\u003ePanel-Mount Design: Easily mounts into standard control cabinets and operator stations using panel cutouts, gaskets, and clips.\u003c\/li\u003e\n\u003cli\u003eLegacy System Integration: Widely used in Eaton and Cutler-Hammer-based control systems, particularly where cost-effective visualization and interaction are needed.\u003c\/li\u003e\n\u003cli\u003eDurable Performance: Known for its long service life and reliable operation in factory automation, packaging, and OEM equipment.\u003c\/li\u003e\n\u003cli\u003eGlobal Use in Legacy Equipment: Found in a wide range of older systems still in operation across industrial manufacturing and infrastructure sectors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Eaton HMI04BU operator interface delivers intuitive touchscreen control, flexible serial communication, and robust monitoring features in a compact footprint—making it a dependable solution for supporting legacy industrial automation systems and OEM platforms.\u003c\/p\u003e","brand":"Eaton","offers":[{"title":"Default Title","offer_id":50461305504042,"sku":"HMI04BU","price":1497.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/111973-001jpg_1024x1024_5dfc02d7-f459-4bda-a617-000f33bb1137.jpg?v=1754312593","url":"https:\/\/iqelectro.com\/products\/eaton-hmi04bu-operator-interface-input-unit-in-stock","provider":"IQElectro","version":"1.0","type":"link"}