The control system base on fieldbus is introduced.The shaping process and the function of software is described.And the hydraulic servo synchronization control and PID control is also discussed.

• 设计了基于现场总线技术的控制系统，描述了打捆机的工作流程以及监控软件的功能，讨论了液压伺服系统的PID控制和同步控制。