Abstract: An event historian system stores an event data dictionary. The system receives an initial query from a client device on a network connection and responds by providing the event data dictionary information to the client device. The client device sends another query requesting data values which are defined in the event data dictionary. The system responds to the second query by sending results comprising the requested data values to the client system over the network connection.

Abstract: A system for displaying statistical data in a process control environment. A client device connects, via a network, to a historian connection module, and subscribes, via the connection to the historian connection module, to statistical data stored in a historian server module. A historian device receives a connection, by the historian connection module via the network, from the client device, forms a connection between the historian connection module and the historian server module, receives a subscription, by the historian connection module via the network, to statistical data stored in the historian server module from the client device, and stores, by the historian connection module, the received subscription.

Abstract: A system for communicating data packets in a process control environment is described. A client device connects, via the network, to an historian device, creates, via a first dictionary manager module, a first tag dictionary, synchronizes, via the network, the first tag dictionary with a second tag dictionary created by the historian device, optimizes a packet via a packet optimization layer comprising scanning a tag ID present in the packet, determines a matching tag handle for the tag ID from the first tag dictionary, replaces each instance of the tag ID in the packet with the matching tag handle, and sends the optimized packet to the historian device via the network.

Abstract: An event historian system receives event data from a client system via a network connection and stores the event data in a block data storage system. An event data block in which to store the received event data is selected based on the time range of the occurrence of the received event data. The received event data is stored in a snapshot within the event data block. Event property data is extracted from the received event data and used to build a plurality of event property index files.