{"product_id":"1756-ih16i-allen-bradley-controllogix-isolated-input-module","title":"1756-IH16I Allen-Bradley ControlLogix Isolated Input Module","description":"\u003cp\u003eConfigured for high-voltage DC signal monitoring in ControlLogix chassis systems, the \u003cstrong\u003eAllen-Bradley 1756-IH16I\u003c\/strong\u003e (\u003cstrong\u003e1756-IH16I\u003c\/strong\u003e Isolated Input Module) provides 16 individually isolated digital input points for 90 to 146 VDC field signals.\u003c\/p\u003e\n\u003ch3\u003eModel Identification\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1756-IH16I\u003c\/strong\u003e is a ControlLogix DC digital input module designed for applications requiring point-to-point electrical isolation between input channels. Each input point operates independently, allowing separate field circuits to be monitored through the ControlLogix I\/O architecture.\u003c\/p\u003e\n\u003cp\u003eThe module accepts 125 VDC nominal input signals with an operating range of 90 to 146 VDC and transfers input status information through the ControlLogix backplane.\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-IH16I\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\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eIsolated Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA, per supplied product data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e3.8 x 14.6 x 14.0 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003eDC Digital Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Points\u003c\/td\u003e\n\u003ctd\u003e16 individually isolated points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Configuration\u003c\/td\u003e\n\u003ctd\u003eSink-Source\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Input Voltage\u003c\/td\u003e\n\u003ctd\u003e125 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e90 to 146 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Delay Time\u003c\/td\u003e\n\u003ctd\u003e6 ms plus selected filter time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Type\u003c\/td\u003e\n\u003ctd\u003eIndividual channel isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpare Model\u003c\/td\u003e\n\u003ctd\u003e1756IH16I, 1756-IH16I\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndividually Isolated DC Input Interface\u003c\/h3\u003e\n\u003cp\u003eThe 1756-IH16I provides 16 individually isolated digital input channels for monitoring independent DC field circuits. Each input point maintains electrical separation from the other channels, reducing interaction between separate input sources.\u003c\/p\u003e\n\u003cp\u003eThe module supports sink-source input operation and accepts high-voltage DC signals within the specified 90 to 146 VDC operating range.\u003c\/p\u003e\n\u003cp\u003eEach input channel includes configurable filtering characteristics. The input delay consists of a 6 ms base delay plus the selected filter time.\u003c\/p\u003e\n\u003ch3\u003eControlLogix Backplane and I\/O Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1756-IH16I communicates with ControlLogix controllers through the chassis backplane. Input states are transferred from the module to the controller for logic execution and system monitoring.\u003c\/p\u003e\n\u003cp\u003eThe module belongs to the ControlLogix I\/O family, where I\/O density scaling depends on chassis capacity, controller configuration, and available power supply resources.\u003c\/p\u003e\n\u003cp\u003eThe module does not provide Ethernet\/IP communication directly. Network connectivity is handled through separate ControlLogix communication modules installed within the same chassis.\u003c\/p\u003e\n\u003ch3\u003eIndustrial Control Platform Features\u003c\/h3\u003e\n\u003cp\u003eAs an Allen-Bradley ControlLogix module, the 1756-IH16I operates within a modular PLC architecture using backplane bus communication between controller, I\/O, and communication components.\u003c\/p\u003e\n\u003cp\u003eThe module supports isolated channel design for applications where field circuits require independent signal separation. This architecture prevents a fault condition on one input circuit from directly affecting adjacent input channels.\u003c\/p\u003e\n\u003cp\u003eFirmware compatibility and configuration parameters should be matched with the installed Logix controller platform and engineering software version.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1756-IH16I ControlLogix Isolated Input Module\u003c\/li\u003e\n\u003cli\u003eCatalog number: 1756-IH16I\u003c\/li\u003e\n\u003cli\u003eAlternate reference: 1756IH16I\u003c\/li\u003e\n\u003cli\u003eRevision reference: 1756-IH16I\/A\u003c\/li\u003e\n\u003cli\u003eModule function: 16-point individually isolated DC digital input interface\u003c\/li\u003e\n\u003cli\u003eControlLogix chassis, power supply, field wiring accessories, and controller hardware are not included unless separately specified.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003ch4\u003eChassis Installation\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module into a compatible ControlLogix chassis slot.\u003c\/li\u003e\n\u003cli\u003eVerify chassis power capacity before installation.\u003c\/li\u003e\n\u003cli\u003eApply proper ESD protection during handling.\u003c\/li\u003e\n\u003cli\u003eConfirm the module is fully inserted into the backplane connector.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eField Signal Wiring\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eConnect only DC input circuits within the specified 90 to 146 VDC range.\u003c\/li\u003e\n\u003cli\u003eMaintain separation between high-voltage DC signal wiring and communication cables.\u003c\/li\u003e\n\u003cli\u003eUse suitable terminal connections according to the installation design.\u003c\/li\u003e\n\u003cli\u003eVerify input polarity before energizing field circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eConfiguration and Commissioning\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eConfigure input filters according to the required response characteristics.\u003c\/li\u003e\n\u003cli\u003eVerify each isolated input channel independently during commissioning.\u003c\/li\u003e\n\u003cli\u003eConfirm controller recognition and I\/O status before placing the system into operation.\u003c\/li\u003e\n\u003cli\u003eCheck module diagnostics through the Logix controller environment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow many input channels are available on the 1756-IH16I?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module provides 16 individually isolated digital input points. Each channel operates as a separate isolated input circuit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage range does the module accept?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe input operating range is 90 to 146 VDC, with 125 VDC specified as the nominal input voltage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs each input point electrically isolated?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The module provides individual isolation between input points for separate DC field circuit monitoring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of signals can the 1756-IH16I monitor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module monitors DC digital signals using sink-source input configuration within the specified voltage range.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the input delay time?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module has a 6 ms input delay plus the selected filter time configured for the input channel.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1756-IH16I provide output switching?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The module is a digital input device and does not contain output switching channels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the module communicate directly through Ethernet\/IP?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Communication occurs through the ControlLogix backplane. Ethernet\/IP requires a separate communication interface module.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan one input failure affect all channels?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe individually isolated design separates input points, reducing direct electrical interaction between separate field circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066415173805,"sku":"1756-IH16I","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/allen-bradley_1756-ih16i_1.jpg?v=1787191458","url":"https:\/\/www.maxwellplc.com\/products\/1756-ih16i-allen-bradley-controllogix-isolated-input-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}