{"product_id":"allen-bradley-1756-en2txt-b-controllogix-ethernet-ip-communication-module","title":"Allen-Bradley 1756-EN2TXT\/B ControlLogix EtherNet\/IP Communication Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-EN2TXT\/B ControlLogix EtherNet\/IP 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-EN2TXT\/B\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-EN2TXT\/B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEtherNet\/IP communication module, operates as a dedicated high-speed bridge component for CIP packet routing within ControlLogix backplane networks.\u003cbr\u003eConfigured for deterministic Ethernet data exchange in ControlLogix chassis systems, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-EN2TXT\/B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-EN2TXT\/B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecommunication module) provides direct backplane-to-EtherNet\/IP transmission with embedded switching and redundancy-aware session handling.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e1756\u003c\/strong\u003e: ControlLogix chassis platform family\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEN2TXT\u003c\/strong\u003e: Dual-port EtherNet\/IP communication bridge with embedded switch architecture\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\/B\u003c\/strong\u003e: Hardware revision level indicating updated internal processing and firmware baseline compatibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\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-EN2TXT\/B\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 × 35 mm × 140 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e–40 deg C to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e~5.1 W (1 A at 5 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Type\u003c\/td\u003e\n\u003ctd\u003eEtherNet\/IP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePorts\u003c\/td\u003e\n\u003ctd\u003e2 × RJ45 Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed\u003c\/td\u003e\n\u003ctd\u003e10\/100 Mbps auto-negotiation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCIP Connections\u003c\/td\u003e\n\u003ctd\u003eUp to 128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Interface\u003c\/td\u003e\n\u003ctd\u003eControlLogix 1756 chassis bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Support\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eEtherNet\/IP Backplane Routing \u0026amp; Embedded Switch Deterministic Behavior\u003c\/h3\u003e\n\u003cp\u003eThe module executes CIP object routing between ControlLogix backplane tasks and external Ethernet nodes through an integrated dual-port switching fabric.\u003cbr\u003eBackplane communication is scheduled through chassis arbitration, ensuring deterministic delivery of Logix-class connections under mixed I\/O and messaging loads.\u003c\/p\u003e\n\u003cp\u003eEmbedded switch logic maintains frame forwarding between RJ45 ports without external switching hardware, enabling linear and star topology segmentation.\u003cbr\u003eRedundant controller configurations mirror connection tables at the CIP layer, with session reestablishment handled through backplane synchronization after failover events.\u003c\/p\u003e\n\u003cp\u003eFirmware revision \/B aligns internal processing timing with updated Logix stack behavior, reducing connection renegotiation latency during controller scan transitions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1756-EN2TXT\/B be hot-inserted into an energized ControlLogix chassis?\u003cbr\u003eA: Yes. The module supports hot-swap insertion. The backplane performs automatic module re-enumeration after slot detection.\u003c\/p\u003e\n\u003cp\u003eQ: What is the impact of Ethernet traffic on backplane current draw?\u003cbr\u003eA: The module maintains a fixed backplane load of approximately 1 A at 5 VDC. Network traffic does not modify power consumption.\u003c\/p\u003e\n\u003cp\u003eQ: How does redundancy affect CIP connection continuity?\u003cbr\u003eA: In redundant controller architectures, CIP sessions are replicated across controllers. Failover triggers automatic session rebind through backplane synchronization.\u003c\/p\u003e\n\u003chr\u003e\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInsert the module into a valid 1756 ControlLogix chassis slot with full backplane engagement. Improper seating can result in intermittent CIP communication loss or module fault states.\u003c\/p\u003e\n\u003cp\u003eUse shielded twisted-pair Cat 5 or higher Ethernet cabling. Ensure shield termination at the cabinet entry ground point to minimize EMI coupling into high-speed differential pairs.\u003c\/p\u003e\n\u003cp\u003eMaintain separation between Ethernet routing and high-current conductors such as motor drives or switching power lines. Cross at 90 degrees when unavoidable.\u003c\/p\u003e\n\u003cp\u003eVerify firmware alignment between controller, chassis, and communication module before commissioning. Mismatched revisions may cause connection table inconsistencies during runtime transitions.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43582057676890,"sku":"1756-EN2TXT\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-EN2TXT.jpg?v=1782975736","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-en2txt-b-controllogix-ethernet-ip-communication-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}