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In order to solve the problems of transporting the welding parts to the work place by means of manual trolleys, in a factory which manufactured large steel structure, a transport vehicle calling system was designed. The system could transfer the welding parts to the positions automatically and effectively. Based on PLC core control technology, the software and hardware of the control system were designed. The electrical control system schematic and PLC interface address allocation table were designed. The calculation method in the limit current resistance of the seven segment digital tube was analyzed by examples. The main components of the system detail table were provided. A flow chart of the main program and the related functions programs were included. The requests of the software function test could get by the touch screen simulation. And after it was passed by the site installation, then was produced. The research results show; the control system fully meets the control requirements. It is stable and reliable, flexible and convenient to control. It can improve the production effectively. [ABSTRACT FROM AUTHOR]