What is a tag, Tag properties – IDEC WindSRV User Manual
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be attempted during the off-scan period. The default setting always sends write requests regardless of the
demotion period. If users choose to discard writes, the server will automatically fail any write request received
from a client and will not post an "Unable to write..." message to the server event log.
Note: Users can determine when a device is off-scan by monitoring its demoted state by using the _AutoDemoted
System Tag.
What is a Tag?
A Tag represents addresses within the PLC or other hardware device with which the server communicates. The server
allows both Dynamic Tags and user-defined Static Tags. Dynamic Tags are entered directly in the OPC client and specify
device data. User-defined Static Tags are created in the server and support tag scaling. They can be browsed from OPC
clients that support tag browsing.
Tag Properties
A Tag represents addresses in the PLC or other hardware device with which the server communicates. The server allows
both Dynamic Tags and user-defined Static Tags. Dynamic Tags are entered directly in the OPC client and specify
device data. User-defined Static Tags are created in the server and support tag scaling and can be browsed from OPC
clients that support tag browsing. For more information, refer to
and
Dissimilar to many of the server dialogs, Tag Properties has a number of features that are driven by icons.
Descriptions of the parameters are as follows.
Tag Name: This parameter is used to enter the string that will represent the data available from the tag. The tag
name can be up to 256 characters in length. While using long descriptive names is generally a good idea, some
OPC client applications may have a limited display window when browsing the tag space of an OPC server. The
tag name is part of the OPC browse data Tag names must be unique within a given device branch or tag group
branch. If the application is best suited for using blocks of tags with the same names, then use tag groups to
segregate the tags. See Also:
.
Address: This parameter is used to enter the tag's desired driver address. The address's format is based on the