Designation of Depth Measurement System

Because the housing depth measurement device used in current automobile horn production has lots of defects such as low efficiency,low precision and difficulty to fit with automatic production line,a new depth measurement system is designed,which integrated the PLC,HMI and digital display unit. This paper gives a detail description to this system about the hardware constitution,software programming,realization of communication between hardware and HMI design. In practice,it is proved that this depth measurement system is reliable in operation. It can improve the measurement efficiency by more than 40% and its measurement accuracy can reach 99.8%. This system completely fulfills the requirement of housing depth measurement in production of automobile horn on automatic production line.