{"product_id":"tm2alm3lt-schneider-electric-modicon-m238-analog-module","title":"TM2ALM3LT Schneider Electric Modicon M238 Analog Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eTM2ALM3LT\u003c\/span\u003e\u003c\/strong\u003e stands as a high-precision, low-level thermal processing module engineered for the \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eModicon M238 Logic Controller\u003c\/span\u003e\u003c\/strong\u003e platform. This dedicated mixed analog expansion block accommodates direct interface with thermocouples and 3-wire RTD sensors, executing signal conditioning and digital conversion over a high-resolution bus. Control engineers deploy the \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eTM2ALM3LT\u003c\/span\u003e\u003c\/strong\u003e to eliminate external transmitters while maintaining strict loop thermal stability in distributed instrumentation networks.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Schneider Electric\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eTM2ALM3LT\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Series:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eModicon M238 Platform\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e Low-Level Analog Input\/Output Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalogue Input Channels:\u003c\/strong\u003e 2 Differential Channels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermocouple Support:\u003c\/strong\u003e Type J (0 to 1200 °C), Type K (0 to 1300 °C), Type T (0 to 400 °C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Probe Support:\u003c\/strong\u003e 3-wire Pt100 probe (-100 to 500 °C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalogue Output Channels:\u003c\/strong\u003e 1 Configurable Channel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Ranges:\u003c\/strong\u003e Current (4 to 20 mA) or Voltage (0 to 10 V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 12 bits for both input and output conversions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLSB Values:\u003c\/strong\u003e 0.1 °C (Thermocouple), 0.15 °C (Pt Probe), 2.5 mV (Voltage), 4.8 µA (Current)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Error:\u003c\/strong\u003e +\/- 0.2% of Full Scale at 25 °C ambient\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-Linearity:\u003c\/strong\u003e +\/- 0.2% of Full Scale across all input\/output profiles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Drift Coefficient:\u003c\/strong\u003e +\/- 0.006% FS\/°C (Inputs), +\/- 0.015% FS\/°C (Outputs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Talk Isolation:\u003c\/strong\u003e Less than or equal to 2 LSB between adjacent channels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Impedance:\u003c\/strong\u003e Greater than or equal to 1 MOhm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Load Limitations:\u003c\/strong\u003e Less than or equal to 300 Ohm (Current mode), Greater than or equal to 2000 Ohm (Voltage mode)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply Requirements:\u003c\/strong\u003e 24 V DC external source (19.2 to 30 V operational limits)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Draw:\u003c\/strong\u003e 50 mA from external 24 V DC, 50 mA from internal 5 V DC bus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSnap the \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eTM2ALM3LT\u003c\/span\u003e\u003c\/strong\u003e directly onto standard 35 mm symmetrical DIN rails adjacent to the CPU block.\u003c\/li\u003e\n\u003cli\u003eUtilize the integrated interlocking side connectors to lock the module data path into the backplane bus.\u003c\/li\u003e\n\u003cli\u003eKeep sensor lines isolated from high-voltage motor starters, variable frequency drives, and heavy power mains.\u003c\/li\u003e\n\u003cli\u003eTerminate all field signals using dedicated shielded twisted-pair cabling to preserve low-level signal integrity.\u003c\/li\u003e\n\u003cli\u003eBond the cable shield securely to the functional ground bar near the controller layout enclosure.\u003c\/li\u003e\n\u003cli\u003eStrip and secure wires into the single removable screw terminal block using a calibrated precision screwdriver.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommissioning and Maintenance Convenience\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe hot-pluggable removable screw terminal block enables rapid unit replacement without disturbing existing panel infrastructure.\u003c\/li\u003e\n\u003cli\u003eDiagnostic software routines monitor internal conversion registers to verify hardware wellness instantly.\u003c\/li\u003e\n\u003cli\u003eUniform 20 ms stabilization time provides deterministic startup performance immediately upon system initialization.\u003c\/li\u003e\n\u003cli\u003eFront-facing labeling tracks channel alignment to help service technicians perform line checks during field verification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility and System Expansion\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDirect architectural bus alignment supports the \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eModicon M238 Logic Controller\u003c\/span\u003e\u003c\/strong\u003e base units.\u003c\/li\u003e\n\u003cli\u003eFully compatible with standard Advantys OTB distributed networking interfaces for remote I\/O configurations.