{"product_id":"1794-im8-allen-bradley-flex-i-o-digital-input-module","title":"1794-IM8 Allen-Bradley FLEX I\/O Digital Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-IM8\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-IM8\u003c\/strong\u003e Digital Input Module, operates as a dedicated hardware component for discrete AC signal conversion within FLEX I\/O platforms. This open-style subassembly interfaces directly with high-voltage field devices, transforming 240 VAC alternating current binary signals into logic states. The module routes the processed input status data across the local backplane network interface to the primary host controller without introducing cyclic buffering latency.\u003c\/p\u003e\n\u003ch3\u003eModel Suffix Configurations\u003c\/h3\u003e\n\u003cp\u003eThe alphanumeric tracking matrix defines the electronic architecture and density boundaries of the device. The sequence \"1794\" enforces physical and electrical footprint standardization with the modular FLEX I\/O chassis framework. The code \"IM\" defines an alternating current discrete input structure, while the digit \"8\" fixes the high-voltage channel allocation configuration across the terminal base matrix.\u003c\/p\u003e\n\u003ch3\u003eElectrical and Physical Parameters\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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\u003e1794-IM8\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\u003e0.1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e9.3x5.5x4.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eDetermined by local Flexbus backplane draw and external 240 VAC loop inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channel Count\u003c\/td\u003e\n\u003ctd\u003e8 Points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Category\u003c\/td\u003e\n\u003ctd\u003e240 VAC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical Profile\u003c\/td\u003e\n\u003ctd\u003eOpen style IP20 housing structure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Orientation\u003c\/td\u003e\n\u003ctd\u003eSymmetrical DIN rail tracking alignment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Determinism and Scaling\u003c\/h3\u003e\n\u003cp\u003eThe hardware processing unit handles localized I\/O density scaling by executing cyclic data sensing directly across the multi-pin terminal base connection path. The inner bus transceiver operations execute within strict backplane bus communication velocity Licences parameters to prevent performance degradation on deterministic EtherNet\/IP networks. The microcode design matches precise electrical keying configurations to ensure complete firmware flash compatibility with upstream communication adapters.\u003c\/p\u003e\n\u003ch3\u003eShipping Package Manifest\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x 1794-IM8 discrete AC input hardware module\u003c\/li\u003e\n\u003cli\u003e1 x high-voltage installation sequence reference guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWiring and Cabinet Mounting Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDIN Rail Attachment Path\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSeat the upper hook section of the IP20 plastic frame onto the top rail of the DIN track, then swing the bottom downward until the spring locking clip clicks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTerminal Base Insertion Sequence\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAlign the structural registration alignment grooves on the bottom plate with the terminal base pin matrix, applying vertical down-force until the component is seated.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Voltage Signal Termination\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStrip the 240 VAC field conductors and secure them into the designated terminal block paths, ensuring appropriate high-voltage insulation separation from low-voltage DC links.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEquipotential Chassis Ground Path\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEstablish a low-impedance copper grounding bond from the DIN rail tracking directly to the main cabinet structural earth point to mitigate transient common-mode noise fields.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat mechanical boundaries govern the hot-swapping sequence of this 240 VAC input card?\u003c\/p\u003e\n\u003cp\u003eRemoval and Insertion Under Power (RIUP) is supported when utilizing a compatible terminal base, but the external 240 VAC source line loops must be physically isolated to prevent severe electrical arcing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does the module react if a 240 VAC input line encounters a severe voltage drop?\u003c\/p\u003e\n\u003cp\u003eWhen line voltage drops below the minimal ON-state threshold, the internal optical isolation circuit stops conducting, causing the module to register a logic zero status state.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes this alternating current hardware configuration share an internal common return line between channels?\u003c\/p\u003e\n\u003cp\u003eThe channels are grouped internally according to the matching terminal base terminal configuration parameters, requiring proper common terminal bridging at the terminal block assembly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat state failure signature occurs at the PLC if the backplane bus logic experiences a disruption?\u003c\/p\u003e\n\u003cp\u003eA local bus fault flags a slot connection timeout error inside the master project tree, causing the controller to mark all 8 discrete inputs as invalid or unpowered.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat procedure clears a channel fault flag after resolving a field wiring issue?\u003c\/p\u003e\n\u003cp\u003eThe hardware automatically updates its internal state registers based on the incoming 240 VAC line parameters once the external electrical field conditions are restored.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does concurrent activation of all 8 channels affect the thermal balance inside an IP20 box?\u003c\/p\u003e\n\u003cp\u003eContinuous activation of all points at maximum line voltage increases heat output, demanding compliance with the 55 deg C ambient temperature ceiling and panel spacing paths.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan this standard AC input card track high-frequency electronic pulse streams from flow sensors?\u003c\/p\u003e\n\u003cp\u003eNo. The module features integrated hardware filters specifically configured to filter out 50\/60 Hz line bounce noise, rendering it unsuitable for high-speed pulse acquisition tasks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat approach corrects an electronic keying validation mismatch when hot-swapping identical hardware?\u003c\/p\u003e\n\u003cp\u003eThe software engineer must update or check the I\/O configuration properties inside the programming tree to ensure firmware flash compatibility attributes align with the physical device label.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066457051309,"sku":"1794-IM8","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1794-IM8_13.jpg?v=1784213730","url":"https:\/\/www.maxwellplc.com\/ga\/products\/1794-im8-allen-bradley-flex-i-o-digital-input-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}