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The value transfer is executed only on the basis of verification of object match between D2000 Systems. To transfer the values, select the particular objects or group of objects filtered by mask and then enter them to into the start parameters of the GateWay Client process.
The destination system tries to verify whether the required objects exist in the source system and if so, it ensures transferring the value of these objects. If the source system does not contain a particular object, it will have an invalid value in the destination system.
If the list of objects is changed (any object is added or deleted) while running the GateWay Client in the destination system, which corresponds with the mask, the proper action is executed towards the source system (logging on/off of object).
Any No values are not transferred from the destination system to the source onesystem. The value transfer is always unidirectional, so the transparent gateway work works as a Data Diode.
The structured variables can be transferred only as a whole.
The feature Destination column for I/O tags is not supported. A user must select the values of the given destination structure that are to be transferred.
The GateWay Client process may be executed both as it is defined for remote tags can be operated at the same time in the standard remote tags mode and as the transparent gateway.
Use of transparent gateway
The transparent historical mode of the gateway is a solution providing thatin cases when:
- there are done the changes or modifications of to the functional and production systems, which deployed system are made and these are first tested on a parallel system,
- there is executed the test of new hardware when upgrading testing of new HW is carried out during the planned upgrade of the existing system,
- other testing or debugging purposes.
Limitations
You should realize that the transparent gateway assigns the values to objects which that are children of some D2000 processes. Therefore, these processes must be stopped in the destination D2000 System. These are usually the communication processes and calculation processes.
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To activate the transparent gateway, start the GateWay Client with one or more /ROV parameters (Read Object Values).
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/ROV parameter is followed by a name (or more names separated by a comma) of an object or mask for more objects. To transfer the object values together with the child, add the '+' (plus) character at the end.
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| /ROVSELF.KOM+ | Ensures the value transfer of the SELF.KOM process together with its children (lines, stations, I/O tags). |
| /ROVM.* | It is used for value transfer of the I/O tag which tags whose name starts according to the ordinary naming 'M.'. |
| /ROVM.OBJ1,M.OBJ2 | Value transfer of objects M.OBJ1 and M.OBJ2. |
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Note: at most one substitution is performed on the D2000 object name (expression is searched for from the beginning of the name). For example, if an I/O tag M.MPPS.test.MPPS exists, then the parameter /MONMPPS,MES causes the I/O tag M.MES.test.MPPS to be opened on the remote side.
Pairing objects by UID
Transparent A transparent gateway supports pairing not only by object names but also by UID objects. This feature is enabled by the start parameter /UID, which must be used when starting both the GateWay Client and GateWay Server processes.
This feature can be used to implement the functionality of a transparent gateway regardless of changes in the names of the objects (provided that they have the same UID), i.e. objects can be renamed.
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Optimization for XML import
When performing XML import of multiple objects to the destination system, the D2000 Server used a lot of CPU for performing refreshes of as object lists. Refreshing can be delayed by starting the GateWay Client with the /GTWDL<seconds> start parameter (refresh will be performed with a delay equal to the specified seconds parameter - the recommended value is 10).
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To activate the detailed debug information, start the GateWay Client with these parameters:
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After receiving the TRGTW command, the GateWay Client lists the status of all required objects.
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