Early warning function: PLC (fx2n-3

Early warning function: PLC (fx2n-32mt) starts to start, internal bit M100 triggers output bit Y0 (K3), turns on bell control relay KA3 circuit, KA3 is closed, bell circuit is connected, and the bell makes a sound; after 10 seconds of early warning, it automatically changes to an early warning that rings for 2.5 seconds and stops for 2.5 seconds, until the starting process of the ground belt conveyor is finished. This function consists of internal bits M7, M8 and timer T7 (2.5 seconds) and T8 (2.5 seconds) are completed, the internal bit M8 triggers the output bit Y0 (K3); the bell control relay KA3 circuit is connected, KA3 is closed, the bell circuit is connected, and the bell sounds;