{"product_id":"allen-bradley-1746-nr8-rtd-module-input-slc-500","title":"Allen-Bradley 1746-NR8 RTD Module Input SLC 500","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong style=\"color: #003366;\"\u003eAllen-Bradley 1746-NR8\u003c\/strong\u003e is a high-performance RTD (Resistance Temperature Detector) and resistance analog input module for the SLC 500 PLC platform. Equipped with eight independent input channels, this module is engineered for precision temperature monitoring in complex industrial processes. By utilizing advanced Sigma-Delta Modulation for A\/D conversion, it achieves an exceptional temperature resolution of 0.01°C. Whether monitoring thermal variations in food processing or managing resistance ranges for heavy machinery, the 1746-NR8 provides the high-density I\/O capability required to maintain tight process control.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Configuration\u003c\/h2\u003e\n\u003cp\u003eThe 1746-NR8 is designed for maximum versatility within an SLC 500 chassis:\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eChannel Count:\u003c\/strong\u003e 8 high-accuracy input channels for RTD or direct resistance signals.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInput Ranges:\u003c\/strong\u003e Supports multiple resistance ranges (0–150 Ω, 0–300 Ω, 0–500 Ω, and 0–1000 Ω).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eConversion Technology:\u003c\/strong\u003e Sigma-Delta Modulation ensures superior noise rejection and measurement linearity.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUpdate Rates:\u003c\/strong\u003e Fully adjustable from 6 ms up to 2 seconds to match application dynamics.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSlot Compatibility:\u003c\/strong\u003e Installs into any available I\/O slot of an SLC 500 chassis (except Slot 0).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n    \u003cthead\u003e\n        \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n            \u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eParameter\u003c\/th\u003e\n            \u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eSpecification\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTemperature Resolution\u003c\/td\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e0.01°C\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eStep Response Time\u003c\/td\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e60 ms (In) \/ 2.5 ms (Out)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eBackplane Current (5V)\u003c\/td\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e100 mA\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eBackplane Current (24V)\u003c\/td\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e55 mA\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eOperating Temperature\u003c\/td\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e0°C to 60°C (32°F to 140°F)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003ePower Consumption\u003c\/td\u003e\n            \u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1.82 W Maximum\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003cp\u003eTo integrate the 1746-NR8 into your SLC 500 system, verify that your power supply has sufficient current capacity for the module's 5V and 24V DC backplane requirements.\u003c\/p\u003e\n\n\u003ch3\u003eWiring and Shielding\u003c\/h3\u003e\n\u003cp\u003eRTD signals are highly sensitive to electrical noise. For optimal precision, use high-quality shielded twisted-pair cable for all sensor connections. Ground the cable shield at the module end only to prevent ground loops. The module supports 2, 3, or 4-wire RTD configurations; however, 3 or 4-wire setups are highly recommended to compensate for lead-wire resistance, which is essential for maintaining the rated 0.01°C resolution. Ensure the module is firmly seated and the chassis lever is locked before applying power.\u003c\/p\u003e\n\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cp\u003eThe 1746-NR8 stands out for its \"Precision Performance\" profile, offering a step response as fast as 60 ms for dynamic thermal tracking. Despite its advanced circuitry, the module maintains a lightweight profile with a net \u003cstrong\u003eweight of approximately 0.28 kg\u003c\/strong\u003e, minimizing the physical stress on the backplane connectors. Its wide operating temperature range (0–60°C) makes it resilient in non-conditioned industrial environments. Furthermore, the adjustable update time allows engineers to prioritize either high-speed data acquisition for fast-moving processes or heavy filtering for high-stability measurements in noisy environments.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: Can I mix different RTD types on the same module?\u003c\/strong\u003e\u003cbr\u003e\nA1: Yes, the 1746-NR8 allows you to configure each channel individually through the SLC 500 programming software, supporting various RTD types and resistance ranges simultaneously.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Why does the module use Sigma-Delta Modulation?\u003c\/strong\u003e\u003cbr\u003e\nA2: This modulation technique provides excellent high-frequency noise rejection and high resolution, which is critical when dealing with the low-voltage signals produced by RTD sensors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Is lead-wire compensation automatic?\u003c\/strong\u003e\u003cbr\u003e\nA3: The module automatically compensates for lead-wire resistance when using 3-wire or 4-wire sensor configurations, ensuring that only the sensor's resistance is measured.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51050726719620,"sku":"1746-NR8","price":105.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/7454\/7844\/files\/1746-NR8.jpg?v=1777037812","url":"https:\/\/www.etowonauto.com\/az\/products\/allen-bradley-1746-nr8-rtd-module-input-slc-500","provider":"Etowon Auto","version":"1.0","type":"link"}