{"product_id":"allen-bradley-1756-en3tr-controllogix-ethernet-communication-module","title":"Allen-Bradley 1756-EN3TR ControlLogix Ethernet Communication Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-EN3TR ControlLogix Ethernet 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-EN3TR\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-EN3TR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEthernet Communication Module, operates as a dedicated hardware component for Ethernet\/IP data bridging and backplane-to-network packet routing within ControlLogix chassis architectures.\u003c\/p\u003e\n\u003cp\u003eConfigured for deterministic industrial Ethernet communication in ControlLogix platforms, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-EN3TR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-EN3TR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecommunication module) provides direct physical and protocol-level execution of Ethernet\/IP frame handling through dual RJ45 interfaces and a USB service channel, enabling multi-topology network integration including Device Level Ring (DLR) and linear structures.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo formal suffix segmentation is defined for 1756-EN3TR. The model identifier represents a fixed ControlLogix Ethernet communication module designation.\u003c\/p\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-EN3TR\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\u003e0.45 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e1 slot width ControlLogix module\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\u003e5.1 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eEthernet Communication Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthernet Ports\u003c\/td\u003e\n\u003ctd\u003e2 x RJ45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthernet Speed\u003c\/td\u003e\n\u003ctd\u003e10 \/ 100 Mbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB Port\u003c\/td\u003e\n\u003ctd\u003e1 x USB (12 Mbps)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e1 A at 5.1 VDC; 3 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e17.4 BTU\/hr\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e1756 Chassis (any slot)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTopologies\u003c\/td\u003e\n\u003ctd\u003eLinear, Device Level Ring (DLR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotion Support\u003c\/td\u003e\n\u003ctd\u003eUp to 128 axes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eOpen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity \u0026amp; EtherNet\/IP Deterministic Network Behavior\u003c\/h3\u003e\n\u003cp\u003eWithin ControlLogix architectures, the 1756-EN3TR participates in high-speed backplane arbitration where cyclic data is mapped between CPU task scheduling and Ethernet\/IP stack execution layers. The module maintains deterministic packet scheduling across dual-port switching logic, enabling ring redundancy via DLR topology without external switch dependency. I\/O density scaling and connection handling are constrained by backplane bandwidth allocation (1 A at 5.1 VDC), where communication throughput is synchronized with chassis scan cycles and motion control task execution up to 128 axis coordination.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1756-EN3TR operate in Device Level Ring (DLR) mode without external switches?\u003cbr\u003eA: Yes. DLR is internally supported through embedded ring logic, allowing fault-tolerant Ethernet topology without external switching hardware.\u003c\/p\u003e\n\u003cp\u003eQ: What is the effect of backplane current loading on module communication performance?\u003cbr\u003eA: The module draws 1 A at 5.1 VDC from the backplane. Excess chassis loading can affect available slot power but does not directly alter Ethernet throughput timing.\u003c\/p\u003e\n\u003cp\u003eQ: Does the USB port affect Ethernet\/IP communication cycles?\u003cbr\u003eA: No. The USB interface operates at 12 Mbps as a service channel and is logically isolated from Ethernet\/IP cyclic data processing.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eThe module must be inserted into a powered-down 1756 chassis to ensure correct backplane connector engagement. Slot alignment must remain perpendicular to prevent pin shear across high-density backplane contacts. Ethernet cabling should maintain separation from high-noise power conductors to reduce induced jitter in RJ45 signaling lines. Shield termination should be referenced at a single enclosure ground point. USB service connections should be used only for configuration and diagnostics, not continuous runtime communication.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43585441235034,"sku":"1756-EN3TR","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-EN3TR2.jpg?v=1783050252","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-en3tr-controllogix-ethernet-communication-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}