readAtTime
Read data from an OPC HDA server at specified times
Syntax
Description
reads data from the items defined by dObj
= readAtTime(hdaClient
,itmList
,timeStamps
)itmList
, from the OPC HDA Server
associated with client object hdaClient
, at the timestamps specified by
timeStamps
.
When no value exists for a specified timestamp, the server will interpolate a value from
the surrounding values to represent the value at that timestamp, and the
Quality
for that timestamp will include the
Interpolated
bit.
[
returns the itmList
,value
,quality
,timeStamp
]
= readAtTime(hdaClient
,itmList
,timeStamps
,dataType
)value
in the specified dataType
along with
the corresponding item ID, quality ID and
timestamp.
returns a structure containing the fields S
= readAtTime(hdaClient
,itmList
,timeStamps
,'struct')ItemID
,
Value
, Quality
and
TimeStamp
.
Examples
Input Arguments
Output Arguments
Version History
Introduced in R2015b