Patent ID: 11860604
Assignee: NEC CORPORATION
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An analysis assistance apparatus comprising:
a processor; and
a memory storing instructions executable by the processor to:
obtain a control program for controlling respective parts of a plant based on sensor data from a sensor installed in the plant;
obtain event information as information necessary for searching the control program for a safety barrier for avoiding an occurrence of a predetermined event in the plant, the event information including a variable that defines a state of the plant when the predetermined event has occurred and a value thereof;
extract, from the obtained control program, a causal relationship between an input variable and an output variable in the control program;
generate, with use of the variable and the value included in the event information and the extracted causal relationship, a state transition graph which indicates a state transition from the state defined by the variable and the value included in the event information, and which includes an origin point and an end point of the transition and a transition condition that causes the transition; and
search the control program for the safety barrier based on the variable and the value included in the obtained event information and on the extracted causal relationship, by specifying, from the generated state transition graph, a transition to a state where the occurrence of the predetermined event has been avoided.