I am using Excel w/ VBA code to read and write to a CLX thru RSLinx. (with AB's rsiopcauto.dll) My question is does anyone have a good idea for verifying that the write was ok? When I read the tags I check the error and qualities to make sure I have valid values. What can I do when I write to the plc? So far my only idea is to read all the tags again, and compare them to what I just wrote. Just wondering if anyone has something more elegant in mind... Thanks