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Upon a disruption event that causes the system to fail, it fails to a pre-determined state. Failure in a known safe state helps to prevent systems from failing to a state that may cause injury to individuals or destruction to property. Preserving manufacturing system state information facilitates system restart and return to the operational mode of organizations with less disruption of mission/business processes.
NISTIR 8183 from NVD.NIST
NISTIR 8183 Rev. 1 from NVD.NIST