{"product_id":"1771-sn-allen-bradleyplc-5-sub-i-o-scanner-module","title":"1771-SN | Allen-BradleyPLC-5 Sub-I\/O Scanner Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1771-SN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a Sub-I\/O Scanner module within the Universal 1771 I\/O platform. It extends the control capabilities of a PLC-5 processor by managing a dedicated Universal Remote I\/O (RIO) link. This module acts as an intelligent interface, scanning remote I\/O chassis and discrete devices to update the processor's data table. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your legacy control architecture maintains peak timing accuracy and communication integrity.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1771-SN utilizes the PLC-5 backplane to execute high-speed block transfers while maintaining a minimal power footprint.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAllen-Bradley \/ Rockwell Automation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Line:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePLC-5 (1771 I\/O)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Type:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSub-I\/O Scanner Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCommunication Protocol:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUniversal Remote I\/O (RIO)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProcessor Communication:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBlock-Transfer via PLC-5 Backplane\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSlot Occupancy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1 Slot\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e0.2 Amperes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring Arm:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1771-WN\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTypical DC Signal Delay:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3 ms (On) \/ 30 ms (Off)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTypical AC Signal Delay:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e11 ms (On) \/ 29 ms (Off)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.94 lbs (0.88 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDistributed Architecture Expansion:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1771-SN enables the processor to control I\/O located thousands of feet away from the main chassis. This capability reduces local wiring costs and allows for the decentralization of control cabinets across large manufacturing floors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEfficient Backplane Utilization:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWith a low current draw of only 0.2 Amperes, this module places minimal thermal and electrical stress on the 1771 power supply. This efficiency allows engineers to populate more communication and I\/O modules within a single rack without exceeding power limits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Block Transfers:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module utilizes Block-Transfer instructions to move large arrays of data between the scanner and the PLC-5 processor. This method ensures that the controller receives comprehensive diagnostic and status data without consuming multiple scan cycles for individual bit updates.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHardware Compatibility Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe use of the standard 1771-WN wiring arm ensures secure field connections. Furthermore, the mechanical keying of the 1771 chassis prevents the accidental insertion of non-compatible modules into the scanner slot, safeguarding the system from electrical mismatch and hardware damage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the 1771-SN communicate with the PLC-5 processor?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module uses Block-Transfer Read (BTR) and Block-Transfer Write (BTW) instructions. The processor initiates these transfers to exchange I\/O image data and status information with the scanner's internal memory.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require a specific software configuration?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eYes. You must configure the Remote I\/O scan list within the PLC-5 programming software (such as RSLogix 5). You define the rack addresses, group starting points, and I\/O sizes to ensure the scanner correctly identifies all remote adapters on the link.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 1771-SN be used in a remote chassis?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNo. The 1771-SN must reside in the same local chassis as the PLC-5 processor (or in an extended local chassis) because it functions as a scanner, not an adapter. It manages the link that remote adapters connect to.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the significance of the signal delay specifications?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe delay specifications (e.g., 3 ms for DC On) represent the time the module takes to process signal transitions. Understanding these values is critical for engineers designing high-speed interlocking or safety-related logic where millisecond-level precision determines system safety.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52590205337909,"sku":"1771-P5E-A","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1771-SN.jpg?v=1776412987","url":"https:\/\/www.5gplc.com\/products\/1771-sn-allen-bradleyplc-5-sub-i-o-scanner-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}