Abstract: According to the equipment supplier on the actual demand for equipment maintenance, this paper design a set of plastic extruder based on the remote monitoring system what exists on the basis of technology of PLC, Internet and VPN. While the long-distance equipment is requested technique service, this system in the equipment diagnosis center realizes remote monitoring and data acquisition fast through the internet. Therefore, the system improves post sale service and cuts down service cost. In this system, the response time of remote access was less than 1s, meeting equipment demands.

Key words: remote monitoring, plastic extruder, asymmetric digital subscriber line, virtual private network, programmable logic controller