{"product_id":"honeywell-2mlf-ac4h-4-channel-hart-analog-current-input-module","title":"Honeywell 2MLF-AC4H 4-Channel HART Analog Current Input Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell 2MLF-AC4H\u003c\/strong\u003e is a \u003cstrong\u003e4-channel HART analog current input module\u003c\/strong\u003e for the \u003cstrong\u003eMasterLogic-200 (ML200)\u003c\/strong\u003e PLC system. It supports \u003cstrong\u003e4–20 mA\u003c\/strong\u003e analog input with integrated \u003cstrong\u003eHART (Highway Addressable Remote Transducer) protocol\u003c\/strong\u003e communication, enabling bidirectional digital data exchange over the same 4–20 mA loop. This allows remote configuration, diagnostics, and multi-variable data retrieval from HART-enabled field instruments without additional wiring or communication modules.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e 4-Channel HART Analog Current Input Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e MasterLogic-200 \/ ML200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Type:\u003c\/strong\u003e Current (DC 4–20 mA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHART Protocol:\u003c\/strong\u003e HART 5, HART 6, HART 7 (configurable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 16-bit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversion Speed:\u003c\/strong\u003e 250 ms per channel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoop Power:\u003c\/strong\u003e 24V DC (internal or external)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Channel-to-channel isolation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Impedance:\u003c\/strong\u003e 250 Ω (current mode)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Block:\u003c\/strong\u003e 18-point removable terminal block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Consumption:\u003c\/strong\u003e 80 mA (from 5V internal bus)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Power:\u003c\/strong\u003e DC 24V (20.4–28.8V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W x H x D):\u003c\/strong\u003e 27.4 mm x 90 mm x 70 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approx. 120 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0°C to +55°C\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated HART communication\u003c\/strong\u003e — eliminates separate HART multiplexers and hand-held communicators, reducing hardware cost by 60% per loop\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel-to-channel isolation\u003c\/strong\u003e — galvanic isolation prevents ground loop errors when multiple HART devices share different ground potentials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16-bit resolution\u003c\/strong\u003e — 0.0015% measurement granularity enables precise process control for pressure, flow, and temperature loops\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-variable HART data\u003c\/strong\u003e — read primary variable, secondary variable, and device status from smart transmitters in a single scan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250 ms per channel\u003c\/strong\u003e — 1-second total scan for all 4 channels meets the requirements of most slow process loops (level, temperature)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSmart pressure transmitter integration in oil \u0026amp; gas pipelines\u003c\/li\u003e\n\u003cli\u003eCoriolis flow meter HART data acquisition in chemical batching\u003c\/li\u003e\n\u003cli\u003eMultivariable temperature transmitter monitoring in HVAC central plants\u003c\/li\u003e\n\u003cli\u003eValve positioner HART diagnostics in safety instrumented systems\u003c\/li\u003e\n\u003cli\u003eRemote device configuration without breaking the 4–20 mA loop\u003c\/li\u003e\n\u003cli\u003eAsset management system integration for predictive maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify HART device compatibility\u003c\/strong\u003e — confirm your field instruments support HART 5\/6\/7 and are configured for 4–20 mA + HART mode (not 4–20 mA only).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall in I\/O slot\u003c\/strong\u003e — mount the 2MLF-AC4H in any available ML200 I\/O slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect 24V external power\u003c\/strong\u003e — wire DC 24V to the external power terminals for loop power supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire 4–20 mA loops\u003c\/strong\u003e — connect each HART device to the corresponding channel terminals (AI+, AI-, EXC). Use 2-wire or 4-wire configuration as per device manual.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnable HART in SoftMaster\u003c\/strong\u003e — in the CPU I\/O parameters, set each channel to HART mode and configure the HART polling address.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify communication\u003c\/strong\u003e — use the SoftMaster HART diagnostic screen to read device tag, manufacturer, and primary variable from each connected instrument.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 2MLF-AC4H and 2MLF-AC4A?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e2MLF-AC4H\u003c\/strong\u003e includes \u003cstrong\u003eintegrated HART protocol\u003c\/strong\u003e communication. The \u003cstrong\u003e2MLF-AC4A\u003c\/strong\u003e is a standard 4–20 mA analog input without HART. Choose AC4H for smart HART instruments; choose AC4A for conventional 4–20 mA transmitters.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this module with non-HART 4–20 mA devices?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eYes.\u003c\/strong\u003e The 2MLF-AC4H is backward compatible with standard 4–20 mA devices. HART functionality is optional — if no HART device is connected, the channel operates as a standard analog input.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum loop resistance?\u003c\/strong\u003e\u003cbr\u003e\nA: The module supports loop resistances up to \u003cstrong\u003e600 Ω\u003c\/strong\u003e at 24V DC supply. For longer cable runs, use an external loop power supply or HART signal conditioner.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Does this module provide loop power?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eYes.\u003c\/strong\u003e The 2MLF-AC4H provides internal 24V DC loop power for each channel. Alternatively, you can use an external 24V supply for isolated loop power.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChoose \u003cstrong\u003e2MLF-AC4H\u003c\/strong\u003e when your field instruments are \u003cstrong\u003eHART-enabled smart transmitters\u003c\/strong\u003e (pressure, flow, temperature, level).\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003econventional 4–20 mA\u003c\/strong\u003e devices without HART, the \u003cstrong\u003e2MLF-AC4A\u003c\/strong\u003e is more cost-effective.\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003evoltage input\u003c\/strong\u003e (0–10V, 1–5V), select \u003cstrong\u003e2MLF-AV8A\u003c\/strong\u003e (8-channel voltage input).\u003c\/li\u003e\n\u003cli\u003eAlways verify your \u003cstrong\u003eHART device polling address\u003c\/strong\u003e — each device on the same loop must have a unique HART address (1–15 for multidrop mode).\u003c\/li\u003e\n\u003cli\u003eUse \u003cstrong\u003eshielded twisted-pair cable\u003c\/strong\u003e for HART loops to prevent electromagnetic interference from VFDs and contactors.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53953225064632,"sku":"2MLF-AC4H","price":178.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/2MLF-AC4H.png?v=1787197724","url":"https:\/\/www.globalpetroparts.com\/products\/honeywell-2mlf-ac4h-4-channel-hart-analog-current-input-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}