1 The power supply of the fire alarm controller is divided into host power supply, external control power supply, host standby power supply and external control power supply standby power supply; 2 The main engine power supply should be directly connected with the fire power supply. It is forbidden to use the power plug, and the main power supply should be clearly marked. The external control power supply is also directly connected to the fire power supply like the host power supply; 3. The 24V voltage required by fire alarm system components and linkage devices is led out from the external control power supply; The standby batteries of the host and the external control power supply are respectively connected in series with the terminals of the main power supply and the external control power supply.