{"product_id":"allen-bradley-1771-ifm-plc-5-fast-millivolt-analog-input-module","title":"Allen-Bradley 1771-IFM PLC-5 Fast Millivolt Analog Input Module","description":"\u003cp\u003eConfigured for high-speed analog voltage processing in Allen-Bradley PLC-5 systems, the \u003cstrong\u003eAllen-Bradley 1771-IFM\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-IFM\u003c\/strong\u003e Fast Millivolt Input Module, provides direct physical\/electrical execution across 8 isolated signal channels. The unit accepts low-level differential millivolt signals, converting field voltage data directly to 16-bit binary numeric format for real-time backplane transfer. It operates with a current draw of 0.75 A at 5 VDC directly from the 1771 I\/O chassis backplane logic bus, bypassing the need for external module logic power supplies.\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\u003e1771-IFM\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.30 lbs (0.59 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e11.5 in x 4.5 in x 2.0 in (29.2 cm x 11.4 cm x 5.1 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C (32 to 140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.75 A @ 5 VDC (Backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e8 differential inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Input Ranges\u003c\/td\u003e\n\u003ctd\u003e0 to 50 mV, 0 to 100 mV, -50 to +50 mV, -100 to +100 mV DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Bus Compatibility\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley 1771 I\/O Chassis (PLC-5 System)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication \u0026amp; Deterministic Processing\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1771-IFM integrates directly with the PLC-5 backplane bus, utilizing high-speed parallel transfer to maintain deterministic I\/O scan timing across all 8 input channels. Firmware flash compatibility and backplane timing synchronization allow the module to perform analog-to-digital conversions with minimum scan latencies. Digital filtering algorithms within the module onboard processing circuit attenuate high-frequency industrial field noise while ensuring high channel density scaling across standard 1771 I\/O chassis slots. Channel data is presented to the processor block transfer structure, mitigating backplane signal degradation across multi-rack topologies.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the primary source of operational power for the 1771-IFM input card?\u003c\/p\u003e\n\u003cp\u003eA: The module draws its operational logic power directly from the 1771 I\/O chassis backplane bus at 0.75 A at 5 VDC. Field signals require separate proper isolation, but no external secondary power supply is required for module backplane operation.\u003c\/p\u003e\n\u003cp\u003eQ: How does channel-to-channel noise impact millivolt signal acquisition on this unit?\u003c\/p\u003e\n\u003cp\u003eA: The module utilizes differential signal routing for each of its 8 channels to minimize common-mode noise interference. To maintain signal integrity at low millivolt levels, field wiring must use individually shielded twisted-pair cables with proper single-point shield grounding.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Isolation\u003c\/strong\u003e: Ensure main chassis power is turned off before inserting or removing the 1771-IFM module from the 1771 I\/O rack. Hot-swapping without removing chassis power may cause unexpected system faults or transient backplane disturbance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeying Pin Placement\u003c\/strong\u003e: Insert the plastic keying bands into the chassis backplane connector corresponding to positions between pins 10\/12 and pins 24\/26 to prevent incorrect module insertion into standard I\/O slots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring \u0026amp; Shielding\u003c\/strong\u003e: Connect field millivolt conductors using high-grade shielded twisted-pair cable. Terminate signal shields exclusively at the designated wiring arm chassis ground terminal or single-point system ground bar. Do not ground both ends of the cable shield to prevent ground loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArming \u0026amp; Latching\u003c\/strong\u003e: Secure the field wiring arm (1771-WA) onto the module front housing. Ensure the swing-arm mechanical latch locks securely onto the upper and lower chassis rails to resist industrial vibration.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52652906250520,"sku":"1771-IFM","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1771-OVN_Cocoai_f2a618eb-759e-412c-b9b2-158f51c44da4.jpg?v=1789437674","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1771-ifm-plc-5-fast-millivolt-analog-input-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}