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