refresh | Read all active items in group |
start | Start a logging task |
stop | Stop a logging task |
wait | Suspend MATLAB execution until object stops logging |
flushdata | Remove all logged data records associated with dagroup object |
getdata | Retrieve logged records from OPC Toolbox engine to MATLAB workspace |
peekdata | Preview most recently acquired data |
opcread | Read logged records from disk to MATLAB workspace |
opcstruct2array | Convert OPC data from structure to array format |
opcstruct2timeseries | Convert OPC data from structure to time series format |
Active | Group or item activation state |
DeadbandPercent | Percentage change in item value that causes subscription callback |
LogFileName | Name of disk file to which logged data is written |
Logging | Status of data logging |
LoggingMode | Specify destination for logged data |
LogToDiskMode | Method of disk file handling for logged data |
RecordsAcquired | Number of records acquired |
RecordsAvailable | Number of records available in OPC Toolbox engine |
RecordsToAcquire | Number of records to acquire for logging session |
Subscription | Enable server update when data changes |
UpdateRate | Rate, in seconds, at which subscription callbacks occur |
Describes how to log data from an OPC server for later analysis and/or visualization.
Data Change Events and Subscription
Describes how OPC servers generate data change events, and how you can control data change event notification.