IDAS data processing

After receiving data from an I/O server, IDAS converts data values into storage data types, depending on the type of the tag associated with the value. For example, if the data value is associated with a floating point analog tag, the incoming value is converted to a floating point value before transmission to the Storage subsystem. However, no timestamp conversion is applied because both the I/O Servers and the AVEVA Historian Storage subsystem base time on Universal Time Coordinated (UTC).

In Historian 2017 and later versions, IDAS uses the HCAL infrastructure for data delivery to the Historian server. This means that the storage rules such as DELTA or CYCLIC are applied on the client side to reduce the network traffic.