{"product_id":"allen-bradley-1746-nr8-slc-500-rtd-and-resistance-input-module-8-channel","title":"Allen-Bradley 1746-NR8 SLC 500 RTD and Resistance Input Module | 8-Channel","description":"\u003ch3\u003e\u003cstrong\u003eModule Functional Capability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1746-NR8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Catalog Number:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1746-NR8\u003c\/strong\u003e) is a high-density analog input module designed for the SLC 500 platform, providing eight independent channels for temperature sensing and precision resistance measurement. By utilizing Sigma-Delta modulation for A\/D conversion, the module ensures high noise immunity and exceptional accuracy for critical thermal monitoring. It is engineered to interface directly with a variety of Resistance Temperature Detectors (RTDs) and direct resistance sources, converting low-level signals into digital temperature data accessible by the SLC processor.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1746-NR8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efeatures extensive sensor compatibility and robust backplane performance for industrial environments.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Capacity\u003c\/strong\u003e: 8 Channels (Differential)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConversion Technology\u003c\/strong\u003e: Sigma-Delta Modulation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTemperature Resolution\u003c\/strong\u003e: 0.01°C\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Power Consumption\u003c\/strong\u003e: 1.82W maximum (comprising 100 mA @ 5V DC and 55 mA @ 24V DC)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUpdate Interval\u003c\/strong\u003e: Variable from 6 milliseconds to 2 seconds depending on channel configuration and filter selection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStep Response\u003c\/strong\u003e: 60 milliseconds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Range\u003c\/strong\u003e: 0°C to 60°C (32°F to 140°F) Operating; -40°C to 85°C Storage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eChassis Slot Compatibility\u003c\/strong\u003e: Any slot in a 1746 chassis except the CPU slot (Slot 0)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Weight\u003c\/strong\u003e: 0.34 kg (0.75 lbs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSupported Sensor Types and Ranges\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis module is compatible with a wide array of RTD types (Platinum, Nickel, Copper, and Nickel-Iron) and linear resistance inputs:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePlatinum (Alpha = 0.00385\/0.003916)\u003c\/strong\u003e: 100, 200, 500, and 1000 Ohm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNickel (Alpha = 0.00618\/0.00672)\u003c\/strong\u003e: 120 Ohm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCopper (Alpha = 0.00426)\u003c\/strong\u003e: 10 Ohm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNickel-Iron (Alpha = 0.00518)\u003c\/strong\u003e: 604 Ohm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDirect Resistance Ranges\u003c\/strong\u003e: 0–150 Ω, 0–300 Ω, 0–500 Ω, and 0–1000 Ω\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Integration FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1747-NR8 require external power?\u003c\/strong\u003eThe module is powered entirely through the SLC 500 backplane. However, the user must ensure the power supply (e.g., 1746-P1, P2, etc.) has sufficient current capacity for the module’s 5V and 24V requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module handle lead wire compensation?\u003c\/strong\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1746-NR8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esupports 2-wire, 3-wire, or 4-wire RTD configurations. For maximum precision in applications with long cable runs, a 3-wire or 4-wire setup is recommended to automatically compensate for lead wire resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I mix RTD types and resistance inputs on the same module?\u003c\/strong\u003eYes, each of the eight channels can be individually configured for a specific sensor type or resistance range via the processor's output image table.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":52887500292280,"sku":"1746-NR8","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1746-NR8.jpg?v=1772094705","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1746-nr8-slc-500-rtd-and-resistance-input-module-8-channel","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}