This paper exploits marine central cooling water control system based on PID tune and PWM def- erent of S7-200 PLC utilizing technology of SEIMENS up to the minute,implements its basic function via pro- gram.

• 本文利用西门子最新技术开发基于S7-200PLC的自整定PID和PWM输出的船舶中央冷却水控制系统,通过程序实现其基本功能。