Hello,everyone When I have finished my project, I've downloaded my logic and schedule to my PACA.After several days,I found a strange phenomena in my system: I have five networks and four PACA in my project.And I installed Homegate(I've made an interface for my system) in a DELL PC.My PC and my networks is connected by the 5500PC from the COM port. At the beginning,my logic and schedule was running well,but several days after,sometimes one day,sometimes three days or six days,my schedule have not run at my set time.I checked my system,I found the time in my DELL computer was changed! My OS is WIN2000 and the default time format was 24-hours one day.But when I checked my computer,the time format was 12-hours one day! I weened someone changed it so I changed it to 24-hours,and my system was comeback.But after several days,my schedule has the same error again,and my time format was changed to 12-hours again! I re-instell my OS and Homegate,but the error happend as of old. Is the PACA or Homegate could changed the time format in the computer? Or there were some setting errors in my software or the PACA? Who knows why? Please help me.Thank you. PS: when I downloading the logic to PACA,My OS's time format is 24-hours one day.