{"product_id":"c76-uc300eth-multifunction-cnc-breakout-board-with-spindle-control-optoisolated-i-o","title":"C76 UC300ETH Multifunction CNC Breakout Board with Spindle Control \u0026 Optoisolated I\/O","description":"\u003cdiv style=\"max-width: 950px; margin: 0 auto; font-family: Arial, sans-serif; line-height: 1.6; color: #222;\"\u003e\n\n  \u003csection style=\"padding: 24px; border: 1px solid #e5e5e5; border-radius: 14px; margin-bottom: 22px; background: #fafafa;\"\u003e\n    \u003ch2 style=\"font-size: 26px; margin: 0 0 12px; color: #1f1f1f;\"\u003eC76 UC300ETH Multifunction CNC Breakout Board\u003c\/h2\u003e\n    \u003cp style=\"font-size: 16px; margin: 0;\"\u003e\n      The C76 UC300ETH Multifunction Board is a CNC breakout board designed to give full access to the UC300ETH Ethernet motion controller’s power, discrete signals, analog I\/O, spindle control, relay control, and safety monitoring features. It helps turn a UC300ETH-based control system into a cleaner, more organized, and easier-to-wire CNC control cabinet.\n    \u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border-left: 5px solid #f15a24; background: #fff7f3; border-radius: 10px; margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eQuick Answer\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWhat it is:\u003c\/strong\u003e A multifunction CNC breakout board for the UC300ETH Ethernet motion controller.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWhat it does:\u003c\/strong\u003e Breaks out UC300ETH signals into organized terminals for inputs, outputs, spindle control, relays, analog I\/O, and expansion wiring.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e CNC routers, CNC mills, CNC retrofits, and DIY CNC control cabinets using a UC300ETH-based motion control setup.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eImportant:\u003c\/strong\u003e This board is designed to work with the UC300ETH motion controller. The UC300ETH controller is not included unless purchased separately or as part of a bundle.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-bottom: 10px;\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-top: 0;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDesigned for UC300ETH motion control:\u003c\/strong\u003e Built specifically as a breakout and interface board for the UC300ETH Ethernet CNC motion controller.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003e5 ports for discrete signals:\u003c\/strong\u003e Emulates 5 ports for discrete CNC input and output signals.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAnalog I\/O access:\u003c\/strong\u003e Includes access to an analog port for expanded CNC control applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003e3 expansion ports:\u003c\/strong\u003e Includes 3 expansion ports for adding compatible breakout boards, relay boards, or C34-style connector boards.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePWM spindle speed control:\u003c\/strong\u003e Built-in PWM-based speed control helps support spindle control wiring in compatible CNC systems.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eBuilt-in relays:\u003c\/strong\u003e Includes two built-in electromechanical relays with normally open and normally closed positions for spindle control.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSafety and fault monitoring:\u003c\/strong\u003e Supports monitoring for E-stop, safety charge pump, driver fault, and VFD fault signals.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eC34 connector board compatibility:\u003c\/strong\u003e Compatible with the C34 connector board family for cleaner wiring to popular drives, including step, direction, fault, and enable signals.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eIndependent optoisolation:\u003c\/strong\u003e Independent optoisolation circuits help protect the CNC control system from electrical noise and signal issues.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eStatus LEDs:\u003c\/strong\u003e Input status LEDs make setup, diagnostics, and troubleshooting easier.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDIN rail mountable:\u003c\/strong\u003e Designed for organized CNC electrical enclosure and control cabinet installations.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border: 1px solid #ddd; border-radius: 14px; margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eWhy CNC Builders Use the C76\u003c\/h3\u003e\n    \u003cp style=\"margin-bottom: 12px;\"\u003e\n      The UC300ETH is a powerful Ethernet motion controller, but wiring a full CNC machine directly into a controller can become messy fast. The C76 makes the control system easier to build by organizing the motion controller’s signals into usable terminals, relay connections, expansion ports, and safety inputs.