{"product_id":"allen-bradley-1794-ip4-b-flex-i-o-high-speed-counter-module","title":"Allen-Bradley 1794-IP4\/B Flex I\/O High-Speed Counter Module","description":"\u003ch2\u003eAllen-Bradley 1794-IP4\/B Flex I\/O High-Speed Counter Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-IP4\/B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-IP4\u003c\/strong\u003e High-Speed Counter \/ Encoder Input Module, operates as a dedicated hardware component for pulse signal acquisition and frequency measurement within the Allen-Bradley Flex I\/O system. It processes high-speed encoder and pulse transmitter inputs through four independent counting channels.\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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-IP4\/B\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\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 55 deg C (32 deg F to 131 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e4.0 W maximum at 31.2 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eHigh-Speed Counter \/ Encoder Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eFlex I\/O Series B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e4 configurable input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V DC nominal, 10 to 31.2 V DC range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexBus Current\u003c\/td\u003e\n\u003ctd\u003e150 mA at 5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Types\u003c\/td\u003e\n\u003ctd\u003eDifferential RS-422 or single-ended 5 V \/ 12 V \/ 24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Input Frequency\u003c\/td\u003e\n\u003ctd\u003eUp to 100 kHz depending on configuration and operating mode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e500 V AC continuous between channels and FlexBus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Base Compatibility\u003c\/td\u003e\n\u003ctd\u003e1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e13.6 BTU\/hr at 31.2 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Rating\u003c\/td\u003e\n\u003ctd\u003eOpen-type, requires installation inside a protective cabinet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network and I\/O Processing Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1794-IP4\/B module is designed for integration into Flex I\/O architectures where high-speed pulse processing is executed at the field I\/O level. The module captures encoder and pulse transmitter signals independently from the main controller scan cycle, reducing processing demand on the PLC CPU.\u003c\/p\u003e\n\u003cp\u003eThe Flex I\/O backplane communication interface transfers module status, counter values, and configuration data through the system bus. The four-channel I\/O density allows multiple pulse acquisition points within a single distributed I\/O station while maintaining channel-level electrical separation.\u003c\/p\u003e\n\u003cp\u003eThe module supports differential RS-422 and single-ended DC input configurations for encoder feedback, proximity detection, frequency measurement, batch counting, and position monitoring functions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 1794-IP4\/B be installed as a hot-swappable module during system operation?\u003c\/strong\u003e\u003cbr\u003eA: The module is part of the Flex I\/O removable terminal base architecture. Hot insertion capability depends on the complete Flex I\/O system configuration and controller operating conditions. Field replacement procedures should follow the applicable Rockwell Automation installation requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the FlexBus current requirement of the module?\u003c\/strong\u003e\u003cbr\u003eA: The 1794-IP4\/B requires 150 mA at 5 V DC from the FlexBus power system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What input signal formats are supported by the counter channels?\u003c\/strong\u003e\u003cbr\u003eA: Each channel supports differential RS-422 signals and single-ended 5 V, 12 V, or 24 V DC pulse input configurations according to the configured operating mode.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1794-IP4\/B on a compatible Flex I\/O terminal base assembly before connecting field wiring. Verify terminal base compatibility with the selected 1794-TB series component.\u003c\/p\u003e\n\u003cp\u003eUse shielded signal wiring for encoder and pulse transmitter connections where electrical noise is present. Connect cable shields according to the plant grounding practice, avoiding parallel routing with high-voltage power conductors.\u003c\/p\u003e\n\u003cp\u003eMaintain separation between low-level pulse signal wiring and motor, drive, or contactor circuits to reduce electromagnetic interference. Confirm that the supplied field voltage remains within the specified 10 to 31.2 V DC operating range before commissioning.\u003c\/p\u003e\n\u003cp\u003eThe module requires installation inside a protective enclosure because it is classified as an open-type industrial component. Confirm correct module seating, terminal engagement, and FlexBus connection before applying system power.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43778395930714,"sku":"1794-IP4\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-IM161.jpg?v=1785743077","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-ip4-b-flex-i-o-high-speed-counter-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}