A UDF can be used in multiple circuit programs. If you update a UDF to a new version, synchronize the UDF instances, including any nested UDF instances, to the new version. Depending on how the UDF is used, LOGO!Soft Comfort indicates various conditions pertaining to the UDF update.

A warning signal (!) is displayed in the upper right corner to indicate that the UDF is out of date. You can right-click the block, and select "Update UDF" from the context menu to update the UDF to a new version.

A question mark (?) is displayed if the UDF is not available in the current library. You have to re-import the UDF to the current UDF library to remove this problem.

A green mark (●) means the UDF is configured and of the latest version.

You can also update multiple UDFs at once. Select a group of UDFs, right-click, and select "Update UDF" from the context menu. If there are conflicts, LOGO!Soft Comfort only updates the UDFs that can be updated without conflict. LOGO!Soft Comfort leaves those with conflicts as is, and produces a failure report in the Info Window.