Abstract: At present，the signal system of mine hoist in China usually consists of traditional relays and contactors，with low reliability.It easily breaks down.In view of the status quo of existing hoist signal system，a modern mine hoist signal system with Siemens programmable logic controller PLC-300 and remote I/O device ET200M is proposed.The communication network of this system is based on 485 PROFIBUS-DP network，and adopts ISD4004 voice module and LCD screen for playback to display the characters and broadcast the sounds.The redundant system greatly enhances the reliability，stability and security of the signal system，and significantly improves the work efficiency.With a friendly and intuitive interface，the mine hoist signal system has a certain reference value to the design of the hoist signal system in China.

Key words: PLC, PROFIBUS-DP, LCD display, Redundancy