{"product_id":"allen-bradley-1791-n4c2-analog-block-i-o-module-4-inputs-2-outputs","title":"Allen-Bradley 1791-N4C2 Analog Block I\/O Module | 4 Inputs \u0026 2 Outputs","description":"\u003ch2\u003eAllen-Bradley 1791-N4C2: Reliable Analog I\/O Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cb\u003eAllen-Bradley 1791-N4C2\u003c\/b\u003e is a flexible Block I\/O module. It adds analog control to your PLC system. This compact module has 4 inputs and 2 outputs. It works perfectly with older Allen-Bradley controllers. The \u003cb style=\"color: #0275d8;\"\u003e1791-N4C2\u003c\/b\u003e is easy to install and set up. It helps you read sensors and control devices accurately.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits \u0026amp; Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eVersatile Inputs:\u003c\/b\u003e 4 channels can be set as voltage or current input.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eStable Outputs:\u003c\/b\u003e 2 reliable current outputs (0-20mA) for precise control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWide Compatibility:\u003c\/b\u003e Works with PLC-2, PLC-3, PLC-5\/250, and SLC family controllers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEasy Power:\u003c\/b\u003e Includes a 24V DC source for loop-powered sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHigh Accuracy:\u003c\/b\u003e Provides 0.1% accuracy for trustworthy measurements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSimple Wiring:\u003c\/b\u003e Designed for straightforward series connection in panels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDetailed Technical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eBrand \u0026amp; Model:\u003c\/b\u003e Allen-Bradley \u003cb style=\"color: #0275d8;\"\u003e1791-N4C2\u003c\/b\u003e\u003cbr\u003e\u003cb\u003eModule Type:\u003c\/b\u003e Block I\/O Analog Module\u003cbr\u003e\u003cb\u003eTotal Channels:\u003c\/b\u003e 6 (4 Inputs, 2 Outputs)\u003cbr\u003e\u003cb\u003eInput Types:\u003c\/b\u003e 4 Selectable (Voltage or Current)\u003cbr\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 10 MΩ\u003cbr\u003e\u003cb\u003eOutput Type:\u003c\/b\u003e 2 Current Outputs (0-20 mA)\u003cbr\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e \u0026lt; 1 Ω\u003cbr\u003e\u003cb\u003eAbsolute Accuracy:\u003c\/b\u003e ±0.1% @ 25°C\u003cbr\u003e\u003cb\u003eUpdate Rate:\u003c\/b\u003e 10 ms per channel\u003cbr\u003e\u003cb\u003ePower Supply:\u003c\/b\u003e 120V AC\u003cbr\u003e\u003cb\u003eAuxiliary Power:\u003c\/b\u003e 24V DC Sensor Supply (Current-limited)\u003cbr\u003e\u003cb\u003eMax Power Dissipation:\u003c\/b\u003e 16.9 Watts\u003cbr\u003e\u003cb\u003eCompatible Controllers:\u003c\/b\u003e PLC-2, PLC-3, PLC-5\/250, SLC Family\u003cbr\u003e\u003cb\u003eCommunication:\u003c\/b\u003e Block Transfer or Discrete Transfer\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 1.25 lbs (0.57 kg)\u003c\/p\u003e\n\u003ch3\u003eEasy Installation \u0026amp; Use\u003c\/h3\u003e\n\u003cp\u003eMount the module on a DIN rail inside your control panel. Wire the blocks in a series, not parallel. Connect your sensors to the input terminals. Connect your output devices like valve positions to the output terminals. Use the 24V DC source to power loop-powered transmitters. Configure the inputs as voltage or current in your controller program.\u003c\/p\u003e\n\u003ch3\u003ePackage \u0026amp; Warranty Information\u003c\/h3\u003e\n\u003cp\u003eYou will receive:\u003cbr\u003e• 1 x Allen-Bradley 1791-N4C2 Analog I\/O Module\u003cbr\u003e• Product documentation\u003cbr\u003e(Note: Mounting hardware and cables sold separately)\u003c\/p\u003e\n\u003cp\u003eWe provide a full \u003cb style=\"color: #5cb85c;\"\u003e12-month warranty\u003c\/b\u003e against defects. Your purchase is protected for reliable performance.\u003c\/p\u003e\n\u003ch3\u003eFast Global Shipping\u003c\/h3\u003e\n\u003cp\u003eWe deliver worldwide using trusted carriers: \u003cb\u003eFedEx, UPS, and DHL\u003c\/b\u003e. Tracking information is provided for all orders.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eCan I use this module with a modern CompactLogix or ControlLogix PLC?\u003c\/h4\u003e\n\u003cp\u003eNo, this module is designed for older PLC platforms like PLC-5 and SLC 500. For newer ControlLogix, you would need a different series of analog modules.\u003c\/p\u003e\n\u003ch4\u003eWhat types of sensors can I connect to the inputs?\u003c\/h4\u003e\n\u003cp\u003eYou can connect standard 0-10V or 4-20mA sensors. Examples include temperature transmitters, pressure sensors, or level transducers. Remember to set the input type correctly.\u003c\/p\u003e\n\u003ch4\u003eHow do I configure the input type (voltage or current)?\u003c\/h4\u003e\n\u003cp\u003eThe configuration is done through your controller's programming software (like RSLogix 5). You set it in the block transfer setup, not by physical switches on the module.\u003c\/p\u003e\n\u003ch4\u003eThe output is \"clamped.\" What does this mean?\u003c\/h4\u003e\n\u003cp\u003eIf your program sends a value outside the 0-20mA range, the output will not exceed its limits. It will stay at 0mA for low values or 20mA for high values, protecting connected devices.\u003c\/p\u003e\n\u003ch4\u003eHow many of these modules can I use in one system?\u003c\/h4\u003e\n\u003cp\u003eThe number depends on your controller's I\/O capacity and power supply. They must be wired in series on the I\/O rack. Check your PLC's manual for the maximum number of block transfer modules allowed.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e© 2025 Ubest Automation Limited. All rights reserved.\u003cbr\u003eOriginal Source: \u003ca href=\"https:\/\/www.ubestplc.com\/\"\u003ehttps:\/\/www.ubestplc.com\/\u003c\/a\u003e\u003cbr\u003eContact: \u003ca href=\"mailto:sales@ubestplc.com\"\u003esales@ubestplc.com\u003c\/a\u003e Phone: \u003ca href=\"https:\/\/wa.me\/8618030005825\"\u003e+86 180 3000 5825\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51524007854362,"sku":"1791-N4C2","price":263.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/6240\/4634\/files\/1791-N4C2.jpg?v=1791450198","url":"https:\/\/www.ubestplc.com\/products\/allen-bradley-1791-n4c2-analog-block-i-o-module-4-inputs-2-outputs","provider":"Ubest Automation Limited","version":"1.0","type":"link"}