{"product_id":"1771-ia-c-allen-bradley-discrete-input-module-plc-5-series","title":"1771-IA\/C Allen-Bradley Discrete Input Module PLC-5 Series","description":"\u003cp\u003eConfigured for direct field sensing execution in PLC-5 local and remote I\/O chassis, the \u003cb\u003eAllen-Bradley 1771-IA\/C\u003c\/b\u003e (\u003cb\u003e1771-IA\u003c\/b\u003e) Discrete Input Module provides direct physical\/electrical execution by interfacing 120 VAC\/VDC discrete field signals to the system processor.\u003c\/p\u003e\n\u003ch3\u003eVariant Matrix \u0026amp; Model Designations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e1771-IA\u003c\/b\u003e: Base 8-channel discrete input module operating within 120 VAC\/VDC input voltage thresholds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e1771-IA\/C\u003c\/b\u003e: Revision C iteration featuring updated hardware component sourcing and standardized backplane contact plating.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e1771-IA Series\u003c\/b\u003e: Encompasses all functional hardware revisions (A through C) sharing identical field wiring arm connection assignments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eElectrical \u0026amp; Physical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1771-IA\/C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOrigin\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.46 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eShipping Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.0 x 14.5 x 25.3 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temp\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.375 W (75 mA at 5 VDC backplane current)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eChannel Count\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 inputs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInput Voltage Category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e120 VAC\/VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAC Operating Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e87 to 138 VAC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDC Operating Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e97 to 138 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMax AC Off-State Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.8 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTypical AC Signal Delay (On)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24 (+\/- 10) ms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTypical DC Signal Delay (On)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 (+\/- 4) ms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTypical DC Signal Delay (Off)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20 (+\/- 9) ms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCompatible Chassis\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1771-AB through 1771-A4B\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Communication Velocity \u0026amp; Determinism\u003c\/h3\u003e\n\u003cp\u003eThe module utilizes dedicated backplane logic circuitry to interface directly with the PLC-5 processor over the 1771 backplane bus structure. Channel status data is continuously mapped into the input image table during standard I\/O scan sweeps. Internal optocouplers ensure isolated signal transfer, preventing high-voltage line transients from affecting backplane bus communication velocity or corrupting adjacent logic modules inside the rack enclosure.\u003c\/p\u003e\n\u003ch3\u003eStandard Package Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e1 x Allen-Bradley 1771-IA\/C Discrete Input Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1 x Instruction sheet\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \u0026amp; Wiring Rules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eKey the 1771 chassis slot using plastic keying bands inserted between backplane pins 10 and 12, and pins 24 and 26.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDisconnect all backplane and field power sources prior to inserting or removing the module from the rack.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUtilize the 1771-WN wiring arm for field conductor terminations to allow module replacement without disturbing field wiring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRoute AC input conductors separately from low-level DC analog or communication cables in dedicated wireways.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure all field wiring conduit connections meet local grounded raceway compliance standards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSystem Technical FAQs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum backplane current draw for the 1771-IA\/C module?\u003c\/p\u003e\n\u003cp\u003eThe module draws a maximum of 75 mA from the 1771 backplane bus logic supply at 5 VDC.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan this input module accept both AC and DC field signal inputs?\u003c\/p\u003e\n\u003cp\u003eYes, the hardware supports 87 to 138 VAC operating signals as well as 97 to 138 VDC discrete field inputs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum allowable off-state current for AC inputs?\u003c\/p\u003e\n\u003cp\u003eThe maximum off-state leakage current permitted without causing a false signal state trigger is 2.8 mA.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs hot-swapping permitted for this module during active system operation?\u003c\/p\u003e\n\u003cp\u003eNo, removing or inserting the module under power can cause electrical arcing, backplane disruption, or processor faults.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhich chassis types accept the 1771-IA\/C hardware assembly?\u003c\/p\u003e\n\u003cp\u003eThe module installs into standard 1771 universal I\/O chassis, including 1771-AB through 1771-A4B system enclosures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat are the typical turn-on delay times for AC vs DC operational modes?\u003c\/p\u003e\n\u003cp\u003eTypical signal delay on transition is 24 (+\/- 10) ms for AC inputs and 10 (+\/- 4) ms for DC inputs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the module require an external logic power supply connection?\u003c\/p\u003e\n\u003cp\u003eNo external logic supply is required; all internal control circuitry power is derived directly from the chassis backplane bus.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow are field wiring connections made to the front of the unit?\u003c\/p\u003e\n\u003cp\u003eConnections terminate at an interchangeable 1771-WN field wiring arm that latches securely into the chassis frame.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066443321517,"sku":"1771-IA\/C","price":129.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/k_1-0.jpg?v=1786453964","url":"https:\/\/www.maxwellplc.com\/ga\/products\/1771-ia-c-allen-bradley-discrete-input-module-plc-5-series","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}