All zenon components write in the background messages to joint log file(s) saved in '%programdata%\COPA-DATA\LOG' folder.
These files can be read and configured with Diagnosis Viewer.
You can modify the logging level of a component by clicking 'Client Configuration' in 'Settings' menu and after select the respective process name.
Attention: Set the logging parameters wisely as the time-frame of the LOGs decrease when increasing the detail of the logs written.
You can also find LOG files in SIC in 'Platform > Versions > Version XXXX > Directories > LogDirectory' folder.