Work with the SignedWrite() function at runtime

It is possible to use the SignedWrite() function to directly assign a value to an attribute that requires a Secured or Verified Write signature.

When you configure a value with Secured or Verified Write security classifications and modify it, the Secured or Verified Writes dialog box appears. Depending on how the value is modified, the content appearing in the Secured or Verified Writes dialog box differs.

• If the value is modified using the SignedWrite() function, then the Secured or Verified Writes dialog box shows options based on the parameter settings from the function.

• If the value is modified by a user operation, then the reason message area shows the field attribute description, if there is one. If the attribute is not a field attribute or does not have a description, then the reason message area shows the description of the ApplicationObject to which the attribute belongs. The predefined Comment list is not available.

You can view the reason message in the Secured Write or Verified Write dialog box when you try to modify the value of the attribute in InTouch WIndowViewer. The dialog box displays the name of the attribute and the new value that is written to the attribute.

Note: The reason description and the predefined Comment list and box are shown in the Secured Write or Verified Write dialog box only in InTouch WindowViewer and not in Tag Viewer.