{"product_id":"allen-bradley-1756-if8hk-hart-analog-input-module","title":"Allen-Bradley 1756-IF8HK HART Analog Input Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-IF8HK HART Analog Input Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eConfigured for differential analog signal acquisition with integrated HART communication in ControlLogix backplane systems, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-IF8HK\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-IF8HK\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eHART analog input module, provides direct electrical conversion of 8-channel differential voltage\/current inputs with embedded HART digital signal extraction across isolated I\/O paths.\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\u003e1756-IF8HK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.81 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3.21–4.01 W max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e8 differential inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Types\u003c\/td\u003e\n\u003ctd\u003eCurrent and voltage with HART overlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16–21 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e300 mA at 5.1 VDC, 70 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e13.7 BTU\/hour\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eOpen input module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocol Support\u003c\/td\u003e\n\u003ctd\u003eHART\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEtherNet\/IP Backplane HART Signal Decoupling Behavior\u003c\/h3\u003e\n\u003cp\u003eThe module performs simultaneous acquisition of analog process signals and superimposed HART digital communication over shared current loop wiring. Within the ControlLogix backplane architecture, analog-to-digital conversion and HART demodulation are executed in parallel processing paths, separating low-frequency process variables from high-frequency HART FSK signals. Channel-level differential measurement reduces common-mode noise, while backplane scheduling distributes scan load across cyclic I\/O updates.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the module process HART and analog signals simultaneously?\u003cbr\u003eA: Yes. The module extracts HART digital communication while maintaining continuous analog signal conversion per channel.\u003c\/p\u003e\n\u003cp\u003eQ: Are all 8 channels galvanically isolated?\u003cbr\u003eA: The module supports differential inputs with channel-level isolation behavior defined by ControlLogix architecture and terminal configuration.\u003c\/p\u003e\n\u003cp\u003eQ: What limits the number of active channels in high-load operation?\u003cbr\u003eA: Backplane current availability and scan cycle timing determine effective channel update rates under full configuration.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eThe module shall be installed in a ControlLogix chassis slot with system power removed prior to insertion of the RTB assembly. All HART-enabled loops must maintain proper 250 Ω minimum loop resistance to ensure signal modulation integrity. Shielded twisted pair cabling is required for differential inputs, with shield termination performed at a single control cabinet ground point. Wiring routes shall be separated from high-frequency switching conductors to prevent induced noise on HART FSK carrier signals. Terminal block seating must be verified before energizing backplane power.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43602253873242,"sku":"1756-IF8HK","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-IF8HK2.jpg?v=1783317637","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-if8hk-hart-analog-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}