{"product_id":"allen-bradley-1794-ip4-flex-i-o-4-channel-pulse-counter-module","title":"Allen-Bradley 1794-IP4 FLEX I\/O 4-Channel Pulse Counter Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1794-IP4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-speed pulse acquisition interface within the FLEX I\/O distributed architecture. This module captures rapid electronic signals from encoders, flow meters, and proximity switches that exceed the processing capabilities of standard digital input cards. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your control system maintains precise count accuracy for high-speed manufacturing and bottling applications.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFour (4) Pulse Counter Interfaces\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Frequency\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100 kHz (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMinimum Pulse Width\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 \u003cspan class=\"math-inline\"\u003e$\\mu$\u003c\/span\u003es\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNominal Input Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Voltage Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6V DC to 26.4V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput ON Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6V to 26.4V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput OFF Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-26.4V to 3V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFlexbus Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5mA @ 5V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5W @ 26.4V DC Max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 55 °C (32 to 131 °F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Deterministic Counting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1794-IP4 handles input frequencies up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100 kHz\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith a minimum pulse width of only\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"math-inline\"\u003e$\\mu$\u003c\/span\u003es\u003c\/strong\u003e. This high temporal resolution allows the module to track extremely fast-moving targets or high-flow turbines where standard PLCs would skip pulses.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFlexible Terminal Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis module docks seamlessly onto multiple terminal bases, including the 1794-TB2, -TB3, and -TBN. This modularity allows engineers to select the specific termination style (screw, spring, or fused) that best fits the cabinet's wiring density and safety requirements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Signal Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe internal circuitry provides\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e500V DC isolation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebetween the field inputs and the Flexbus logic side. This barrier protects the expensive communication adapter and backplane from electrical transients, surges, and ground loops originating at the sensor level.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCompact DIN Rail Mounting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe small footprint and vertical DIN rail mounting capability facilitate installation in narrow control enclosures. By offloading high-speed counting to a distributed FLEX I\/O rack, you reduce central cabinet clutter and shorten field wiring runs to the sensors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIndustrial Durability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWith an operating shock rating of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e30g\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand vibration resistance up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e5g\u003c\/strong\u003e, the 1794-IP4 withstands the mechanical stress of heavy industrial machinery. It maintains data integrity in environments prone to constant mechanical oscillation and impact.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support quadrature encoders?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1794-IP4 is primarily a pulse counter module. While it excels at frequency measurement and totalizing from four independent sources, you should verify if your specific motion control logic requires a dedicated quadrature (A\/B) phase module or if your CPU can process the dual-phase logic via these high-speed inputs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the significance of the 6V DC minimum ON-state voltage?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module requires at least 6V DC to register a pulse. This threshold provides excellent noise immunity, as it prevents low-level induced voltages or electrical \"ghost\" signals on long cable runs from triggering false counts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace the 1794-IP4 without removing the terminal base?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The FLEX I\/O system utilizes a \"Removal and Insertion Under Power\" (RIUP) design for the electronic modules. You can snap the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBrand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1794-IP4 module onto the existing terminal base without disturbing any field wiring, significantly reducing maintenance downtime.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I handle the shield for high-speed pulse wiring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor 100 kHz signals, we recommend using shielded twisted-pair cable. Connect the shield to a clean ground at the terminal base side to prevent electromagnetic interference (EMI) from distorting the pulse edges, ensuring the module detects every 2\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"math-inline\"\u003e$\\mu$\u003c\/span\u003es pulse accurately.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53382677004472,"sku":"1794-IP4","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1794-IP4.jpg?v=1776933189","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1794-ip4-flex-i-o-4-channel-pulse-counter-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}