IDEC WindSRV - Manual (Page 18)

17
www.kepware.com
KEPServerEX5 Help
Descriptions of the parameters are as follows.
 Cache Lifetime: This parameter is used to determine how long the server will keep the resolved addresses from
host names. The server caches network addresses that it has resolved from host name requests for a period of
time to improve performance when the same address is requested repeatedly. The period is 30 to 7200 seconds.
The default is 30 seconds.
 Request Pool: This parameter is used to specify how many simultaneous requests for Host Name Resolution can
be processed at one time. It allows multiple Ethernet drivers to process at the same time and also manages the
resources that are used to resolve host names. The range is 1 to 8 requests. The default is 4.
Tag Management
The server's new user-defined tag management features can be used to create a tag database structure that fits an
application's specific nature. Multiple tag groups can be defined to segregate the tag data on a device-by-device basis.
Drag and drop editing makes adding large numbers of tags easy. Additionally, CSV import and export allows tag editing
to be done in any application needed. Like all other server features, new tags can be added to the application at any
time.
Automatic Tag Database Generation
The OPC server supports the automatic generation of tags for select communication drivers. The Automatic Tag
Database Generation feature brings OPC technology one step closer to Plug and Play operation. Drivers that support
this feature can either Read tag information directly from a device or generate tags from stored tag data. In either
case, the user no longer needs to manually enter OPC tags into the server.
System Tags
System Tags are used to provide general error feedback to client applications, allow operation control over when a
device is actively collecting data and allow the standard parameters of a either a channel or device to be changed from
an OPC client application. The number of System Tags available at either the channel or device-level varies depending
on the nature of the driver being used. The System Tag can also be grouped according to their purpose as both status
and control or parameter manipulation.