{"product_id":"abb-asto-21c-safe-torque-off-interface-board-acs800","title":"ABB ASTO-21C Safe Torque Off Interface Board ACS800","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe ABB ASTO-21C is a Safe Torque Off (STO) interface board for ACS800 drive systems. It implements dual-channel STO logic that disables torque-generating capability by inhibiting the inverter gate drive signals without disconnecting the main power, supporting safety functions such as emergency stop and prevention of unexpected start-up.\u003c\/p\u003e\n\u003ch3\u003eCore Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: Safe Torque Off (STO) interface board\u003c\/li\u003e\n\u003cli\u003eCompatible drives: ACS800 series (R7i–R8i frames class)\u003c\/li\u003e\n\u003cli\u003eSupply: 24 V DC ±10%\u003c\/li\u003e\n\u003cli\u003eCurrent consumption: Approx. 40 mA (20 mA per channel)\u003c\/li\u003e\n\u003cli\u003eLogic levels: “0” \u0026lt; 5 V DC, “1” \u0026gt; 17 V DC\u003c\/li\u003e\n\u003cli\u003eMax cable length: Up to 300 m (shielded twisted pair)\u003c\/li\u003e\n\u003cli\u003eAmbient temperature: 0…50 °C\u003c\/li\u003e\n\u003cli\u003eOption association: ACS800 +Q967 STO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDual-channel STO hardware disable\u003c\/li\u003e\n\u003cli\u003eRemoves torque without main power disconnection\u003c\/li\u003e\n\u003cli\u003eSupports emergency stop and prevention of unexpected start-up\u003c\/li\u003e\n\u003cli\u003eDesigned for ACS800 high-power frames\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction?\u003c\/strong\u003e Safe Torque Off interface board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrives?\u003c\/strong\u003e ACS800 R7i–R8i class.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply?\u003c\/strong\u003e 24 V DC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003ePower down the ACS800 drive completely.\u003c\/li\u003e\n\u003cli\u003eInstall the ASTO-21C in the designated position according to the STO hardware manual.\u003c\/li\u003e\n\u003cli\u003eConnect the dual-channel STO control wiring (shielded twisted pair).\u003c\/li\u003e\n\u003cli\u003eConfigure the STO parameters and safety logic.\u003c\/li\u003e\n\u003cli\u003ePerform functional safety validation and commissioning checks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm frame size compatibility (R7i–R8i class).\u003c\/li\u003e\n\u003cli\u003eRequired for ACS800 drives equipped with the +Q967 STO option.\u003c\/li\u003e\n\u003cli\u003eCritical spare for STO-enabled ACS800 installations.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":67661596786755,"sku":"ASTO-21C","price":225.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/5810\/3107\/files\/ASTO-21C_0.png?v=1791536060","url":"https:\/\/www.plcdcspro.com\/products\/abb-asto-21c-safe-torque-off-interface-board-acs800","provider":"PLC DCS Pro Ltd.","version":"1.0","type":"link"}