{"product_id":"allen-bradley-1756-dhrio-e-controllogix-communication-module","title":"Allen Bradley 1756-DHRIO\/E ControlLogix Communication Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen Bradley 1756-DHRIO\/E ControlLogix 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-DHRIO\/E\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-DHRIO\/E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecommunication module, serves as a dedicated hardware component for DH+ message routing and Remote I\/O scan execution within ControlLogix backplane-based ControlLogix chassis systems.\u003c\/p\u003e\n\u003cp\u003eConfigured for dual-protocol legacy network integration in ControlLogix platforms, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen Bradley 1756-DHRIO\/E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-DHRIO\/E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecommunication module) provides direct physical and logical execution of DH+ and RIO data exchange across ControlLogix controllers and legacy PLC networks.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo functional suffix segmentation beyond the base ordering code\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-DHRIO\/E\u003c\/strong\u003e. The “\/E” designation does not introduce configurable hardware variants within the provided specification set.\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-DHRIO\/E\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\u003ePowered via ControlLogix backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Networks\u003c\/td\u003e\n\u003ctd\u003eDH+ \/ RIO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDH+ Baud Rates\u003c\/td\u003e\n\u003ctd\u003e57.6 \/ 115.2 \/ 230.4 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRIO Baud Rates\u003c\/td\u003e\n\u003ctd\u003e57.6 \/ 115.2 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax DH+ Nodes\u003c\/td\u003e\n\u003ctd\u003e64 devices\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax RIO Nodes\u003c\/td\u003e\n\u003ctd\u003e32 devices\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003e3-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 Deterministic Legacy Network Bridging (ControlLogix DH+ \/ RIO Layer)\u003c\/h3\u003e\n\u003cp\u003eThe 1756-DHRIO\/E executes protocol bridging between ControlLogix backplane scan cycles and legacy serial network timing domains. DH+ and RIO channels operate as independent deterministic communication engines mapped to fixed baud configurations.\u003c\/p\u003e\n\u003cp\u003eBackplane transactions are scheduled through ControlLogix chassis arbitration, while DH+ frame transmission follows token-based bus access rules. RIO scan execution maintains cyclic polling aligned with fixed rack and block transfer tables.\u003c\/p\u003e\n\u003cp\u003eSignal timing resolution is constrained by baud rate selection and network node density, directly affecting update cycle latency across multi-drop configurations.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-DHRIO\/E support hot-swapping in a live ControlLogix chassis?\u003cbr\u003eA: Yes. The module supports chassis-level hot-swap. DH+ and RIO sessions may reset during reinsertion and require network reinitialization.\u003c\/p\u003e\n\u003cp\u003eQ: What limits DH+ and RIO communication performance?\u003cbr\u003eA: Performance is limited by configured baud rate, node count, and token rotation timing on DH+ plus cyclic scan intervals on RIO.\u003c\/p\u003e\n\u003cp\u003eQ: Can DH+ and RIO channels operate simultaneously?\u003cbr\u003eA: Yes. The module implements dual independent communication channels, allowing concurrent DH+ and RIO operation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInsert the module into a ControlLogix 1756 chassis slot with backplane alignment verified. Ensure full connector engagement before powering the chassis.\u003c\/p\u003e\n\u003cp\u003eUse shielded twisted-pair cabling for DH+ and RIO networks. Maintain continuous shield integrity and implement single-point grounding to reduce common-mode noise coupling.\u003c\/p\u003e\n\u003cp\u003eConfigure baud rate switches prior to energization. Mismatch between node configuration and module settings will prevent network synchronization.\u003c\/p\u003e\n\u003cp\u003eAvoid routing DH+\/RIO cabling parallel to high-current switching conductors to limit induced interference on legacy serial lines.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43581192241242,"sku":"1756-DHRIO\/E","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-DHRIO1.jpg?v=1782963720","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-dhrio-e-controllogix-communication-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}