{"product_id":"1771-ifms-allen-bradley-intrinsically-safe-millivolt-input-module","title":"1771-IFMS Allen-Bradley Intrinsically Safe Millivolt Input Module","description":"\u003ch2\u003e\u003cstrong\u003eAllen-Bradley 1771-IFMS Intrinsically Safe Fast Millivolt Input Module for PLC5\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Technical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e\u003c\/span\u003e Allen-Bradley \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e intrinsically safe fast millivolt input module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eInput Channels:\u003c\/strong\u003e\u003c\/span\u003e 8 differential inputs through intrinsically safe connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eInput Voltage Range:\u003c\/strong\u003e\u003c\/span\u003e 0-50 mV DC (low-level millivolt signals).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eResolution \u0026amp; Accuracy:\u003c\/strong\u003e\u003c\/span\u003e 12-bit binary; accuracy 0.1% of range @ 25°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eLinearity \u0026amp; Repeatability:\u003c\/strong\u003e\u003c\/span\u003e ±1 LSB linearity, ±1 LSB repeatability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eA\/D Converter:\u003c\/strong\u003e\u003c\/span\u003e Monotonic output with no missing codes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eUpdate Time:\u003c\/strong\u003e\u003c\/span\u003e 14.5 ms for all 8 differential channels (without digital filtering).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eData Format:\u003c\/strong\u003e\u003c\/span\u003e ±32,767 binary or ±9999 BCD scaling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eInput Impedance:\u003c\/strong\u003e\u003c\/span\u003e 1 Megaohm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eCommon-Mode Rejection:\u003c\/strong\u003e\u003c\/span\u003e 100 dB at 60 Hz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eInput Overvoltage Protection:\u003c\/strong\u003e\u003c\/span\u003e 32V DC (maximum input ±10V DC operating range).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eBackplane Current:\u003c\/strong\u003e\u003c\/span\u003e 750 mA @ 5V DC (no external power required).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eProtective Coating:\u003c\/strong\u003e\u003c\/span\u003e Conformal coating protects against moisture and contaminants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eSignal Delays (typical):\u003c\/strong\u003e\u003c\/span\u003e DC Off 20 ms (±9 ms); AC Off 24 ms (±10 ms).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eWiring Arm:\u003c\/strong\u003e\u003c\/span\u003e Includes \u003cstrong\u003e1771-WG\u003c\/strong\u003e field wiring arm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eTemperature \u0026amp; Humidity:\u003c\/strong\u003e\u003c\/span\u003e Operating 0 to 60°C; humidity 5-95% non-condensing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #2563eb;\"\u003e\u003cstrong\u003eShock Rating:\u003c\/strong\u003e\u003c\/span\u003e Operating 15G, non-operating 30G.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation \u0026amp; Wiring Guidelines\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMounts in any 1771 I\/O chassis and occupies a single slot (rack mountable).\u003c\/li\u003e\n\u003cli\u003eUse the included \u003cstrong\u003e1771-WG\u003c\/strong\u003e wiring arm for all field connections; torque screws to 0.8-1.0 Nm (7-9 lb-in).\u003c\/li\u003e\n\u003cli\u003eAcceptable wire size: 0.25-2.5 mm² (22-14 AWG) solid or stranded copper with 75°C insulation rating.\u003c\/li\u003e\n\u003cli\u003eKeying bands: install between pins 10-12 (lower) and 24-26 (upper) for correct module insertion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #b91c1c;\"\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e\u003c\/span\u003e The \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e does not support removal or insertion under power (RIUP). Always power down the PLC5 system before installation or removal.\u003c\/li\u003e\n\u003cli\u003eFollow electrostatic discharge (ESD) precautions when handling the module.\u003c\/li\u003e\n\u003cli\u003eEquipment connected to the non-intrinsically safe side must not generate voltages exceeding 250V RMS.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eIntrinsically Safe \u0026amp; Environmental Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for hazardous locations with intrinsic safety barriers on field wiring.\u003c\/li\u003e\n\u003cli\u003eConformal coating provides additional protection against moisture and corrosion.\u003c\/li\u003e\n\u003cli\u003eMonotonic A\/D converter ensures no missing codes for reliable low-level signal conversion.\u003c\/li\u003e\n\u003cli\u003eHigh common-mode rejection (100 dB at 60 Hz) minimizes interference in industrial environments.\u003c\/li\u003e\n\u003cli\u003eComplies with T6 North American temperature code for hazardous area installations.\u003c\/li\u003e\n\u003cli\u003eInput overvoltage protection up to 32V safeguards the module against wiring faults.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAllen‑Bradley \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e intrinsically safe fast millivolt input module (1 unit).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1771-WG\u003c\/strong\u003e wiring arm (attached or included separately).\u003c\/li\u003e\n\u003cli\u003eQuick reference documentation leaflet.\u003c\/li\u003e\n\u003cli\u003eAnti‑static protective packaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat does \"intrinsically safe\" mean for the \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e?\u003c\/strong\u003e The module connects to field devices through intrinsic safety barriers, limiting energy in hazardous areas. This prevents ignition in explosive atmospheres while allowing normal signal measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat types of sensors work with the \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e?\u003c\/strong\u003e It accepts low-level millivolt signals from thermocouples, strain gauges, pressure transducers, and other sensors with 0-50 mV output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy choose the \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e over standard analog modules?\u003c\/strong\u003e Its 0-50 mV range, 14.5 ms fast update, and intrinsic safety certification make it the only choice for hazardous locations requiring precise low-voltage measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan I install or remove this module while the system is powered?\u003c\/strong\u003e No, the \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e does not support RIUP. You must power down the PLC5 chassis before installation or removal to prevent damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat wire size and torque should I use for the 1771-WG wiring arm?\u003c\/strong\u003e Use 22-14 AWG copper wire with 75°C insulation. Tighten screws to 0.8-1.0 Nm (7-9 lb-in) for reliable connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the update time for all eight channels?\u003c\/strong\u003e The module scans all eight differential inputs in 14.5 ms without digital filtering, providing fast response for critical millivolt signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes the module provide overvoltage protection?\u003c\/strong\u003e Yes, it includes input overvoltage protection up to 32V, though the normal operating range is ±10V DC maximum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is your typical shipping time for the \u003cstrong\u003e1771-IFMS\u003c\/strong\u003e?\u003c\/strong\u003e We stock this item as new original surplus. We ship within 5 days after order confirmation via FedEx, UPS, or DHL.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan I return the module if it doesn't meet my needs?\u003c\/strong\u003e Yes, we accept returns within 30 days. The module must be in new, unused condition with its original packaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eContact Information Inquiries:\u003c\/strong\u003e \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e | \u003ca href=\"https:\/\/wa.me\/8615392429628\" target=\"_blank\"\u003e+86 153 9242 9628\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePartner:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.nex-auto.com\/\" target=\"_blank\"\u003eNexAuto Technology Limited\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45822576001185,"sku":"1771-IFMS","price":240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/1771-IFMS.jpg?v=1773642905","url":"https:\/\/www.autonexcontrol.com\/fr\/products\/1771-ifms-allen-bradley-intrinsically-safe-millivolt-input-module","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}