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Recently, various devices begin to connect the Internet owing to the spread of IoT (Internet of Things). Introduction of IoT technology is progressing also for industrial systems such as plants for the purpose of improving cost efficiency. So, it has become an urgent matter to establish new security countermeasures. But it is not able to respond to some new incidents due to differences in performance or operation between IoT and conventional ICT systems. In some cases, device's stability is more important than the data it self. Therefore, we consider that the security measure from a new viewpoint becomes important. In this paper, we describe the scope of preceding study and hardware security problem that has never been studied. Furthermore, we show the result of load test and impact on output signals under DoS attack. And we propose and implement a new hardware device that can detect DoS attack by only observing electrical signals in the circuit as the countermeasure. Lastly, we explain the contents of the demonstration that implements our proposed method.