{"product_id":"1756-if8h-allen-bradley-controllogix-hart-analog-input-module","title":"1756-IF8H Allen-Bradley ControlLogix HART Analog Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-IF8H\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1756-IF8H\u003c\/strong\u003e Analog Differential Input Module, operates as a dedicated hardware component for current and voltage signal acquisition within ControlLogix automation platforms.\u003c\/p\u003e\n\u003ch3\u003eModel Reference\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1756-IF8H is an 8-channel analog input module with HART communication capability. It provides differential input channels for analog current and voltage measurements and exchanges process data through the ControlLogix backplane system.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\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-IF8H\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAnalog Differential Input Module with HART\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\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\u003e0.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e3.8 x 15.2 x 14.0 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e13.7 BTU per hour thermal dissipation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003eDifferential analog inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e8 points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Type\u003c\/td\u003e\n\u003ctd\u003eCurrent and voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocol\u003c\/td\u003e\n\u003ctd\u003eHART protocol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd\u003e300 mA @ 5.1 VDC; 135 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOpen Circuit Detection Time\u003c\/td\u003e\n\u003ctd\u003ePositive full scale reading within 5 s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlLogix Backplane and HART Communication Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1756-IF8H integrates into the ControlLogix chassis through the backplane communication architecture. The module transfers analog process values and HART device information between field instruments and the Logix controller.\u003c\/p\u003e\n\u003cp\u003eAllen-Bradley ControlLogix systems use deterministic backplane communication for module data exchange. The 1756-IF8H supports firmware flash compatibility within the ControlLogix platform and requires correct electronic keying and controller configuration before operation.\u003c\/p\u003e\n\u003ch3\u003eHART Signal Processing Capability\u003c\/h3\u003e\n\u003cp\u003eThe module supports HART-enabled field devices by combining analog measurement with digital communication data transmission over compatible input channels. Channel configuration, input range selection, and HART device parameters are managed through the ControlLogix programming environment.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1756-IF8H ControlLogix Analog Differential Input Module\u003c\/li\u003e\n\u003cli\u003e1 x Removable terminal block interface compatible with ControlLogix installation requirements\u003c\/li\u003e\n\u003cli\u003eStandard module label and identification markings\u003c\/li\u003e\n\u003cli\u003eControlLogix chassis, power supply, and communication accessories are not included unless separately specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify module compatibility with the installed ControlLogix chassis before installation.\u003c\/li\u003e\n\u003cli\u003eConfirm field wiring polarity for differential current and voltage input channels.\u003c\/li\u003e\n\u003cli\u003eInstall the module using correct grounding and shielding practices for analog signal wiring.\u003c\/li\u003e\n\u003cli\u003eSeparate analog signal cables from high-voltage power conductors.\u003c\/li\u003e\n\u003cli\u003eConfigure input ranges and HART parameters before connecting field devices.\u003c\/li\u003e\n\u003cli\u003eCheck controller diagnostics after module insertion and startup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFirmware and Network Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe 1756-IF8H requires compatible ControlLogix firmware and controller configuration. Module firmware revisions, electronic keying settings, and Logix project parameters must match the installed automation system to ensure correct operation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat type of signals can the 1756-IF8H measure?\u003c\/p\u003e\n\u003cp\u003eThe module supports differential analog current and voltage input signals through eight independent input channels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow many input channels are available?\u003c\/p\u003e\n\u003cp\u003eThe 1756-IF8H provides 8 analog differential input points for field signal acquisition.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the module support HART communication?\u003c\/p\u003e\n\u003cp\u003eYes. The module supports HART protocol communication for compatible field instruments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the backplane current consumption?\u003c\/p\u003e\n\u003cp\u003eThe module requires 300 mA at 5.1 VDC and 135 mA at 24 VDC from the ControlLogix chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs the module hot-swappable?\u003c\/p\u003e\n\u003cp\u003eControlLogix supports removal and insertion under specific conditions, but field wiring and safety procedures must be considered before replacement.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat happens when an input circuit is open?\u003c\/p\u003e\n\u003cp\u003eThe module can detect an open circuit condition and provides a positive full scale reading within 5 seconds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the module require controller firmware matching?\u003c\/p\u003e\n\u003cp\u003eYes. Compatible ControlLogix firmware and module revision settings are required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat wiring practices are recommended for analog inputs?\u003c\/p\u003e\n\u003cp\u003eShielded signal wiring, proper grounding, and separation from power cables are recommended to reduce signal interference.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066414420141,"sku":"1756-IF8H","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1756-IF8H-0.jpg?v=1786350493","url":"https:\/\/www.maxwellplc.com\/products\/1756-if8h-allen-bradley-controllogix-hart-analog-input-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}