Dear Erik,
I think, in many cases ( not all cases) just capturing last date of each error code and the total number of errors is enough(especially if errors’ incidence is expected to be reasonably low). But as Kai previously suggested it depends on how sensitive the device is. The drawback of time stamping every occurrence of an error is the need to impractically large amount of memory. And the drawback of using circular queue is that one can’t have any idea about the total number (statistics) of errors unless he/she uses two separate logs (as suggested by james and it is a very good suggestion that I may use it for this unit on a second thought) one circular queue and one to count the total number of errors. But I want to emphasize that certainly different situations need different solutions and in some cases may be absolutely necessary to time stamp every occurrence of errors. Do you agree with that opinion or you think exact time stamping should be practiced routinely?

thank you very much