Property tags – IDEC WindSRV User Manual
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The _System branch found under the DeviceName branch is always available. If referencing a system tag from a DDE
application given the above example and the DDE defaults, the link would appear as follows:
=
|_ddedata!Channel1.Device1._System._Error
The _Enabled tag provides a very flexible means of controlling the OPC applications. In some cases, specifically in
modem applications, it can be convenient to disable all devices except the device currently connected to the modem.
Additionally, using the _Enable tag to allow the application to turn a particular device off while the physical device is
being serviced can eliminate harmless but unwanted communications errors in the server's event log.
See Also:
and
.
Note: Modem Tags are described in the topics under Modem Support.
Property Tags
The Property Tags are used to provide Read Only access to Tag Properties for client applications. To access a tag
property, append the property name to the fully qualified tag address that has been defined in the server's tag
database. For more information, refer to
.
If the fully qualified tag address is Channel1.Device1.Tag1, its description can be accessed by appending the description
property as Channel1.Device1.Tag1._Description.
Supported Property Tag Names
Tag Name
Description
_Name
The _Name property tag indicates the current name for the tag it is
referencing.