Abstract: A system for lossless sequence of events data streaming in a scan based process control system is provided. The system comprises a digital interface component, the digital interface component configured to receive a plurality of sequence of events data collected during one scan period, to produce a sequence of events data buffer comprising a plurality of sequence of events data, and to make the sequence of events data buffer available to at least one system component. The digital interface component comprises a storage component, the storage component configured to store a sequence of events data buffer. The system further comprises a processing component that accesses the sequence of events data from the storage component and processes the sequence of events data.

Abstract: A system for lossless sequence of events data streaming in a scan based process control system is provided. The system comprises a digital interface component, the digital interface component configured to receive a plurality of sequence of events data collected during one scan period, to produce a sequence of events data buffer comprising a plurality of sequence of events data, and to make the sequence of events data buffer available to at least one system component. The digital interface component comprises a storage component, the storage component configured to store a sequence of events data buffer. The system further comprises a processing component that accesses the sequence of events data from the storage component and processes the sequence of events data.

Abstract: A data acquisition service on a network node is disclosed for forwarding received process data to a process history database over a potentially slow and/or intermittent network connection. A store and forward functionality within the networked node receives incoming process data via a first network interface and forwards outgoing process data via a second network interface. The disclosed store and forward functionality includes an immediate transmission cache and a store and forward storage. The store control enters, in response to detecting an entry condition, an activated mode wherein incoming process data is directed to the store and forward storage. A read control forwards outgoing process data to the second network interface from the immediate transmission cache and store and forward storage. The read control includes at least a first configurable parameter that constrains a rate at which data retrieved from the store and forward storage is forwarded via the second network interface.

Abstract: A control system database server is disclosed that includes a data compression facility that implements a compression test sequence on streams of time stamped data points rendered by components of a control system. A deadband/time override is incorporated into the compression test sequence to ensure that a previously received data point, within the stream of received data points, is saved within a designated time period even if the compression test sequence would have determined that the data point be discarded. The series of compressed/tabled data points, corresponding to the received steams of data points, are thereafter provided by the historian to requesting client applications that, by way of example, retrieve the compressed, time stamped data point streams for the purpose of constructing and displaying trend graphs.

Abstract: Disclosed is a data collection and retrieval system that puts data produced by real-time and non-real-time data sources into parallel “streams” or data files. Real-time data points are stored with time stamps in data files and non-real-time data points with time stamps are stored in other data files. Real-time data points are stamped with the times at which their data were collected. Non-real-time data points are stored in time-sequential order, the sequence time being the time of relevance rather than the time of collection. By referencing the streams that contain data points relevant to a given period, header files facilitate coordinated retrieval of data from multiple parallel streams. The time stamps allow the data points to be merged together into one coordinated, time-sequential data stream for analysis. The parallel stream data collection and retrieval technique allows operators to add or delete data sources without shutting down the process being monitored.

Abstract: Disclosed is a data collection and retrieval system that puts data produced by real-time and non-real-time data sources into parallel “streams” or data files. Real-time data points are stored with time stamps in data files and non-real-time data points with time stamps are stored in other data files. Real-time data points are stamped with the times at which their data were collected. Non-real-time data points are stored in time-sequential order, the sequence time being the time of relevance rather than the time of collection. By referencing the streams that contain data points relevant to a given period, header files facilitate coordinated retrieval of data from multiple parallel streams. The time stamps allow the data points to be merged together into one coordinated, time-sequential data stream for analysis. The parallel stream data collection and retrieval technique allows operators to add or delete data sources without shutting down the process being monitored.