3.16.3.13. Tunnel (Push)
From the Edit Historian Connection window you can select Tunnel (Push).
The Tunnel (Push) historian type allows you to configure the DataHub instance as a tunnel slave to forward data from a local external historian to a remote external historian, by connecting to a DataHub tunnel master running on the remote machine. Please see External Historian 4 - Tunnel (Push) for more details.
Connection Settings
- Label
A unique text string used to identify this connection. This label is used to identify the connection when configuring store and forward, and to create the database name or retention policy in some historians. The label can contain only letters, numbers and the underscore (
_) character.- Tunnel connection name
The connection name of the tunnel you have configured to push data to the remote DataHub instance. See Tunnel (Push) in the the tutorial for more information.
- Remote historian label
The Label configured for the external historian on the remote side.
- Accumulation time (ms)
The number of milliseconds that the DataHub instance will buffer data in memory before pushing it across the tunnel. Leaving this field blank means that no accumulation time will be enforced. If both this value and Maximum # of buffered values (below) are specified, then the DataHub instance will send all buffered values across the tunnel whenever the first of these two limits is reached.
- Maximum # of buffered values
The maximum number of values that the DataHub instance will buffer in memory before pushing them across the tunnel. Leaving this field blank means that no values will be buffered.
- Log writes at information level
Checking this option causes messages regarding successful writes to the database to be logged at the level in the DataHub Event Log. If this is not checked then these messages are logged at the level and are therefore normally hidden from the user.
Modify Point Names, Data Sampling and Forwarding
Please see Modify Point Names, Data Sampling or Forwarding in Connection Configuration for how to configure these options.
Once you have completed the Tunnel (Push)-specific configuration, you can return to Picking Points in General Configuration to continue.