Development of a remote experimental teaching system for PLC devices

In order to meet the requirement of remote dynamic authorization access to experimental equipment in the Mitsubishi Electric Automation Laboratory of Tianjin University, an online remote experimental teaching system has been designed and developed. The system mainly consists of two parts, one is the reservation management subsystem of experimental equipment based on LAMP architecture, and the other is the programmable VPN subsystem based on OCServ. The main functions of the experimental equipment reservation management subsystem include experimental resource information, available resource display, reservation management, reservation approval, history query, and so on. The programmable VPN subsystem can dynamically add and delete VPN users in batch according to the reservation of experimental equipment, and realize remote dynamic authorization access to the equipment. With the help of this system, universities in Tianjin can share the laboratory equipment and improve the utilization rate of the laboratory equipment. The system solves the problem of remote security communication control over the Internet by VPN technology, and is suitable for all experimental equipment using IP protocol to communicate.