The universal interface card EAM1680 can be used in the following situations: 1. The generator speed control board is a digital interface (commonly known as a computer), but load distribution and synchronization are analog systems (such as simulated LSM672 and SYC6714); 2. The generator speed control board is an analog interface, but the characteristics of the interface are unknown; 3. Unstable performance when using other interface cards 4. Can replace interface cards such as EAM100