{"product_id":"allen-bradley-1794-ir8-a-flex-i-o-rtd-input-module","title":"Allen-Bradley 1794-IR8\/A FLEX I\/O RTD Input Module","description":"\u003ch2\u003eAllen-Bradley 1794-IR8\/A FLEX I\/O RTD Input Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1794-IR8\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1794-IR8\u003c\/strong\u003e RTD Input Module, operates as a dedicated hardware component for resistance temperature acquisition within FLEX I\/O control networks. It provides 8-channel RTD and resistance signal conversion for programmable controllers through compatible 1794 adapter interfaces.\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-IR8\/A\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\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e46 x 94 x 53 mm\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\u003eMax 3.0 W at 31.2 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003e8 Point RTD Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e8 RTD \/ resistance input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003eRTD and direct resistance measurement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Sensors\u003c\/td\u003e\n\u003ctd\u003ePt 100 ohm, Pt 200 ohm, Pt 500 ohm, Pt 1000 ohm, Ni 120 ohm, Cu 10 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistance Range\u003c\/td\u003e\n\u003ctd\u003e0 to 1000 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Wiring\u003c\/td\u003e\n\u003ctd\u003e2-wire and 3-wire RTD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resolution\u003c\/td\u003e\n\u003ctd\u003e16-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Format\u003c\/td\u003e\n\u003ctd\u003e16-bit 2's complement integer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexBus Current\u003c\/td\u003e\n\u003ctd\u003e20 mA at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Power Supply\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal, 10.5 to 31.2 VDC range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConversion Rate\u003c\/td\u003e\n\u003ctd\u003eApprox. 325 ms for 8-channel scan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e50 V continuous channel-to-system, tested at 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-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProfinet \/ EtherNet\/IP Deterministic Network Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1794-IR8\/A interfaces analog temperature signals through the FLEX I\/O architecture using compatible adapter modules. Communication with controller platforms is performed through supported FLEX I\/O network adapters including EtherNet\/IP, ControlNet, and DeviceNet configurations.\u003c\/p\u003e\n\u003cp\u003eThe module provides I\/O density scaling within distributed control architectures by converting multiple RTD inputs into digital controller data. The 16-bit conversion structure allows PLC and PAC systems to process resistance-based temperature measurements using standard FLEX I\/O data transfer mechanisms.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What type of temperature sensors can be connected to the 1794-IR8\/A?\u003cbr\u003eA: The module accepts Platinum, Nickel, and Copper RTD sensors, including Pt 100 ohm, Pt 200 ohm, Pt 500 ohm, Pt 1000 ohm, Ni 120 ohm, and Cu 10 ohm configurations.\u003c\/p\u003e\n\u003cp\u003eQ: Is the 1794-IR8\/A installed directly onto a controller rack?\u003cbr\u003eA: No. The module is installed on a compatible FLEX I\/O terminal base and communicates with the controller through a 1794 network adapter interface.\u003c\/p\u003e\n\u003cp\u003eQ: Does the module support replacement under powered conditions?\u003cbr\u003eA: The FLEX I\/O platform supports removal and insertion under power (RIUP) for applicable modules and terminal connections. Actual replacement procedures must follow the applicable installation documentation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1794-IR8\/A onto the specified FLEX I\/O terminal base and verify mechanical locking before connecting field wiring. Confirm terminal base compatibility before energizing the module.\u003c\/p\u003e\n\u003cp\u003eUse shielded instrumentation wiring where required by the installation environment. Keep RTD signal cables separated from motor power, relay switching, and high-current conductors to minimize electrical noise coupling.\u003c\/p\u003e\n\u003cp\u003eVerify RTD wiring configuration before commissioning. Two-wire and three-wire sensor connections must match the selected field wiring arrangement to maintain measurement accuracy.\u003c\/p\u003e\n\u003cp\u003eConnect the external 24 VDC supply with correct polarity and verify grounding according to the control panel electrical design. Maintain operating temperature and humidity conditions within the specified module limits.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43778398945370,"sku":"1794-IR8\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-IRT81.jpg?v=1778469546","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-ir8-a-flex-i-o-rtd-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}