{"product_id":"xf821a-honeywell-panel-bus-analog-input-module","title":"XF821A | Honeywell | Panel Bus Analog Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell XF821A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eXF821A\u003c\/strong\u003e Panel Bus Analog Input Module, operates as a dedicated hardware component for resistive temperature signal acquisition within Excel 800 and CIPer 50 control systems. It executes physical signal conversion across 8 analog input channels, supporting multiple resistance temperature detector types without requiring complex external conditioning networks.\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\u003eXF821A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to +50 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e5 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e8 analog inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Sensors\u003c\/td\u003e\n\u003ctd\u003eNTC10k, NTC20k, Ni1000, Pt1000, Pt3000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003ePanel Bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL864 (UUKL) Smoke Control certified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation And Panel Bus Architecture\u003c\/h3\u003e\n\u003cp\u003eOperating within DCS and process control ecosystems, the module implements strict signal processing boundaries to maintain measurement fidelity. The Panel Bus interface handles deterministic data exchange with parent controllers, ensuring low-latency status reporting for temperature loops. Circuitry is designed to process resistive sensor inputs directly, reducing common-mode noise and stabilizing analog-to-digital conversion parameters in industrial building automation environments.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the XF821A support hot-swapping during active system operation?\u003c\/p\u003e\n\u003cp\u003eA: Hot-swapping is restricted depending on the specific backplane power and controller configuration; power should be removed from the local node prior to module extraction or insertion to prevent bus communication faults.\u003c\/p\u003e\n\u003cp\u003eQ: What is the primary communication protocol used to interface with the Excel 800 controller?\u003c\/p\u003e\n\u003cp\u003eA: The module communicates via the proprietary Panel Bus interface, which provides synchronized data transfer and power distribution over a local multi-drop connection.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the module securely onto a standard DIN rail inside a protective electrical enclosure.\u003c\/li\u003e\n\u003cli\u003eEnsure the 24 VAC\/DC power supply is isolated and disconnected before wiring field terminals.\u003c\/li\u003e\n\u003cli\u003eTerminate shielded cables for resistive temperature sensors properly, ensuring the shield drain wire is grounded at a single, low-impedance earth point to mitigate electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eVerify all sensor connections against the pinout documentation for NTC10k, NTC20k, Ni1000, Pt1000, or Pt3000 types prior to system power-up.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":67910832947496,"sku":"XF821A","price":315.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0827\/6266\/2184\/files\/XF821A.png?v=1792138564","url":"https:\/\/www.powerdcs.com\/products\/xf821a-honeywell-panel-bus-analog-input-module","provider":"Power DCS Parts Limited","version":"1.0","type":"link"}