OPC-HDA read raw (HistoryEvent) with boundaries

[Former Member]

Hi,

we would like to query an OPC historian via read raw with option "get bounds". Can this be done with MII?

Regards,

Matt

[Former Member]

HI,

and being on UDS ... I am asking for implementation of the "get bounds" functionality (configurable) on the HistoryEvent mode. What's this all about? Say you want to retrieve the raw values from an historian. For this you use a

scheduled TX in MII on a regular base which retrieves raw values in the interval now-10s. Now the case where the

suspected value did change the last time 2h ago. The result? Nothing or "N/A". Because the requested time interval

does not include the last value. Things change when setting "get bounds" to true. Then the last value will be returned!

Any chance to have such a feature implemented without an OSS call?

Thanks a lot and best regards,

Matt

Edited by: Matthias Wald on Oct 12, 2010 7:39 PM