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Function Tags

For instructions on how to create a function tag, see Function Tags.

Function tags are not tied to devices and cannot be contained within devices; a function tag can only be created at the root or in a folder that is not located in a device. These tags perform either predefined or user-scripted functions to generate or retrieve values. While they are not able to communicate with the PLC hardware directly, any function tag can read from and/or write to one or more device-based tags for a variety of purposes.

Function tags can be created from the header toolbar of the Tags interface. The following function tags exist:

  • Virtual Tag runs user-written scripts.
  • Accumulator accumulates its source tag's value.
  • Counter counts changes in the source tag's value.
  • Vector Element retrieves one element from the source tag-returned array.
  • Regulator manipulates the value of one device-based tag on the basis of another tag's value.
  • Generator returns an integer with specified parameters. It is the only function tag that cannot be linked to a device-based tag.

Tag Editor provides general coverage of tag parameters; special remarks on function tags as well as information on their uniquely implemented parameters can be found in the respective articles above.