{"product_id":"allen-bradley-1794-vhsc-flex-i-o-high-speed-counter-module","title":"Allen-Bradley 1794-VHSC Flex I\/O High-Speed Counter Module","description":"\u003cp\u003eConfigured for high-speed pulse counting and frequency processing in EtherNet-enabled control networks, the \u003cstrong\u003eAllen-Bradley 1794-VHSC\u003c\/strong\u003e (\u003cstrong\u003e1794-VHSC\u003c\/strong\u003e Very High Speed Counter Module) provides direct physical\/electrical execution. This 2-channel intelligent interface conditions differential encoder or pulse signals up to 1 MHz and executes real-time output switching across Allen-Bradley Flex I\/O platforms.\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\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-VHSC\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\u003e0.56 lbs (0.26 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.7 x 3.7 x 2.7 in (94 x 94 x 69 mm) with base\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\u003e5.0 W at 31.2 VDC max (Thermal: 17.1 BTU\/hr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexbus Current\u003c\/td\u003e\n\u003ctd\u003e75 mA at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e2 counter channels (2 groups of 3 inputs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Input Frequency\u003c\/td\u003e\n\u003ctd\u003e1 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal External Power\u003c\/td\u003e\n\u003ctd\u003e24 VDC (19.2-31.2 VDC range, 100 mA at 24 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Ratings\u003c\/td\u003e\n\u003ctd\u003e2 isolated groups (0.5 A at 5 VDC, 1.0 A at 12-24 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e50 V continuous isolation between 6 areas (850 VDC for 1 s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Terminal Bases\u003c\/td\u003e\n\u003ctd\u003e1794-TB3G, 1794-TB3GS (Keyswitch Position 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity \u0026amp; EtherNet\/IP Networks\u003c\/h3\u003e\n\u003cp\u003eThe 1794-VHSC module interface links directly to the Flexbus backplane, drawing 75 mA at 5 VDC while transmitting high-speed counter telemetry across deterministic EtherNet\/IP adapter networks. Up to 1 MHz pulse frequencies are processed on-module, offloading high-velocity axis tracking from the main PLC processor. Basic galvanic insulation tested at 850 VDC for 1 second maintains 50 V continuous channel-to-backplane isolation, protecting counting logic against field noise and common-mode surge propagation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What key-switch position must be selected on the terminal base for the 1794-VHSC?\u003c\/p\u003e\n\u003cp\u003eA: The terminal base key-switch must be rotated to position 1 to properly seat and key the 1794-VHSC module.\u003c\/p\u003e\n\u003cp\u003eQ: Which terminal base units are compatible with the 1794-VHSC counter module?\u003c\/p\u003e\n\u003cp\u003eA: The module installs directly onto either the 1794-TB3G or 1794-TB3GS grounded screw\/spring terminal base units.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum pulse input frequency supported by the 1794-VHSC channels?\u003c\/p\u003e\n\u003cp\u003eA: The input channels support high-speed pulse and quadrature encoder signals at frequencies up to 1 MHz.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eSet the keyswitch on the 1794-TB3G or 1794-TB3GS terminal base unit to position 1 before attempting insertion.\u003c\/li\u003e\n\u003cli\u003ePush the 1794-VHSC module firmly into the terminal base until the locking mechanism latches completely into the backplane connector.\u003c\/li\u003e\n\u003cli\u003eWire encoder signals using shielded twisted-pair cables, terminating shields at the designated ground terminals on the base.\u003c\/li\u003e\n\u003cli\u003eConnect external 24 VDC field power (19.2 to 31.2 VDC operating window) to supply output driver circuits and field transmitter loops.\u003c\/li\u003e\n\u003cli\u003eEnsure cabinet ambient conditions maintain operating temperatures between 0 and 55 deg C with non-condensing humidity between 5% and 95%.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52786764939544,"sku":"1794-VHSC","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1794-OB16P_2.png?v=1790650324","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1794-vhsc-flex-i-o-high-speed-counter-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}