\u003c\/li\u003e\n\u003cli\u003eIntegrates directly into legacy Twido automation architectures via existing backplane communication infrastructure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCertification and Standards\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCSA Certified\u003c\/li\u003e\n\u003cli\u003eUL Listed\u003c\/li\u003e\n\u003cli\u003eCE Marked\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eShipping and Warranty\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Lead Time:\u003c\/strong\u003e 24 to 48 hours dispatch guarantee\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCourier Partners:\u003c\/strong\u003e FedEx, UPS, and DHL express shipping services\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Period:\u003c\/strong\u003e 12-Month Comprehensive Warranty coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Application Scenarios\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlastic Extrusion Lines:\u003c\/strong\u003e Manages multi-zone barrel heating profiles by reading Type K thermocouples and adjusting output drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Drying Ovens:\u003c\/strong\u003e Monitors broad ambient heat profiles with Pt100 sensors to control modulating gas burner valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Chambers:\u003c\/strong\u003e Regulates strict low-temperature and high-humidity parameters via fast-response Type T thermocouple configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFood Pasteurization:\u003c\/strong\u003e Tracks precise temperature processing holds using high-resolution 3-wire differential measurement circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostics and Fault Isolation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePhotocoupler arrays provide 500 V galvanic isolation between I\/O channels and internal microprocessor logic.\u003c\/li\u003e\n\u003cli\u003eSystem registers flag broken wire anomalies, sensor burnout events, and out-of-range thermal values automatically.\u003c\/li\u003e\n\u003cli\u003eThe module detects power anomalies and drops outputs safely when the external 24 V DC falls below 19.2 V.\u003c\/li\u003e\n\u003cli\u003eConfiguration software reports cross-talk values exceeding 2 LSB to help engineers diagnose shielding degradation issues.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProcurement and Selection Guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSpecify the \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eTM2ALM3LT\u003c\/span\u003e\u003c\/strong\u003e when your application demands a compact, combined mix of analog thermal tracking and analog loop regulation.\u003c\/li\u003e\n\u003cli\u003eVerify your temperature sensors match the differential 3-wire Pt or specified J, K, or T thermocouple configurations.\u003c\/li\u003e\n\u003cli\u003eSelect alternative pure analog modules if your design requires standard 0-10V or 4-20mA instrumentation inputs.\u003c\/li\u003e\n\u003cli\u003eEnsure the total external 24 V DC distribution budget accommodates the 50 mA module consumption profile.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #008080;\"\u003eTM2ALM3LT\u003c\/span\u003e\u003c\/strong\u003e illustrates how space optimization benefits high-density control panels. Instead of splitting hardware spaces between dedicated RTD input modules, thermocouple blocks, and separate analog output controllers, this module handles all three functions within a slim 23.5 mm form factor.\u003c\/p\u003e\n\u003cp\u003eThe low temperature-drift coefficient of +\/- 0.006% FS\/°C makes this module highly reliable in harsh field environments that experience fluctuating control-room temperatures. It serves as an essential upgrade or maintenance component for legacy Modicon systems, delivering highly precise thermal feedback loops without requiring signal conditioners.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch3\u003eWhat specific precautions are necessary when mixing thermocouple types on the two available inputs?\u003c\/h3\u003e\n\u003cp\u003eThe module architecture requires configuring input channels through the software utility to match the connected sensor type. You can mix types J, K, or T between the two channels, but you must ensure correct software assignment to prevent major scaling errors.\u003c\/p\u003e\n\u003ch3\u003eWhy does the conversion time differ between temperature probes and thermocouple inputs on this module?\u003c\/h3\u003e\n\u003cp\u003eThe internal ADC uses different filtering and settling profiles depending on the signal level. Pt100 probes settle within 20 ms, while low-voltage thermocouple signals require up to 60 ms to ensure proper cold-junction compensation and noise suppression.\u003c\/p\u003e\n\u003ch3\u003eHow should the 3-wire Pt100 lead wire resistance be compensated to maintain accuracy?\u003c\/h3\u003e\n\u003cp\u003eThe differential circuit layout naturally compensates for balanced line resistance across the three wires. Ensure all three connection leads feature identical lengths, wire gauges, and material types to prevent impedance mismatches that cause thermal readout offsets.\u003c\/p\u003e\n\u003ch3\u003eCan I drive a current loop and a voltage loop simultaneously from the single analog output?\u003c\/h3\u003e\n\u003cp\u003eNo, the single analog output channel can only execute one mode at a time based on software configuration and physical terminal wiring. Attempting to draw current and voltage simultaneously will overload the circuit and cause output errors exceeding 1% FS.\u003c\/p\u003e\n\u003ch3\u003eWhat is the most effective way to eliminate ground loops when using ungrounded thermocouples with this unit?\u003c\/h3\u003e\n\u003cp\u003eUtilize high-grade shielded twisted-pair cables and ground the shield at only one single point, preferably at the panel enclosure side. The 500 V photocoupler isolation between channels protects the core logic, but single-point grounding ensures external noise does not distort the 12-bit conversion.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/TM2ALM3LT.png?v=1781682932\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Schneider Electric","offers":[{"title":"Default Title","offer_id":45190709739702,"sku":"TM2ALM3LT","price":106.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/TM2ALM3LT.jpg?v=1781682917","url":"https:\/\/www.plcsparehub.com\/products\/tm2alm3lt-schneider-electric-modicon-m238-analog-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}