چكيده به لاتين
Nowadays, physical health of equipment controlled by Cyber-Physical Systems (CPS) is a significant concern. However, there are few researches reported in this area. This paper reports a work, in which, a hardware is placed between PLCs and the actuators as the solution. The proposed hardware operates in two conditions, i.e. passive and active. Operation of the proposed solution is based on the repetitive operational profile of the actuators. The normal operational profile of the actuator is fed to the protective hardware and is considered the normal operating condition. In the normal operating condition, the middleware operates in its passive mode and simply monitors electronic signals passing between PLC and Actuator. In case of any malicious operation, the proposed hardware operates in its active mode and both slowly stops the actuator and sends an alert to SCADA server for running actuator’s emergency profile, and it gains control over the actuator. Thus, the proposed hardware prevents any physical damage on the operating devices. Two sample scenario types are reported where results of implementing the proposed solution is reported and assessed. Results show that once the PLC sends inaccurate data to actuator, the proposed hardware detects this anomaly. Therefore, it does not allow the PLC to send inaccurate and unauthorized data pattern to its actuator. The significance of the work is in introducing a solution to prevent destruction of physical devices apart from source or purpose of applied anomaly and apart from CPS functionality or PLC model and operation.
