{"product_id":"beckhoff-el6688-ethercat-terminal-1-port-ieee-1588-communication-interface","title":"Beckhoff EL6688 EtherCAT Terminal 1-port IEEE 1588 Communication Interface","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eTime-synchronous communication across distributed systems is executed reliably by the \u003cstrong\u003eBeckhoff EL6688\u003c\/strong\u003e EtherCAT Terminal, which functions as a dedicated 1-port communication interface supporting the \u003cstrong\u003eIEEE 1588\/PTP\u003c\/strong\u003e (Precision Time Protocol) standard. This compact module acts as a high-precision bridge, enabling seamless synchronization between EtherCAT networks and external Ethernet-based systems either as a grandmaster or a slave clock. Integrating the \u003cstrong\u003eBeckhoff EL6688\u003c\/strong\u003e into your control architecture provides the physical and protocol interface necessary to keep real-time industrial cycles aligned within sub-microsecond margins, functioning directly as a reference clock within the TwinCAT software ecosystem.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Protocol Compatibility:\u003c\/strong\u003e Fully supports both PTPv1 (IEEE 1588-2002) and PTPv2 (IEEE 1588-2008) specifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Clock Status:\u003c\/strong\u003e Configurable dynamically to operate in Master or Slave mode.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRobust Physical layer:\u003c\/strong\u003e Features a single 10BASE-T\/100BASE-TX RJ45 Ethernet port with auto-negotiation and auto-crossing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDistributed Clocks (DC):\u003c\/strong\u003e Integrated Distributed Clocks capability for microsecond-level synchronization precision.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical Isolation:\u003c\/strong\u003e Certified galvanic isolation up to 500 V between the internal E-bus circuitry and the external Ethernet network.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003eSynchronization of geographically dispersed PLC and motion control architectures.\u003c\/li\u003e\n  \u003cli\u003eIntegration of test bench monitoring equipment with microsecond-accurate timestamp requirements.\u003c\/li\u003e\n  \u003cli\u003eSubstation and power generation distribution system monitoring (IEEE 1588 network synchronization).\u003c\/li\u003e\n  \u003cli\u003eMulti-axis coordinated motion control across isolated network boundaries.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; font-family: inherit;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold; width: 35%;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eBeckhoff Automation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eModel \/ Article Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eEL6688\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eBus System\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eEtherCAT (E-bus connection)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eEthernet Port Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e1 x RJ45 (10BASE-T\/100BASE-TX)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eData Transfer Speed\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e10\/100 Mbit\/s (IEEE 802.3u Auto-Negotiation, half\/full duplex)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eSupported Protocol\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003ePTPv1 (IEEE 1588-2002), PTPv2 (IEEE 1588-2008)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eDistributed Clocks (DC)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eYes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eCurrent Consumption (E-bus)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eTypical 310 mA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eElectrical Isolation\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e500 V (E-bus to Ethernet interface)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eDiagnostic Indicators\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eLink\/Activity LED, Status LEDs (Run, Error, PTP Status)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0 degC to +55 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eStorage Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e-25 degC to +85 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eRelative Humidity\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e95%, non-condensing\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eHousing Material\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003ePolycarbonate\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eDimensions (W x H x D)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e24 mm x 100 mm x 52 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eMounting Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e35 mm DIN rail (EN 60715) with locking tab\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eProtection Rating\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eIP20\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eApprovals\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCE, UL, ATEX (II 3 G Ex nA IIC T4 Gc)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4 style=\"color: #1a365d; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe EL6688 is uniquely optimized for PTP time synchronization. If you require standard TCP\/IP Ethernet communication bypass without high-precision sub-microsecond synchronization protocols, the EL6601 or EL6614 terminals should be used instead. For bridging time systems between two completely isolated EtherCAT networks, consider pairing the EL6688 with an EL6692 or EL6695 EtherCAT bridge terminal.\u003c\/p\u003e\n\n\u003ch4 style=\"color: #1a365d; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWith a high E-bus current consumption of 310 mA typical, systemic integration requires a close audit of your current coupler's power budget (such as an EK1100). If multiple high-draw modules reside in the same physical slice segment, you must deploy an EL9410 power supply terminal immediately upstream to avoid bus communication instability or system resets under heavy traffic loads.\u003c\/p\u003e\n\n\u003ch4 style=\"color: #1a365d; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eTo ensure the maximum phase accuracy of the IEEE 1588 protocol, avoid using daisy-chained unmanaged switches between the master clock and the EL6688 RJ45 interface. Standard unmanaged switches introduce unpredictable packet jitter which degrades the accuracy of the PTP sync mechanism. Always use high-quality Cat.5e or Cat.6 shielded cables to isolate synchronization packets from high-frequency EMC field noise.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 1rem; margin-bottom: 1.5rem; border-radius: 4px;\"\u003e\n  \u003cp style=\"color: #9b2c2c; font-weight: bold; margin: 0 0 0.5rem 0;\"\u003eCRITICAL WARNING\u003c\/p\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0; font-size: 0.95rem;\"\u003eAlways isolate all electrical power systems prior to installation, removal, or terminal replacement. Do not hot-swap the terminal while the bus segment is active. Failure to fully power down the bus segment can cause immediate damage to internal E-bus components or communication loss on the downstream nodes.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold;\"\u003e1\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eAlign the terminal side-by-side with the adjacent coupler or terminal module using the guide slots on the housing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold;\"\u003e2\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003ePress the EL6688 firmly onto the standard 35 mm DIN rail until the locking tab engages securely with a tactile click.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold;\"\u003e3\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eConnect a shielded Ethernet cable to the front RJ45 port and verify the mechanical lock clicks into position.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; min-width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold;\"\u003e4\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eConfigure the TwinCAT system manager to recognize the PTP configuration parameters (master or slave role selection).\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106460197227,"sku":"EL6688","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/el6688-4rhexdebjs4.png?v=1776244554","url":"https:\/\/www.plcprotech.com\/products\/beckhoff-el6688-ethercat-terminal-1-port-ieee-1588-communication-interface","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}