{"product_id":"honeywell-2mli-d28a-64-point-digital-input-module","title":"Honeywell 2MLI-D28A 64-Point Digital Input Module","description":"\u003ch2\u003eHoneywell 2MLI‑D28A 64‑Point Digital Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for high‑density 24 VDC discrete acquisition in MasterLogic platforms, the \u003cstrong\u003eHoneywell 2MLI‑D28A\u003c\/strong\u003e (\u003cstrong\u003e2MLI‑D28A\u003c\/strong\u003e digital input module) provides direct electrical execution of 64 sinking‑type input points with CPU‑configurable response timing and photo‑coupler isolation.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e2MLI‑D28A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.15 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003e60 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eDigital Input Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eMasterLogic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Input Points\u003c\/th\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIsolation Method\u003c\/th\u003e\n\u003ctd\u003ePhoto‑coupler isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Input Voltage\u003c\/th\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Input Current\u003c\/th\u003e\n\u003ctd\u003e~4 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Voltage Range\u003c\/th\u003e\n\u003ctd\u003e20.4–28.8 VDC (ripple \u0026lt; 5%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInput Resistance\u003c\/th\u003e\n\u003ctd\u003e~5.6 kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eON Threshold\u003c\/th\u003e\n\u003ctd\u003e≥19 V \/ ≥3 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOFF Threshold\u003c\/th\u003e\n\u003ctd\u003e≤11 V \/ ≤1.7 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eResponse Time\u003c\/th\u003e\n\u003ctd\u003e1\/3\/5\/10\/20\/70\/100 ms (CPU‑set), default 3 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIsolation Voltage\u003c\/th\u003e\n\u003ctd\u003eAC 560 V rms (3 cycles @ 2000 m altitude)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIsolation Resistance\u003c\/th\u003e\n\u003ctd\u003e≥10 MΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCommon Method\u003c\/th\u003e\n\u003ctd\u003e32‑point per COM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCable Size\u003c\/th\u003e\n\u003ctd\u003e0.3 mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIndicators\u003c\/th\u003e\n\u003ctd\u003e32‑point LED bank (switch‑selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExternal Connection\u003c\/th\u003e\n\u003ctd\u003eTwo 40‑point connectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4‑20 mA HART Loop Protocol Interaction \u0026amp; Channel‑to‑Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eAlthough the 2MLI‑D28A is a discrete module, its photo‑coupler isolation and threshold design align with Honeywell’s mixed‑signal backplane behavior. Channel‑to‑channel isolation prevents transient coupling from adjacent analogue modules handling 4‑20 mA HART loops. The module’s fixed impedance (~5.6 kΩ) ensures predictable loading when installed near loop‑powered transmitters, while the AC 560 V isolation rating maintains stable reference behavior across grounding planes. CPU‑selectable response times allow tuning for noise‑sensitive environments where HART loop polling may introduce switching artifacts.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 2MLI‑D28A be hot‑swapped? A: No. The module must be inserted or removed only when the MasterLogic rack is de‑energized.\u003c\/p\u003e\n\u003cp\u003eQ: Does changing the CPU response‑time parameter affect backplane timing? A: No. Response‑time selection affects only input filtering; backplane scan timing is controlled by the CPU.\u003c\/p\u003e\n\u003cp\u003eQ: Are the 64 points individually isolated? A: Isolation is provided per channel through photo‑couplers, but commons are grouped in 32‑point COM blocks.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoute 24 VDC discrete wiring separately from analogue or high‑energy conductors to reduce noise coupling.\u003c\/li\u003e\n\u003cli\u003eMaintain correct polarity for sinking‑type field devices.\u003c\/li\u003e\n\u003cli\u003eUse 0.3 mm² conductors as recommended to ensure proper terminal engagement.\u003c\/li\u003e\n\u003cli\u003eEnsure connectors are fully seated to avoid intermittent channel behavior.\u003c\/li\u003e\n\u003cli\u003eTerminate shields at a single grounding point to prevent ground‑loop interference.\u003c\/li\u003e\n\u003cli\u003eVerify CPU response‑time settings when integrating with fast‑acting sensors or interlocks.\u003c\/li\u003e\n\u003cli\u003eLabel all field wiring to support maintenance and troubleshooting.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48225877000382,"sku":"2MLI-D28A","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-07-02_09-59-56_8b7fd3b8-5e17-4bae-bff7-ab310e3010e5.png?v=1782960726","url":"https:\/\/www.autooiltech.com\/products\/honeywell-2mli-d28a-64-point-digital-input-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}