{"product_id":"allen-bradley-flex-i-o-1794-vhsc-very-high-speed-counter-module","title":"Allen-Bradley Flex I\/O 1794-VHSC Very High Speed Counter Module","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance counting solution within the Allen-Bradley Flex I\/O family, engineered for applications requiring rapid pulse detection and precise motion monitoring. This module is designed to process high-frequency input signals that exceed the scanning capabilities of standard PLC I\/O. By utilizing the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC (PN: 1794-VHSC)\u003c\/strong\u003e, industrial systems can perform real-time encoder feedback, flow metering, and high-speed positioning with minimal latency.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAllen-Bradley \/ Rockwell Automation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFlex I\/O 1794\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVery High Speed Counter (VHSC)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNumber of Counters\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2 Bi-directional Counters\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Configuration\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2 Groups of 3 Inputs (A, B, and Z gate inputs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e5V DC (Nominal)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput On-State Current\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u0026gt; 5 mA\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Off-State Voltage\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u0026lt; 1.8V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Off-State Current\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u0026lt; 0.25 mA\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Configuration\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2 Isolated Groups of 2 Outputs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Supply Voltage Range\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e10–31V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMaximum Power Dissipation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e5.0W @ 31.2V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMaximum Thermal Dissipation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e17.1 BTU\/hr @ 31.2V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e0.25 lbs (0.11 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eOperational Modes and Functional Logic\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esupports multiple operational modes to accommodate various industrial sensing technologies. It can be configured for:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCounter Mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSimple up\/down counting for production totals or flow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEncoder Mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDecoding quadrature signals (increments\/decrements) for motor shaft positioning.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePeriod\/Rate Mode:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCalculating frequency or interval timing for velocity measurements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe module features integrated outputs that can be tied directly to hardware thresholds. This allows the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto trigger an immediate physical output when a specific count is reached, bypassing the communication delay of the network and the PLC scan cycle.\u003c\/p\u003e\n\u003ch2\u003eInstallation and System Compatibility\u003c\/h2\u003e\n\u003cp\u003eAs part of the Flex I\/O system, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003erequires a terminal base for wiring and a communication adapter for network integration.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTerminal Base Requirement:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTypically used with 1794-TB3 or 1794-TB3S bases.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNetwork Compatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFunctions with EtherNet\/IP, ControlNet, DeviceNet, or Remote I\/O adapters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMounting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDIN-rail or panel mount via the terminal base assembly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eCan the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ehandle 24V DC input signals?\u003c\/p\u003e\n\u003cp\u003eWhile the base inputs are designed for 5V DC (TTL level), many applications use external level shifters or specific terminal base configurations to accommodate higher voltage encoders. Always verify the input voltage source to prevent damaging the 5V logic.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum input frequency for this module?\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis rated to handle frequencies up to 1 MHz in certain configurations, making it significantly faster than standard high-speed counter modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAre the outputs independently isolated?\u003c\/p\u003e\n\u003cp\u003eThe outputs are organized into two isolated groups. This provides electrical separation between different output circuits, enhancing noise immunity and system reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52458124902709,"sku":"1794-VHSC","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1794-VHSC1.png?v=1773998982","url":"https:\/\/www.5gplc.com\/products\/allen-bradley-flex-i-o-1794-vhsc-very-high-speed-counter-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}