1. Introduction
Workpiece turnover device is an important part of the automatic production line, workpiece turnover is
achieved well by using hydraulic control of the mechanical device[1]. PLC (Programmable Logic
Controller, referred to as PLC) is digital operation of electronic system designed for applications in
industrial environments. Integrating computer technology, automatic control technology and
communication technology, it becomes the core equipment to achieve stand-alone, workshops and factory automation