Abstract: The control device is configured to communicate with another device via a communication network, and comprises: a key acquisition unit configured to acquire, from a key distribution server via the communication network, an encryption key with a life period for performing encrypted communication with the another device; an encrypted communication processing unit configured to perform the encrypted communication with the another device using the encryption key within the life period; a server state detection unit configured to detect a key acquisition disabled state where acquisition of the encryption key by the key acquisition unit is disabled; and a life extension unit configured to perform extension processing for extending the life period if the key acquisition disabled state is detected.

Abstract: The control device is configured to communicate with another device via a communication network, and comprises: a key acquisition unit configured to acquire, from a key distribution server via the communication network, an encryption key with a life period for performing encrypted communication with the another device; an encrypted communication processing unit configured to perform the encrypted communication with the another device using the encryption key within the life period; a server state detection unit configured to detect a key acquisition disabled state where acquisition of the encryption key by the key acquisition unit is disabled; and a life extension unit configured to perform extension processing for extending the life period if the key acquisition disabled state is detected.

Abstract: A control arithmetic device controls so that an approval-receiving device displays a content of a new control program that the control arithmetic device received from the editing device. The approval-receiving device receives input of approval information that indicates whether a change of a control program is approved or not from an manager. The control arithmetic device changes the control program to the new control program in the case where the approval information received from the approval-receiving device indicates approval of the control program.

Abstract: A Plant safety design assistance device (100) is configured by a communication device (140), a diagnostics and monitoring device (110), a fault inspection management device (120), and a design and manufacturing device (130) being interconnected via network (150). The diagnostics and monitoring device (110) receives plant status information (dc) from a plant control system (1) and carries out monitoring and diagnostics an the plant. The fault inspection management device (120) maintains fault inspection information (D2) of an apparatus which is used in the plant. The design and manufacturing device (130) maintains design and manufacturing information of the apparatus which is used in the plant. The design and manufacturing devise (130) receives the fault inspection information (D2) from the fault inspection management device (120), and carries out a plant safety design which takes the fault inspection information into account.

Abstract: A Plant safety design assistance device (100) is configured by a communication device (140), a diagnostics and monitoring device (110), a fault inspection management device (120), and a design and manufacturing device (130) being interconnected via network (150). The diagnostics and monitoring device (110) receives plant status information (dc) from a plant control system (1) and carries out monitoring and diagnostics an the plant. The fault inspection management device (120) maintains fault inspection information (D2) of an apparatus which is used in the plant. The design and manufacturing device (130) maintains design and manufacturing information of the apparatus which is used in the plant. The design and manufacturing devise (130) receives the fault inspection information (D2) from the fault inspection management device (120), and carries out a plant safety design which takes the fault inspection information into account.

Abstract: A control arithmetic device controls so that an approval-receiving device displays a content of a new control program that the control arithmetic device received from the editing device. The approval-receiving device receives input of approval information that indicates whether a change of a control program is approved or not from an manager. The control arithmetic device changes the control program to the new control program in the case where the approval information received from the approval-receiving device indicates approval of the control program.