A Supervisory Control and Data Acquisition (SCADA) system is an Industrial Control System (ICS) which controls large scale industrial processes including several sites over long distances and consists of some Remote Terminal Units (RTUs) and a Master Terminal Unit (MTU). RTUs collect data from sensors and control actuators situated at remote sites and send data to the MTU through a network. Since RTUs operate in a harsh industrial environment, fault tolerance is a key requirement particularly for safety-critical industrial processes. Studies show that a significant number of transient faults due to a harsh environment re-sult in control flow errors in the RTU’s processors. A software error detection technique has been proposed to detect control flow errors in several RTUs. For experimental evaluation 30,000 faults injected on network; the average perfor-mance and memory overheads are about 33.20% and 36.79%, respectively and this technique detected more than 96.32% of injected faults.

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