G - Physics – 06 – F
Patent
G - Physics
06
F
354/225, 354/230
G06F 11/00 (2006.01) G05B 19/05 (2006.01) G06F 11/28 (2006.01)
Patent
CA 1124871
CHECKING PROGRAMMED CONTROLLER OPERATION Abstract Programmed controllers execute sequences of control functions for controlling a device. External noise can cause controller malfunctions on critically operated de- vices. Proper sequencing is verified by assigning access key/check codes to particular sequences. A check key code is generated during execution of a sequence only if the sequence is properly executed by the pro- grammed controller. At completion of the control sequence, the generated code is compared with the access or original code for verifying appropriate programmed controller sequencing. Several sequences can be embedded or nested in each other, each having its own check key with the overall sequence also having an independent check key. BO977040
345520
Dodt William C.
Lutter Edward P.
International Business Machines Corporation
Na
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