DEVICE FOR DETECTING UNAUTHORIZED MANIPULATIONS OF THE SYSTEM STATE OF AN OPEN-LOOP AND CLOSED-LOOP CONTROL UNIT AND A NUCLEAR PLANT HAVING THE DEVICE

摘要

A device detects unauthorized manipulations of a system state of an open-loop and closed-loop control unit, in particular of a programmable logic controller, of a nuclear plant. The device should be able to reliably detect unauthorized manipulations. For this purpose, a monitoring module is provided, which monitors the operating state, hardware expansion state and/or program state of the open-loop and closed-loop control unit and generates an indication when the state changes.

主权项

1. A device for detecting unauthorized tampering of a system state of an open and closed-loop control unit, the device comprising:
a monitoring module monitoring at least one state selected from the group consisting of an operating state, a hardware expansion state and a program state of the open and closed-loop control unit, said monitoring module generating a message in an event of changes to the state; a supervision module monitoring an operation of said monitoring module; said monitoring module monitoring an operation of said supervision module; and the open and closed-loop control unit containing a programmable logic controller, said monitoring module and said supervision module are software components of the programmable logic controller that both check whether the other module is processing program statements as planned within a predetermined time period.