{"product_id":"allen-bradley-1794-oe8h-b-flex-i-o-analog-output-module","title":"Allen-Bradley 1794-OE8H\/B FLEX I\/O Analog Output Module","description":"\u003ch2\u003eAllen-Bradley 1794-OE8H\/B FLEX I\/O Analog Output Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for HART-enabled analog current output execution in FLEX I\/O systems, the \u003cstrong\u003eAllen-Bradley 1794-OE8H\/B\u003c\/strong\u003e (\u003cstrong\u003e1794-OE8H\u003c\/strong\u003e Analog Output Module) provides direct physical\/electrical execution for 4-20 mA signal generation and HART communication pass-through functions.\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-OE8H\/B (Series 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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eHART Analog Output Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e6.1 W maximum at 31.2 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e8 single-ended analog output channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal Range\u003c\/td\u003e\n\u003ctd\u003e4-20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHART Support\u003c\/td\u003e\n\u003ctd\u003eDedicated HART modem per channel with communication pass-through\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e13 bits (12.5 bits for 4-20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexBus Current\u003c\/td\u003e\n\u003ctd\u003e80 mA at 5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Power Supply\u003c\/td\u003e\n\u003ctd\u003e24 V DC nominal (19.2 to 31.2 V DC including 5% AC ripple)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Power Current\u003c\/td\u003e\n\u003ctd\u003e190 mA at 24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpdate Time\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;= 10 ms for all channels updated to FLEX Bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStep Response\u003c\/td\u003e\n\u003ctd\u003e18 ms to 99% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eChannel-to-backplane optical isolation, tested at 850 V AC 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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Indicators\u003c\/td\u003e\n\u003ctd\u003ePower LED, fault LEDs, HART communication LEDs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConformal Coating\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHART Communication and Analog Output Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1794-OE8H\/B provides eight current output channels with integrated HART communication capability. Each channel includes a dedicated HART modem path, allowing simultaneous transmission of 4-20 mA analog signals and digital HART data to compatible field devices.\u003c\/p\u003e\n\u003cp\u003eThe module operates within the FLEX I\/O architecture through FlexBus communication and supports optical isolation between field channels and the backplane interface. The isolated design separates field wiring conditions from controller-side communication circuits.\u003c\/p\u003e\n\u003cp\u003eThe module supports deterministic EtherNet\/IP, ControlNet, and other FLEX I\/O network architectures through compatible adapter interfaces. Firmware flash compatibility shall be verified before replacement or system upgrades.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1794-OE8H\/B support direct HART communication on each output channel?\u003cbr\u003eA: Yes. Each of the eight analog output channels contains a dedicated HART modem for digital communication pass-through while maintaining 4-20 mA output operation.\u003c\/p\u003e\n\u003cp\u003eQ: Is the module hot-swappable during system operation?\u003cbr\u003eA: Installation or removal procedures shall follow the FLEX I\/O system power and terminal base handling requirements. Hot-swap capability depends on the installed system configuration and controller architecture.\u003c\/p\u003e\n\u003cp\u003eQ: What isolation method is used between field signals and the backplane?\u003cbr\u003eA: The module uses channel-to-backplane optical isolation to separate field-side analog circuits from FLEX Bus communication circuits.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module on compatible FLEX I\/O terminal bases such as 1794-TB3G or 1794-TB3GS before field wiring connection.\u003c\/li\u003e\n\u003cli\u003eVerify 24 V DC field power polarity and supply quality before energizing the module.\u003c\/li\u003e\n\u003cli\u003eRoute analog signal wiring separately from high-voltage switching conductors to reduce electrical interference.\u003c\/li\u003e\n\u003cli\u003eApply appropriate cable shielding and connect shields according to the plant grounding standard.\u003c\/li\u003e\n\u003cli\u003eMaintain separation between HART-enabled signal wiring and high-noise power cables.\u003c\/li\u003e\n\u003cli\u003eConfirm controller adapter compatibility and firmware requirements before commissioning replacement modules.\u003c\/li\u003e\n\u003cli\u003eCheck LED status indicators after installation to verify power, fault, and HART communication conditions.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43782663405658,"sku":"1794-OE8H\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-OE8H1.jpg?v=1785811323","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-oe8h-b-flex-i-o-analog-output-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}