Equipment based on VPN (Virtual Private Network) technology and method and system for remotely maintaining PLC (Programmable Logic Controller)

The invention provides equipment based on a VPN (Virtual Private Network) technology and a method and system for remotely maintaining a PLC (Programmable Logic Controller). The method comprises the following steps of: configuring a VPN remote network comprising a computer network, a VPN router and a VPN network; based on a VPN remote network, the PLC operation state is monitored, and PLC operation state data is obtained; a data storage library constructed by using configuration software is used for storing PLC operation state data; and performing remote maintenance on the PLC according to abnormal data in the PLC operation state data. According to the method, remote debugging and program uploading and downloading cannot be carried out on the remote PLC controller by utilizing the equipment of the VPN technology, so that the maintenance efficiency of the PLC is effectively improved. 本发明提供一种基于VPN技术的设备及远程维护PLC的方法和系统，其方法包括：配置包括计算机网络、VPN路由器、VPN组网的VPN远程网络；基于VPN远程网络，对PLC运行状态进行监控，获取PLC运行状态数据；利用组态软件构建的数据存储库，存储PLC运行状态数