Since zenOn 6.22 SP1 the VBA help documentation is integrated within the general help documentation (as an extra node in the tree).
With zenOn 6.22 SP0 the VBA help documentation is available at the installation path of zenOn (i.e. "C:\Program Files\COPA-DATA\zenon 6.22 SP1\HELP\ENGLISH\VBA.chm)
If you are using a zenOn version < 6.22 the VBA help documentation can be downloaded at following links:
VBA Help [BETA] Download (release date 2007-11-15):
http://www.copadata.com/forums/showthread.php?t=37
VBA Object Overview:
http://www.copadata.com/forums/showthread.php?t=45