{"product_id":"triconex-3721-analog-input-module-tmr-0-5-vdc","title":"Triconex 3721 Analog Input Module TMR 0-5 VDC","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3721 (3721)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-density, Triple Modular Redundancy (TMR)\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAnalog Input Module\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eengineered for the Triconex safety system to ensure maximum process uptime and safety integrity. Featuring\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e32 differential, DC-coupled input points\u003c\/strong\u003e, this module is specifically designed to interface with critical sensors in demanding environments such as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eoil and gas refineries, chemical processing plants, and power generation facilities\u003c\/strong\u003e. By utilizing a triplicated architecture, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3721\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eindependently processes each input signal across three channels, performing hardware-based voting to eliminate single points of failure. Its rapid\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e10 ms update rate\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand programmable resolution make it indispensable for high-speed safety instrumented functions (SIF) where precise monitoring of pressure, flow, or temperature is vital to preventing catastrophic system failures.\u003c\/p\u003e\n\u003ch3\u003eSystem Architecture \u0026amp; Signal Processing\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3721\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emodule employs a sophisticated triplicated hardware design to maintain signal gold-standard accuracy even in electrically noisy industrial settings.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTriplicated Input Path:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEach of the 32 differential inputs is isolated and routed to three independent primary communication paths. This ensures that a failure in one sensing circuit does not compromise the overall safety loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Resolution Accuracy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module supports\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e12-bit or 14-bit programmable resolution\u003c\/strong\u003e, allowing engineers to balance data granularity with processing speed. With an accuracy of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eless than 0.15% of FSR\u003c\/strong\u003e, it provides reliable data for tight control limits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Signal Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTo defend against field wiring errors and surges, the module features\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eInput Overrange Protection up to 150 VDC or 115 VAC continuous\u003c\/strong\u003e, significantly reducing the risk of board-level damage during electrical faults.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTriconex 3721 Analog Input Module – Technical Specifications\u003c\/h3\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\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e3721\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTriconex (Schneider Electric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eAnalog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor Code\u003c\/td\u003e\n\u003ctd\u003eYellow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Input Signals\u003c\/td\u003e\n\u003ctd\u003e32 differential, DC-coupled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e0 to 5 VDC or -5 to +5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current Range\u003c\/td\u003e\n\u003ctd\u003e0 to 20 mA with 250 Ω shunt resistor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e12 bits or 14 bits programmable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Update Rate\u003c\/td\u003e\n\u003ctd\u003e10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.15% of FSR from 32° to 140° F (0° to 60° C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance (Load)\u003c\/td\u003e\n\u003ctd\u003e10 MΩ (DC), minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance at Power Off\u003c\/td\u003e\n\u003ctd\u003e140 kΩ (DC), typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Mode Rejection (typical)\u003c\/td\u003e\n\u003ctd\u003e-85 dB (DC – 100 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Mode Voltage Range\u003c\/td\u003e\n\u003ctd\u003e-12V to +12V peak\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel-to-Channel Isolation\u003c\/td\u003e\n\u003ctd\u003e420 kΩ, typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNormal Mode Rejection\u003c\/td\u003e\n\u003ctd\u003e-3 dB @ 23 Hz; -8 dB @ 60 Hz; -14 dB @ 120 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Over-range Measurement\u003c\/td\u003e\n\u003ctd\u003e+6%, -5.3 to +5.3 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Over-range Protection\u003c\/td\u003e\n\u003ctd\u003e150 VDC continuous, 115 VAC continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLogic Power\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 12 watts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField to System Isolation\u003c\/td\u003e\n\u003ctd\u003e800 VDC minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Status Indicators\u003c\/td\u003e\n\u003ctd\u003ePass, Fault, Active, Field\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Diagnostic Fault Coverage\u003c\/td\u003e\n\u003ctd\u003eMinimum input change: 2% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Change Sample Period\u003c\/td\u003e\n\u003ctd\u003e20 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Period of Mis-compares\u003c\/td\u003e\n\u003ctd\u003e25 samples\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eTricon v10.2 and later systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e1.36 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e4.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical Maintenance \u0026amp; FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I switch between 12-bit and 14-bit resolution on the 3721?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe resolution is software-programmable via the TriStation 1131 configuration environment. Changing this setting allows you to optimize the module for specific sensor requirements without needing to modify physical hardware or jumpers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if a field signal exceeds 5 VDC?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3721\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eincludes robust protection circuitry. It can withstand continuous exposure up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e150 VDC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewithout sustaining permanent hardware damage, though the signal will be flagged as \"Overrange\" in the system diagnostics until it returns to the normal operating window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 3721 compatible with 4-20 mA signals?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDirectly, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3721\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a voltage-input module (0-5 VDC). To monitor 4-20 mA loops, you must use an external precision shunt resistor (typically 250 ohms) at the terminal assembly to convert the current signal into a 1-5 VDC signal compatible with the module.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Engineering \u0026amp; Installation Strategy\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDifferential Wiring Best Practices:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFor the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e32 differential points\u003c\/strong\u003e, always use high-quality shielded twisted-pair (STP) cabling. Ensure the shield is grounded only at one end (typically the chassis side) to prevent ground loops that could degrade the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e-85 dB Common Mode Rejection\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Management:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhile the module is rated for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 to 60 deg C\u003c\/strong\u003e, high-density configurations (32 points active) generate internal heat. Ensure the Tricon chassis fans are clean and provide unobstructed vertical airflow to maintain the specified\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0.15% accuracy\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eover the long term.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTerminal Assembly Torque:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen securing field wires to the associated External Termination Assembly (ETA), apply a torque of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0.5 to 0.6 Nm\u003c\/strong\u003e. Under-tightening can cause signal drift or \"Open Input\" alarms due to vibration in heavy industrial environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIndustrial Advantages \u0026amp; Resilience\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTriconex 3721\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estands out for its superior electrical isolation and fault tolerance. Its non-commoned, differential input structure provides exceptional immunity to electromagnetic interference (EMI), which is critical when sensors are located near large motors or variable speed drives. The module supports\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eHot-Swap\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ereplacement, allowing maintenance teams to replace a faulty unit while the controller remains online, thereby maintaining the \"Always Available\" status of the safety system. With its USA-based manufacturing standards and rigorous environmental testing, the 3721 ensures a multi-decade service life in the harshest global industrial applications.\u003c\/p\u003e","brand":"Triconex","offers":[{"title":"Default Title","offer_id":53102421410155,"sku":"3721","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/3721-vucnsftcqq5.png?v=1776137114","url":"https:\/\/www.plcprotech.com\/products\/triconex-3721-analog-input-module-tmr-0-5-vdc","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}