1. Wang, S., Xu, H.: Aplication of PLC in Manipulator. Journal of Changchun Insititute of Technology: Natural Science Edition (3), 45–48 (2008)
2. Gong, W., Hu, Q.: The Design of Manipulator PLC control system. Mechanical and Electrical Engineering Techhnology (11), 91–95 (2008)
3. Cai, W.: The Application of Human-computer Interface and PLC in Material Sorting System. Journal of Zhejiang Industry and Trade Polytechnic (3), 25–28 (2008)
4. Li, Y.: The Application of Step Motor Control in Industrial Manipulator Based on PLC. Science and Technology Information (18), 30–31 (2008)