{"product_id":"honeywell-2mlf-rd4a-4-channel-rtd-input-module","title":"Honeywell 2MLF-RD4A 4-Channel RTD Input Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell 2MLF-RD4A\u003c\/strong\u003e is a \u003cstrong\u003e4-channel RTD (Resistance Temperature Detector) input module\u003c\/strong\u003e for the \u003cstrong\u003eMasterLogic-200 (ML200)\u003c\/strong\u003e PLC system. It directly interfaces with \u003cstrong\u003ePt100, Pt1000, Cu50, and Cu100\u003c\/strong\u003e RTD sensors, providing high-accuracy temperature measurement for process control, HVAC, and machine monitoring applications. With \u003cstrong\u003e16-bit resolution\u003c\/strong\u003e and built-in \u003cstrong\u003elead-wire compensation\u003c\/strong\u003e, it eliminates the need for external signal conditioners, reducing panel complexity and installation cost.\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 RTD 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\u003eSensor Types:\u003c\/strong\u003e Pt100, Pt1000, Cu50, Cu100 (3-wire or 4-wire)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Range:\u003c\/strong\u003e -200°C to +850°C (Pt100)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 16-bit (0.1°C typical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.1% FS at 25°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversion Speed:\u003c\/strong\u003e 80 ms \/ 4 channels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Channel-to-channel and channel-to-logic isolation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead-Wire Compensation:\u003c\/strong\u003e Automatic 3-wire and 4-wire compensation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Connection:\u003c\/strong\u003e 20-point removable terminal block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Consumption:\u003c\/strong\u003e 50 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. 100 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\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect RTD interface\u003c\/strong\u003e — eliminates external transmitters and signal conditioners, reducing panel component count by 60% per temperature loop\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic lead-wire compensation\u003c\/strong\u003e — 3-wire and 4-wire RTD support automatically nullifies cable resistance errors, ensuring ±0.1% accuracy even with long sensor cables\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide -200°C to +850°C range\u003c\/strong\u003e — covers cryogenic, ambient, and high-temperature process applications with a single module type\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16-bit resolution\u003c\/strong\u003e — 0.1°C measurement granularity enables precise temperature control for pharmaceutical and food-grade batch processes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel isolation\u003c\/strong\u003e — prevents ground loop errors when multiple RTDs are installed on different grounded vessels or pipes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReactor jacket temperature monitoring in chemical plants\u003c\/li\u003e\n\u003cli\u003eBoiler steam temperature measurement in power generation\u003c\/li\u003e\n\u003cli\u003eHVAC chilled water and hot water supply temperature\u003c\/li\u003e\n\u003cli\u003eFood \u0026amp; beverage pasteurization and CIP temperature verification\u003c\/li\u003e\n\u003cli\u003ePharmaceutical autoclave and freeze-dryer temperature control\u003c\/li\u003e\n\u003cli\u003eMotor bearing and gearbox oil temperature monitoring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify RTD type\u003c\/strong\u003e — confirm your sensors are Pt100, Pt1000, Cu50, or Cu100 and wired as 3-wire or 4-wire configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall in I\/O slot\u003c\/strong\u003e — mount the 2MLF-RD4A 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 the excitation circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire RTD sensors\u003c\/strong\u003e — connect sensor leads to the appropriate terminals:\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-wire:\u003c\/strong\u003e Connect one lead to AI+, one to AI-, and the compensation lead to the EXC terminal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-wire:\u003c\/strong\u003e Connect two leads to AI+ and AI- (current injection), and two leads to S+ and S- (sense).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfigure sensor type in SoftMaster\u003c\/strong\u003e — select Pt100, Pt1000, Cu50, or Cu100 and the wiring method (3-wire or 4-wire) in the CPU I\/O parameters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify temperature reading\u003c\/strong\u003e — compare the PLC reading against a calibrated handheld thermometer at a known temperature point (e.g., ice bath at 0°C).\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 2MLF-RD4A and 2MLF-RD8A?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e2MLF-RD4A\u003c\/strong\u003e provides \u003cstrong\u003e4 RTD channels\u003c\/strong\u003e. The \u003cstrong\u003e2MLF-RD8A\u003c\/strong\u003e provides \u003cstrong\u003e8 RTD channels\u003c\/strong\u003e in the same footprint. Choose RD8A for high-density temperature monitoring; choose RD4A when 4 channels are sufficient and lower cost is preferred.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use thermocouples with this module?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eNo.\u003c\/strong\u003e The 2MLF-RD4A is for RTD sensors only. For thermocouples (J, K, T, E, R, S, B types), use the \u003cstrong\u003e2MLF-TC4S\u003c\/strong\u003e (4-channel isolated thermocouple input) module.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum cable length from sensor to module?\u003c\/strong\u003e\u003cbr\u003e\nA: With \u003cstrong\u003e3-wire or 4-wire compensation\u003c\/strong\u003e, cable runs up to \u003cstrong\u003e500 meters\u003c\/strong\u003e are possible using 1.0 mm² or larger copper cable, depending on environmental noise.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this module provide sensor excitation?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eYes.\u003c\/strong\u003e The 2MLF-RD4A provides constant current excitation to the RTD. No external excitation source is required.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChoose \u003cstrong\u003e2MLF-RD4A\u003c\/strong\u003e for \u003cstrong\u003e4-channel RTD temperature measurement\u003c\/strong\u003e in standard process applications.\u003c\/li\u003e\n\u003cli\u003eIf you need \u003cstrong\u003e8 channels\u003c\/strong\u003e in the same slot, upgrade to \u003cstrong\u003e2MLF-RD8A\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003ethermocouple applications\u003c\/strong\u003e (high temperature \u0026gt;850°C), select \u003cstrong\u003e2MLF-TC4S\u003c\/strong\u003e instead.\u003c\/li\u003e\n\u003cli\u003eAlways use \u003cstrong\u003eshielded, twisted-pair cable\u003c\/strong\u003e for RTD wiring to minimize electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eVerify your \u003cstrong\u003eRTD wiring configuration\u003c\/strong\u003e (3-wire vs. 4-wire) before ordering cable — 4-wire provides the highest accuracy but requires more conductors.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53952936083640,"sku":"2MLF-RD4A","price":167.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/2MLF-RD4A.png?v=1787197701","url":"https:\/\/www.globalpetroparts.com\/products\/honeywell-2mlf-rd4a-4-channel-rtd-input-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}