The non volatile memory may comprise a disk drive or read only memory device which stores a program to implement {TAIL ~ the above control} and store appropriate values for {HEAD ~ comparison} with the process variables as is well known in the art 
The non volatile memory may comprise a disk drive or read only memory device which stores a program to implement { TAIL ~ the above control } and store appropriate values for { HEAD ~ comparison } with the process variables as is well known in the art
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH