{"product_id":"allen-bradley-1756-enet-a-ethernet-communication-module","title":"Allen-Bradley 1756-ENET\/A Ethernet Communication Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-ENET\/A Ethernet Communication Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eConfigured for Ethernet-based controller-to-device messaging in ControlLogix architectures, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-ENET\/A\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-ENET\/A\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEthernet communication module) provides direct physical and network-level execution for TCP\/IP communication over 10 Mbps industrial Ethernet within ControlLogix backplane systems.\u003c\/p\u003e\n\u003cp\u003eThis module operates as an early-generation Ethernet interface, bridging ControlLogix processors to standard Ethernet networks without full EtherNet\/IP object modeling. It is positioned as a discontinued communication component, superseded by higher-capacity ENBT and EN2T modules with extended connection handling and diagnostics.\u003c\/p\u003e\n\u003ch3\u003eHardware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-ENET\/A\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\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 @ 5.1 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Type\u003c\/td\u003e\n\u003ctd\u003eStandard Ethernet (non EtherNet\/IP object model)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003e10 Mbps (half\/full duplex)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eRJ-45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Interface\u003c\/td\u003e\n\u003ctd\u003eControlLogix 1756 backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Capacity\u003c\/td\u003e\n\u003ctd\u003eLimited TCP\/IP sessions vs ENBT\/EN2T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eControlLogix Backplane and Ethernet Deterministic Behavior\u003c\/h3\u003e\n\u003cp\u003eWithin the Allen-Bradley ControlLogix platform, the 1756-ENET\/A module integrates through backplane bus arbitration, sharing controller memory access with I\/O and communication modules. It supports early-stage Ethernet messaging but lacks modern EtherNet\/IP cyclic I\/O scheduling.\u003c\/p\u003e\n\u003cp\u003eBackplane communication is constrained by legacy firmware architecture, limiting simultaneous socket handling and deterministic network scheduling compared to later 1756-ENBT\/EN2T modules. Firmware execution does not support enhanced tag-based object modeling used in modern ControlLogix communication stacks.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-ENET\/A support EtherNet\/IP cyclic I\/O communication?\u003cbr\u003eA: No. It supports basic Ethernet TCP\/IP messaging only and does not implement full EtherNet\/IP object services.\u003c\/p\u003e\n\u003cp\u003eQ: Can the module be hot-swapped in a running ControlLogix chassis?\u003cbr\u003eA: Hot-swapping depends on system configuration and chassis rules. Backplane power must be managed according to ControlLogix slot power sequencing.\u003c\/p\u003e\n\u003cp\u003eQ: Is firmware upgrade available for extending functionality?\u003cbr\u003eA: No functional expansion is available. The module is discontinued and firmware is frozen at legacy revision levels.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module into a compatible 1756 ControlLogix chassis with power removed before insertion or removal unless system hot-swap is explicitly configured.\u003c\/p\u003e\n\u003cp\u003eEnsure RJ-45 Ethernet cabling complies with industrial shielding practices, including proper shield termination at cabinet ground reference points. Maintain separation between Ethernet cabling and high-voltage power conductors to reduce EMI coupling.\u003c\/p\u003e\n\u003cp\u003eBackplane slot alignment must be verified to avoid connector pin stress. Maintain ventilation clearance to ensure stable operation within 0 to 60 deg C ambient limits. Avoid bending stress on the RJ-45 connector during cable routing.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43585662746714,"sku":"1756-ENET\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-EN2TRB.jpg?v=1782973714","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-enet-a-ethernet-communication-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}