You can create an OPC Deadband for the entire Logging Group by entering a value in the OPC Deadband field under that Group's tab in the Canary Logger Administrator.
To use OPC Deadbanding, the OPC Server must support percent dead banding, some do not. The OPC server dead banding is defined as a percent dead banding and covers the entire group level. The definition of the OPC server dead banding can be found in the OPC 2.0 specification at section 126.96.36.199. At the group level in the Canary Logger, the dead band percent number (between 0.0 and 1.0) is passed to the OPC server. Again, not all OPC servers support percent dead banding, since this is an optional behavior. If available, this dead banding is the most efficient because it reduces the amount of data that needs to be communicated to the Canary Logger.
You can see in the above example that a value of ".10" or 10% has been entered in the OPC Deadband field. This means the logging session will omit any value that does not change by more than 10% of the previous value.