Page 14 of the OI reference guide tells you exactly what all is still happening when the robot is disabled. The list includes - 'execution of Pbasic code', so if you had a basic timer it would most likely be counting while the robot is disabled. That is unless you test for the robot being enabled before the timer code:
Code:
if comp_mode = 1 then 'comp_mode = 0 for disabled
'crucial timer code here
endif