{"product_id":"allen-bradley-1746-ni4-analog-input-module","title":"Allen-Bradley 1746-NI4 Analog Input Module","description":"\u003ch1\u003eAllen-Bradley 1746-NI4 Analog Input Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for analog signal acquisition in SLC 500 I\/O scan cycles, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746-NI4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1746-NI4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ehigh-resolution input module) provides direct electrical conversion of bipolar voltage and current signals into 16-bit digital values across SLC 500 backplane communication architecture.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo suffix segmentation is defined for 1746-NI4. The model is a single catalog entry within the SLC 500 analog input module family.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\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\u003e1746-NI4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003eAllen-Bradley\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e5 V DC backplane 25 mA; 24 V DC 85 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e4 differential inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e-10 to 10 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current Range\u003c\/td\u003e\n\u003ctd\u003e-20 to 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16 bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConversion Method\u003c\/td\u003e\n\u003ctd\u003eSigma-Delta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStep Response\u003c\/td\u003e\n\u003ctd\u003e60 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e1 MOhm (voltage); 250 Ohm (current)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Isolation\u003c\/td\u003e\n\u003ctd\u003e710 V DC \/ 500 V AC (1 min)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSLC 500 Backplane Signal Conversion Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1746-NI4 executes sigma-delta sampling at module level prior to backplane transfer, converting analog differential signals into scaled digital words synchronized with SLC 500 scan timing. Channel acquisition is multiplexed internally, with fixed conversion sequencing per input channel.\u003c\/p\u003e\n\u003cp\u003eBackplane communication uses deterministic scan exchange where converted data is mapped into processor input image tables. Channel isolation is implemented at the front-end signal conditioning stage, separating field-side analog references from backplane logic ground.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1746-NI4 support hot-swapping in an energized SLC 500 chassis?\u003cbr\u003eA: No. Module insertion or removal requires chassis power shutdown due to backplane electrical coupling constraints.\u003c\/p\u003e\n\u003cp\u003eQ: What is the impact of backplane load on system design?\u003cbr\u003eA: The module consumes 25 mA at 5 V DC and 85 mA at 24 V DC, which must be included in total rack power budgeting.\u003c\/p\u003e\n\u003cp\u003eQ: Can voltage and current inputs be used simultaneously across channels?\u003cbr\u003eA: Yes. Each channel supports independent configuration for -10 to 10 V DC or -20 to 20 mA input ranges.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module in an SLC 500-compatible rack slot with verified backplane capacity. Ensure field wiring follows differential pair routing practices to reduce common-mode noise. Maintain separation between analog input wiring and high-voltage conductors. Shield termination shall be grounded at a single panel reference point. Avoid exceeding specified input impedance loading limits when connecting external transmitters or signal conditioners.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43505272848474,"sku":"1746-NI4","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746-N142.jpg?v=1781603215","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746-ni4-analog-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}