CONTROL SYSTEM REPRODUCTION MACHINE HAVING JOB RECOVERY

摘要

A multiprocessor (70, 72, 74, 76, 78, 82) 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 information in nonvolatile memory is continually updated. 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.