{"product_id":"foxboro-fbm214b-rh927ah-communication-input-module","title":"FOXBORO FBM214b RH927AH Communication Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eFoxboro FBM214B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eFBM214B RH927AH\u003c\/strong\u003e HART Communication Input Module, operates as a dedicated hardware component for multi-channel analog signal processing and digital data extraction within Foxboro distributed control networks. This ruggedized processing card, weighing 0.3 kg under part number \u003cstrong\u003eRH927AH\u003c\/strong\u003e, provides direct physical and electrical execution by routing 4–20 mA current loops and superimposed high-frequency digital variables from field transmitters to central system subracks.\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\u003eFBM214B RH927AH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFoxboro (Schneider Electric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eFactory Standard Global Site\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.3 kg (0.66 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e2.2 cm $\\times$ 12.4 cm $\\times$ 12.6 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +60 deg C (-4 to +140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C (-40 to +158 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e8 analog input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Signals\u003c\/td\u003e\n\u003ctd\u003e4–20 mA analog input; HART digital FSK signals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Sense Resistor\u003c\/td\u003e\n\u003ctd\u003e61.5 Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Input Resistance\u003c\/td\u003e\n\u003ctd\u003e280 Ohm nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-0.03% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e15 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpdate Rate\u003c\/td\u003e\n\u003ctd\u003e100 ms per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntegration Time\u003c\/td\u003e\n\u003ctd\u003e500 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Mode Rejection\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;100 dB at 50 or 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control and DCS Instrumentation Execution\u003c\/h3\u003e\n\u003cp\u003eThe FBM214B RH927AH manages high-density current loops and FSK modulation matrices directly across the system's distribution backplane. To resolve dynamic process loops and demultiplex complex secondary variables concurrently without software loop execution lag or analog-to-digital signal drift, the module's 15-bit conversion subsystem enforces a rapid 100 ms per channel update rate across the 8-channel active bank. This speed prevents measurement latency during rapid process perturbations, directly supporting deterministic loop tracking rules and expanding physical I\/O density scaling options within specialized marshalling enclosures.\u003c\/p\u003e\n\u003cp\u003eBecause the module links directly to high-consequence field instruments, the processing architecture relies on robust channel-to-channel isolation circuits alongside advanced cold junction compensation and digital filtering techniques. This ensures that raw 4–20 mA HART loop protocol fields, secondary device statuses, and diagnostics pass to the host controllers with complete channel safety, avoiding ground loops, signal cross-talk, or backplane communication timeouts.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the module extract digital HART data without corrupting the underlying 4–20 mA primary analog measurement?\u003c\/p\u003e\n\u003cp\u003eA: The module utilizes Frequency Shift Keying (FSK) demodulation to split the signal paths. The digital HART data is superimposed on the current loop as a high-frequency AC waveform ($1200\\text{ Hz}$ and $2200\\text{ Hz}$) which averages out to zero net current, ensuring that the 15-bit analog tracking registers read the true 4–20 mA base value without offset or noise.\u003c\/p\u003e\n\u003cp\u003eQ: What specific hardware actions are triggered when the common mode noise exceeds the standard rejection limits?\u003c\/p\u003e\n\u003cp\u003eA: The integrated filtering circuitry maintains a common mode rejection ratio of $\u0026gt;100\\text{ dB}$ at 50 or 60 Hz. If external noise breaks this threshold, the affected channel's internal tracking registers flag an input out-of-bounds error code to the DCS processor, isolating that specific data field to prevent corrupt readings from upsetting downstream logic execution.\u003c\/p\u003e","brand":"Foxboro","offers":[{"title":"Default Title","offer_id":45058729640051,"sku":"FBM214b RH927AH","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-06-01_17-36-20.png?v=1780306803","url":"https:\/\/www.dcssupplier.com\/products\/foxboro-fbm214b-rh927ah-communication-input-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}