\n    \u003c\/p\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003eHelps reduce messy CNC cabinet wiring\u003c\/li\u003e\n      \u003cli\u003eMakes UC300ETH signal access easier to understand and service\u003c\/li\u003e\n      \u003cli\u003eSimplifies wiring for inputs, outputs, spindle control, relays, and drive signals\u003c\/li\u003e\n      \u003cli\u003eSupports a cleaner DIN rail control cabinet layout\u003c\/li\u003e\n      \u003cli\u003eImproves troubleshooting with visible status LEDs\u003c\/li\u003e\n      \u003cli\u003eHelps create a more professional CNC electronics installation\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-bottom: 10px;\"\u003eBest Applications\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-top: 0;\"\u003e\n      \u003cli\u003eUC300ETH CNC motion control systems\u003c\/li\u003e\n      \u003cli\u003eCNC router control cabinets\u003c\/li\u003e\n      \u003cli\u003eCNC mill electronics upgrades\u003c\/li\u003e\n      \u003cli\u003eCNC machine retrofit projects\u003c\/li\u003e\n      \u003cli\u003eDIY CNC machine builds\u003c\/li\u003e\n      \u003cli\u003eStepper driver and servo driver wiring setups\u003c\/li\u003e\n      \u003cli\u003eSpindle speed control and relay control systems\u003c\/li\u003e\n      \u003cli\u003eCNC systems that need E-stop, VFD fault, driver fault, and safety charge pump monitoring\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"background: #f5f5f5; padding: 22px; border-radius: 14px; margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eTechnical Highlights\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eController compatibility:\u003c\/strong\u003e Designed for the UC300ETH Ethernet motion controller.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSignal access:\u003c\/strong\u003e Emulates 5 ports for discrete signals and 1 port for analog signals.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eExpansion:\u003c\/strong\u003e 3 expansion ports for compatible add-on boards.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e Supports TTL or industrial-type open-collector inputs.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Supports TTL or industrial-type open-collector outputs.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePower terminal:\u003c\/strong\u003e 10-30VDC input for powering the board logic.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOutput level:\u003c\/strong\u003e +3.3VDC TTL outputs at 24mA.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 18 input ports.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSpindle control:\u003c\/strong\u003e Built-in PWM-based speed control and relay support.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSafety monitoring:\u003c\/strong\u003e E-stop, safety charge pump, driver fault, and VFD fault monitoring.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e DIN rail mountable for CNC control cabinet installation.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border: 1px solid #e5e5e5; border-radius: 14px; margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eSoftware and Control System Use\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003eThe C76 is used as the interface board between the UC300ETH motion controller and your CNC machine wiring.\u003c\/li\u003e\n      \u003cli\u003eCommon UC300ETH-based CNC setups may use UCCNC, Mach3, or Mach4 depending on the controller, license, plugin, and configuration.\u003c\/li\u003e\n      \u003cli\u003eAlways verify software compatibility, licensing, plugin requirements, and wiring configuration before installation.\u003c\/li\u003e\n      \u003cli\u003eReview the user manual before connecting drives, spindle control, limit switches, E-stop circuits, or VFD fault wiring.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border-left: 5px solid #222; background: #f9f9f9; border-radius: 10px; margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eCompatibility Note\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003eThis product is intended for CNC systems using the \u003cstrong\u003eUC300ETH Ethernet motion controller\u003c\/strong\u003e.\u003c\/li\u003e\n      \u003cli\u003eThis listing is for the C76 board only unless the product option clearly states otherwise.