{"product_id":"bently-nevada-3500-40m-125680-01-proximitor-i-o-module","title":"Bently Nevada 3500\/40M 125680-01 Proximitor I\/O Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003e\u003cspan class=\"citation-127\"\u003eThe Bently Nevada\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e125680-01\u003c\/strong\u003e\u003cspan class=\"citation-127 citation-end-127\"\u003e\u003cspan\u003e \u003c\/span\u003eis a 4-channel Proximitor I\/O Module with Internal Terminations engineered for the 3500 Series Machinery Protection System.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eSeated in the rear slot of the 3500 instrumentation rack, this module serves as the direct hardware interface linking external eddy current proximity transducers to the front-facing 3500\/40M Proximitor Monitor module.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"citation-126 citation-end-126\"\u003eThe unit provides stable sensor power excitation, receives raw analog displacement voltages, and channels these conditioned paths into the main processor card to calculate machinery metrics like radial vibration, shaft eccentricity, thrust position, differential expansion, and REBAM.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eArmed with an integrated screw-terminal block, the 125680-01 eliminates the need for separate external termination panels, saving critical footprint space within dense control room cabinets.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBently Nevada\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3500\/40M (Rear Component)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePart Number \/ ID\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e125680-01\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eProximitor I\/O Module (Internal Terminations)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSystem Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3500 Series Machinery Protection System\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eChannel Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Non-Isolated Proximity Transducer Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSignal Input Impedance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 kΩ for Proximitor Inputs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTermination Connection\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBuilt-in Multi-position Screw Terminal Block\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e7.7 Watts Typical\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTransducer Support\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBently Nevada 3300 XL 8mm, 11mm, and 25mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMeasurements\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRadial Vibration, Thrust, Eccentricity, REBAM\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (WxHxD)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24.4 mm x 241.3 mm x 99.1 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Net Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.20 kg (0.44 lb)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUnited States (USA)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cp\u003eTurbomachinery monitoring hardware modifications dictate checking explicit spare part numbers. Procure replacements strictly matching the factory ordering codes below.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMain System Component Suffix:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3500\/40M\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFactory Order Part Number:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e125680-01\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Core Variant:\u003c\/strong\u003e\u003cspan class=\"citation-125 citation-end-125\"\u003e\u003cspan\u003e \u003c\/span\u003eStandard Full-Height Rear I\/O Module\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering Notes \u0026amp; Field Wiring Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTransducer Signal Termination Layout\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe internal termination block of the 125680-01 handles up to four field proximity sensor arrays. Each signal channel grouping contains three dedicated screw terminals:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVTX \/ Prox (+):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTransducer power supply voltage rail (typically -24V DC excitation).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSIG \/ In (S):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eContinuous analog raw gap voltage returned from the Proximitor sensor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCOM \/ Gnd (-):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCommon instrumentation reference return line.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStrip conductor insulation back exactly 7 mm. Use high-grade 3-wire twisted-shielded instrumentation cables (18 AWG to 22 AWG copper) to prevent magnetic induction anomalies from distorting high-frequency signals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCable Shield Grounding Protocols\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTerminate individual outer cable shields at the 3500 chassis frame to prevent EMI\/RFI noise. Shield lines must be bundled and bonded to the unpainted rack frame grounding bar using a wide-surface ground clamp.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eNever\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003etie the cable shield into the terminal block's signal common (COM) screws; doing so generates ground loops that can mask critical high-amplitude vibrations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLive-Swapping Safety Constraints\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 3500 architecture allows hot-swapping; however, pulling a rear I\/O module immediately cuts excitation power to field sensors, triggering a \"Monitor Fault.\"\u003c\/p\u003e\n\u003col class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eToggle the rack’s front keylock switch to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\"PROGRAM\"\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emode.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"citation-124\"\u003eEnable software channel\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003ebypass flags\u003c\/strong\u003e\u003cspan class=\"citation-124 citation-end-124\"\u003e\u003cspan\u003e \u003c\/span\u003evia the 3500 Rack Configuration Software.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProceed with physical removal to prevent downstream emergency trip relays from activating.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch3\u003eMaintenance \u0026amp; Troubleshooting FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary difference between the 125680-01 and external termination modules?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 125680-01 contains built-in screw terminal arrays on its back faceplate, allowing field wiring to anchor directly to the module. External termination variants require high-density multi-pin ribbon cables to connect to a separate DIN-rail terminal panel mounted elsewhere.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 125680-01 module accept signals from non-Bently Nevada proximity sensors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. Internal pathways and scaling matrices are calibrated specifically for Bently Nevada proximity transducers. Third-party probes will break linear scale factors, invalidating measurement conversions and generating calibration errors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do you troubleshoot an individual channel showing a persistent \"NOT OK\" status?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Measure the raw DC gap voltage across the SIG and COM terminals with a multimeter. A healthy probe displays between -4V DC and -16V DC. If the voltage is near 0V or mirrors the full -24V supply, the fault is likely a cable short or open conductor in the field rather than an I\/O module failure.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666859290987,"sku":"125680-01","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-125680-01-proximitor-i-o-module-nch0io30ar2_8104b65d-e1e6-431e-b4e2-7a9ec8d0e125.jpg?v=1765449252","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-40m-125680-01-proximitor-i-o-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}