Abstract: Abstract:In fire protection water system of hydropower station, the traditional communication scheme is Modbus communication including one master station and multiple slave stations, and there is serious delay problem in this communication mode. A cascade PLC communication solution was proposed. The hardware and communication algorithm software were optimized and improved. The program period time of the central processing unit of PLC was decreased. The traffic rate and the response speed of the communication system were improved greatly.

Key words: Keywords:hydropower station, fire protection water system, programmable logic controller (PLC), communication, optimization