If the periodic pulse is not detected by {TAIL ~ the slave processor}, the slave processor disables {HEAD ~ the output} of the master processor wherein the output of the slave processor becomes enabled 
If the periodic pulse is not detected by { TAIL ~ the slave processor } , the slave processor disables { HEAD ~ the output } of the master processor wherein the output of the slave processor becomes enabled
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH