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Glossary SCADA / Term

Device Read

OPC Client can issue a Device Read from the OPC Server. The OPC Server will understand that it should ignore the value it has in its cache (if any) and reply with a fresh value from its original data source. Consequently, a Device Read takes longer to complete than a Cache Read, but the value will be more recent.In OPC, a Device Read can either be a synchronous or asynchronous operation.

See also: Cache Read

Permanent link Device Read - Creation date 2020-09-12


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