When the pushbutton switch 80 is closed, {HEAD ~ the controller unit} 66 begins execution of the program 200 at {TAIL ~ time} T0 
When the pushbutton switch 80 is closed , { HEAD ~ the controller unit } 66 begins execution of the program 200 at { TAIL ~ time } T0
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH