{"product_id":"allen-bradley-1756-dnb-d-devicenet-communication-module","title":"Allen Bradley 1756-DNB\/D DeviceNet Communication Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen Bradley 1756-DNB\/D DeviceNet Communication Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen Bradley 1756-DNB\/D\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-DNB\/D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDeviceNet Communication Module, operates as a dedicated hardware component for DeviceNet cyclic data exchange and network object management within ControlLogix backplane-based communication architecture.\u003c\/p\u003e\n\u003cp\u003eConfigured for DeviceNet protocol execution in ControlLogix chassis systems, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen Bradley 1756-DNB\/D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-DNB\/D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDeviceNet Communication Module) provides direct physical and logical mapping between Logix5000 controller tags and DeviceNet network devices via deterministic messaging and polling cycles.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe “\/D” suffix identifies a revision level within the 1756-DNB hardware lineage. No additional functional segmentation or field-configurable variants are defined in the provided specification.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\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\u003e1756-DNB\/D\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e145 mm x 35 mm x 140 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e~800 mA at 5 VDC (backplane powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Network\u003c\/td\u003e\n\u003ctd\u003eDeviceNet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaud Rates\u003c\/td\u003e\n\u003ctd\u003e125 \/ 250 \/ 500 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Nodes\u003c\/td\u003e\n\u003ctd\u003e64 devices per network\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeviceNet Input Voltage\u003c\/td\u003e\n\u003ctd\u003e11 to 25 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003e5-pin Phoenix connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and DeviceNet Deterministic Network Scheduling (ControlLogix Integration Layer)\u003c\/h3\u003e\n\u003cp\u003eThe 1756-DNB\/D module executes cyclic DeviceNet polling synchronized with ControlLogix backplane scan execution. Network scheduling is governed by fixed baud rate selection and object-based I\/O mapping between controller tags and DeviceNet nodes.\u003c\/p\u003e\n\u003cp\u003eDeviceNet transaction timing is constrained by network node count and bus arbitration cycles. Each configured device participates in producer\/consumer messaging or explicit messaging depending on connection configuration.\u003c\/p\u003e\n\u003cp\u003eBackplane throughput consumption is proportional to active I\/O assemblies and connection instance count, with deterministic update behavior enforced through ControlLogix task scheduling.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-DNB\/D support hot-swapping in an active ControlLogix chassis?\u003cbr\u003eA: Yes. The module supports chassis-level hot insertion. DeviceNet connections may require re-establishment after reinsertion.\u003c\/p\u003e\n\u003cp\u003eQ: What limits DeviceNet network performance on this module?\u003cbr\u003eA: Performance is limited by baud rate (125 \/ 250 \/ 500 kbps), node count (max 64), and bus arbitration timing.\u003c\/p\u003e\n\u003cp\u003eQ: Can multiple DeviceNet devices be controlled simultaneously?\u003cbr\u003eA: Yes. The module supports multiple simultaneous connections through cyclic I\/O and explicit messaging mechanisms.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInsert the module into a properly aligned 1756 ControlLogix chassis slot. Ensure full backplane connector engagement before energizing the system.\u003c\/p\u003e\n\u003cp\u003eUse shielded twisted-pair DeviceNet cable with correct 5-pin connector termination. Maintain shield continuity along the full trunk line with single-point grounding.\u003c\/p\u003e\n\u003cp\u003eVerify baud rate configuration across all network nodes before system startup. Mismatched baud settings will prevent node registration on the DeviceNet bus.\u003c\/p\u003e\n\u003cp\u003eRoute DeviceNet wiring away from high-current switching conductors to minimize electromagnetic coupling into low-voltage differential signaling lines.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43581196828762,"sku":"1756-DNB\/D","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-DNBD2.jpg?v=1782970866","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-dnb-d-devicenet-communication-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}