Patent ID: 7328372
Filing Date: 2008-02-05
Classification: G05B,G06F

Abstract:
1. A process data collection system comprising: two real servers accessible to process data in common; a means for switching over said two real servers, one to a real control server and the other to a real standby server; a virtual server which gives access data in said real control server to a client; and a monitoring means outside the two real servers for performing switch-over which enables said real control server to access said process data by making said real control server active, and stops said real standby server from accessing said process data by making said real standby server inactive, wherein data items collected by said client are grouped at every data collection period and registered to said virtual server and said two real servers; data items specified for periodic collection are registered to a common database in said virtual server as well as registered in said two real servers as a common group; data items registered as a common group in said two real servers are updated via a cache buffer provided in each of said real servers; and said common database in said virtual server is updated with data in the cache buffer provided in said real control server as well as given to said client via a cache buffer provided in said virtual server.