Control system job recovery after a malfunction

Details Control system job recovery after a malfunction Control system job recovery after a malfunction

G - Physics

03

G

314/7

G03G 15/00 (2006.01)

Patent

CA 1213307

ABSTRACT OF THE DISCLOSURE The present invention is a multiprocessor control system that allows full job recovery after a machine power down or after a malfunction or software crash or temporary power outage. In particular, essential variables such as the state and status of the machine and the programmed job at the time of the malfunction are maintained in nonvolatile memory. This informa- tion is continually updated in nonvolatile memory. Once the control system has reset and reinitialized all the control elements after a malfunction, the control restores or downloads all the relevant variables in the nonvolatile memory to the various control elements to maintain status. In another embodiment, the essential variables are maintained in RAM locations in a master processor and saved for downloading to the control elements.

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