Abstract: Oil pressure unit is one of the most significant auxiliary equipment in hydraulic power plant. Taking the M218 series PLC(Programmable Logic Controller) produced by Schneider company as an example, we introduce the system’s automatic control functions and the process in detail. M218 embodies Schneider’s concept of Flexible Equipment Control, and the control system has high reliability and stability.

Key words: PLC M218, oil pressure unit, automatic air inflation, soft starter