\u003c\/li\u003e\n      \u003cli\u003eThe UC300ETH controller, stepper drivers, servo drives, power supplies, spindle\/VFD hardware, switches, and wiring are sold separately unless stated otherwise.\u003c\/li\u003e\n      \u003cli\u003eConfirm your drive type, signal voltage, power supply, spindle\/VFD setup, and CNC software before ordering.\u003c\/li\u003e\n      \u003cli\u003eIf you are replacing an older breakout board, compare your required I\/O, relay, spindle, E-stop, and fault wiring before purchase.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border: 1px solid #ddd; border-radius: 14px; margin-bottom: 26px; background: #fff7f3;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eNeed the UC300ETH Controller Too?\u003c\/h3\u003e\n    \u003cp style=\"margin-bottom: 12px;\"\u003e\n      The C76 is designed to work with the UC300ETH Ethernet motion controller. If you are building a new UC300ETH-based CNC control system, the bundle is usually the better choice because it includes both the controller and the breakout board together.\n    \u003c\/p\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 16px;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eBetter for new builds:\u003c\/strong\u003e Includes the UC300ETH controller and C76 breakout board as a matched setup.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eCleaner control cabinet wiring:\u003c\/strong\u003e Gives you Ethernet motion control plus organized terminals, relays, spindle control, and optoisolated I\/O.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLess guesswork:\u003c\/strong\u003e Helps avoid buying the C76 board without the controller it is designed to work with.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003ca href=\"https:\/\/buildyourcnc.com\/products\/uc300eth-c76-ethernet-cnc-controller-bundle\" target=\"_blank\" rel=\"noopener\" style=\"display: inline-block; padding: 12px 18px; background: #f15a24; color: #fff; text-decoration: none; border-radius: 8px; font-weight: bold;\"\u003e\n      View the UC300ETH + C76 CNC Controller Bundle\n    \u003c\/a\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-bottom: 10px;\"\u003eWhat You Receive\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-top: 0;\"\u003e\n      \u003cli\u003eC76 UC300ETH Multifunction CNC Breakout Board\u003c\/li\u003e\n      \u003cli\u003eBuilt-in terminals and connections for CNC control cabinet wiring\u003c\/li\u003e\n      \u003cli\u003eAccess to discrete signals, analog I\/O, relay outputs, and spindle control features\u003c\/li\u003e\n      \u003cli\u003eDIN rail mountable board layout for organized enclosure installation\u003c\/li\u003e\n      \u003cli\u003eAccess to the user manual below for wiring and setup reference\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border: 1px solid #ddd; border-radius: 14px; background: #ffffff; margin-bottom: 26px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eDocuments\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003e\n        \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/7516\/3822\/files\/c76_rev4_user_manual_ver2.1.pdf?v=1779314625\" target=\"_blank\" rel=\"noopener\" style=\"color: #c9411d; font-weight: bold; text-decoration: none;\"\u003e\n          Download User Manual C76 Rev.4 v2.1\n        \u003c\/a\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"padding: 22px; border: 1px solid #e5e5e5; border-radius: 14px;\"\u003e\n    \u003ch3 style=\"font-size: 21px; margin-top: 0;\"\u003eBefore You Order\u003c\/h3\u003e\n    \u003cul style=\"padding-left: 22px; margin-bottom: 0;\"\u003e\n      \u003cli\u003eChoose this board if you already have a UC300ETH controller and need the matching multifunction breakout board.\u003c\/li\u003e\n      \u003cli\u003eChoose the UC300ETH + C76 bundle if you need both the Ethernet motion controller and the breakout board.\u003c\/li\u003e\n      \u003cli\u003eDo not buy it assuming it is a standalone CNC controller by itself. It is the breakout\/interface board for the UC300ETH control setup.\u003c\/li\u003e\n      \u003cli\u003eUse this board when you need organized I\/O, spindle control, relay control, optoisolated inputs, and cleaner cabinet wiring.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e","brand":"BuildYourCNC","offers":[{"title":"Default Title","offer_id":47889831755950,"sku":null,"price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/7516\/3822\/files\/C76_UC300ETH_Multifunction_CNC_Breakout_Board.jpg?v=1779315301","url":"https:\/\/buildyourcnc.com\/products\/c76-uc300eth-multifunction-cnc-breakout-board-with-spindle-control-optoisolated-i-o","provider":"BuildYourCNC","version":"1.0","type":"link"}