Patent attributes
A process controller includes a first virtualizer to run in a first process controller and a first operating system to run on the first virtualizer, the first operating system transiting from a first state to a second state when control of an industrial process is started. The first operating system transits from the second state to the first state when control of the industrial process for one period ends, the first state being waiting for starting the control of the industrial process, and the second state being when the industrial process is performed. An application runs on the first operating system and performs control of the industrial process at a constant period. A saving unit saves information representing an inner state of the application when the first operating system is in the first state, the information restoring the application in a second process controller different from the first process controller.
