{"product_id":"allen-bradley-slc-500-8-channel-temperature-card-1746-nr8","title":"Allen Bradley SLC 500 8-Channel Temperature Card 1746-NR8","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Allen Bradley 1746-NR8 operates as a high-density, 8-channel RTD and resistance analog input module designed explicitly for the legacy SLC 500 programmable logic controller platform. This open-style chassis card translates low-voltage resistance variations from field temperature sensors into precise digital values for the central SLC processor. Although the original manufacturer designated this model as a legacy item, we supply this product exclusively as a 100% brand new, original unit in its authentic factory box to guarantee immediate replacement compatibility and long-term asset lifecycle expansion.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eManufacturer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen Bradley (Rockwell Automation)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel Number\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1746-NR8\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCore Platform Series\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSLC 500 Systems\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInput Channel Density\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 Isolated Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSupported Signal Types\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePt100, Ni100, Cu100 RTDs, and Pure Resistance Inputs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSelectable Input Ranges\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 500 Ohms, 0 to 1000 Ohms, 0 to 3000 Ohms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMeasurement Resolution\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.05 Ohms (500 Ohm range), 0.1 Ohms (1000 Ohm range), 0.3 Ohms (3000 Ohm range)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModule Base Accuracy\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePlus or minus 0.3 Percent of Full Scale\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eChannel Conversion Speed\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 100 ms per channel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eContinuous Isolation Rating\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e50 V continuous (Channel-to-backplane circuit)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBackplane Current Draw (5 VDC)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e150 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePhysical Wiring Interface\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRemovable 1746-HT Terminal Block\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temperature Limits\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 Degrees Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eStorage Temperature Limits\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to 85 Degrees Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePermissible Humidity Range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to 95 Percent Non-Condensing Relative Humidity\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eNet Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.48 kg (0.75 lbs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHardware Package Footprint\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e127 x 51 x 152 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eFood processing facilities, chemical plants, and heavy thermal energy networks require exceptionally stable temperature monitoring to maintain process safety and batch consistency. The 1746-NR8 addresses these processing demands by providing 8 high-accuracy input channels within a single slot footprint, allowing engineers to maximize slot utilization inside standard SLC 500 chassis. The module supports multiple selectable resistance ranges (0 to 500, 1000, and 3000 Ohms) to match Pt100, Ni100, and Cu100 RTD physical characteristics without needing external signal conditioning transducers.\u003c\/p\u003e\n\u003cp\u003eThe hardware utilizes an advanced channel filtering design that rejects common high-frequency electromagnetic interference (EMI) originating from large induction motors and nearby variable frequency drives (VFDs). A robust continuous isolation barrier rated for 50 V defends the internal backplane bus against stray field ground loops, preventing field electrical noise from corrupting data on the primary processor.\u003c\/p\u003e\n\u003cp\u003eTo accelerate field installation and maintenance cycles, the module features a removable 1746-HT wiring terminal block. Field technicians can swap a compromised input card out of the rack without loosening individual sensor signal wires, entirely eliminating rewiring errors and cutting downtime.\u003c\/p\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan technicians mix different types of RTD sensors across the 8 channels of a single 1746-NR8 module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The software configuration tools within RSLogix 500 allow independent channel definition. Maintenance teams can configure Channel 0 for a Pt100 sensor while assigning Channel 1 to a direct Ohm resistance sensor or a different RTD element type, maximizing local flexibility.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat specific diagnostic steps help isolate a sensor wiring issue from an internal card hardware fault?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1746-NR8 communicates granular diagnostic bits directly to the SLC 500 controller data table. An open-circuit or short-circuit condition on the field wiring triggers a specific under-range or over-range bit for that exact channel, enabling operators to identify broken wires on the factory floor without pulling the module from the chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module draw power directly from an external 24 VDC power supply terminal line?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 1746-NR8 derives all required operational voltages directly from the standard SLC 500 backplane power supply bus, consuming 150 mA at 5 VDC. This self-contained layout eliminates the need to route extra external power loops to the card, reducing cabinet wiring clutter.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43392592543834,"sku":"1746-NR8","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/100._4bba1ed1-cf78-480c-9de0-d66391f450cb.jpg?v=1779174069","url":"https:\/\/www.spareoil.com\/products\/allen-bradley-slc-500-8-channel-temperature-card-1746-nr8","provider":"SpareOil Automation","version":"1.0","type":"link"}