The construction of remote online access to PLC Laboratory based on Internet

摘要

This paper describes the construction of remote online access to PLC Laboratory based on Internet. The Laboratory apply industrial communication modules, relay on the powerful ommunications capabilities of Siemens PLC, transfer data by the Internet. The PLC of the Laboratory can be accessed by remote PC. The remote PC possible upload and download PLC program, online diagnosis, online monitoring, etc; and directly observed action of PLC by video, determine equipment movement is whether correct or error. The paper introduces the network topology, various functions and data security communication method of the system. With the development of the communication technology, the remote education has entered the stage of development depending on computer network. For PLC application technology, it is urgent to construct a remote training lab] to solve the PLC teaching problem. Then students can access school PLC training rooms by Internet remote online in any place, completing PLC program on the remote download, remote online debugging, remote online diagnosis, remote on-line modification and remote on-line monitoring and so on. At the same time, through camera real-time, observing PLC and work of training equipment. Building this kind of training platform, we need to solve data of remote sensing, data remote transmission and data transfer security problems.