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Frequently Asked Questions

What is a historian in SCADA?

A "historian", is a software service within the HMI which accumulates time-stamped data, events, and alarms in a database which can be queried or used to populate graphic trends in the HMI. The historian is a client that requests data from a data acquisition server. An important part of most SCADA implementations is alarm handling.

What data does The VTScada historical data viewer display?

The VTScada Historical Data Viewer displays continuous real-time and historical data. VTScada’s ODBC Server and OPC Client/Server allow you to share data with third-party software.

What determines how much data can be stored in SCADA?

The hard drive space determines how much data can be stored and for how long, while the processing power determines how many data points the historian can handle. Each networked device or piece of equipment at a solar PV site has data points (also called tags) that the SCADA system pulls data from and the historian logs and stores.

How is the data stored in a historian system?

In most cases, the data is stored long-term through a third-party, cloud-based historian platform. The data can be stored onsite for short-term periods, usually a week or two, as opposed to a full local historian that can store multiple years of data. How might the historian data be used differently for a DAS system as opposed to a SCADA system?


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