LogProc IDLE Request Accepted by Tag ? Legend : Alternate Behavior Normal Behavior Precondition : Tag data has changed REQUEST Tag STATUS Software Timer Times Out Yes LogProc SCANS DATA Data Changed? Flag Data for Transfer to LogDB Tag SENDS ALARM Note: Text shown bold is
a sub-system Software Timer Timing No Tag Offline Tag SENDS DATA Low Loop Until All Tags Have Been Polled DISPLAY ON GUI PROGRAMMING Tag Done No Continue Scanning Store Local Yes All Data Scanned? No Yes UPDATE LogDB Update Request From LogDB Figure 5: Activity Diagram
For Update Database Use Case