Aim\ To design a control system of automatic levelling
and meet the needed accuracy in need. Method\ An automatic levelling system designed with SIMATIC S7300 control device of SIEMENS as mastercontrol device
the hardwares of the system
and its corresponding softwares are described. Results\ Through experiment
it is proved to be able to satisfy the expected control goal. Conclusion\ The control plan can be widely applied to different kinds of levelling system.