Abstract:FF bus instrument is currently the most popular bus-type intelligent instrument in the world. Compared with traditional intelligent instrument, it has internal functions such as PID control, logic operation and self-diagnosis. It greatly facilitates the user's on-site application and troubleshooting. This article mainly introduces the application process of FF bus instrument in the DeltaV DCS system of copper smelting project, and how to use AMS equipment management system to manage FF instrument and deal with equipment failure.