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The D2000 GateWay Client process can also be configured to access remote historical objects. In this mode, it masquerades as an archive (i.e. process name SOME_NAME.ARC). It receives from the D2000 Server a list of historical objects for which it is the parent and tries to verify whether the required historical objects exist in the source system and, if so, ensures the transfer of the values of these objects (if the historical objects publish their values).
By defaultTherefore, it is therefore necessary to create a new archive process in the destination system (e.g. REMOTE.ARC) and import the definitions of the required historical objects from the source system, changing their parent to this new archive process. Subsequently, the D2000 GateWay Client must be started in historical mode.
At the same time, the D 2000 D2000 GateWay Client implements reading values of historical objects into graphs and handles the following actions in the script:
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No values are transferred from the destination system to the source system, and deletion and on-demand recalculation of calculated/statistical historical objects are not allowed on demand, the . The value transfer is always unidirectional, so the gateway works as a Data Diode.
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The GateWay Client process can be, however, operated at the same time in the "transparent gateway " mode and "historical gateway mode" configurations.
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The historical mode of the gateway is a solution in cases when:
- it It is necessary to access the values of the historical objects in the remote system/systems, while it is not desirable to archive them locally (e.g. there is a large number of objects, or not enough disk capacity/memory/power is available for archiving),.
- these There are script-filled historical objects, for which it would be necessary to duplicate the data-filling mechanism on the target system as well,.
- in In a test environment, it is necessary to make available (for reading) complete historical data from the production environment (e.g. including data from the depositories, which do not have to be configured on the test environment),other testing or debugging purposes.
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To activate the historical mode of the gateway, start the GateWay Client with /ARC parameter.
Running An example of running: The GateWay Client will connect to the target system as REMOTE.ARC process and communicate with the GateWay Server listening on address 172.16.0.22 and port 1000.
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