SCADA is an automated system used in industries with complex processes to manage and monitor the control of the automated processes. The system components include computers, controllers, interfaces, networks, instruments, sensors and actuators that analyze the industrial processes through data collection (Indra et al. 44). SCADA collects data and information; transfer it to the central site, execute the necessary analysis, control and displays report information on operator screens. The Importance of SCADA SCADA system core functions include the acquisition of data, network communication, data presentation and control. System components execute these functions by application the sensors and control relays that provide an interface with the system management. Sensors and control relays transmit data to RTUs and PLCs deployed in specific locations of the managed system, and this is where data acquisition occurs. RTUs and PLCs send the acquired data to the master terminal units (MTU) of the SCADA system. The SCADA master unit has a human interface, and it controls, regulates and manages the system automatically. The automatic control is based on the information from the sensor. There is a communication network that provides a pathway connecting SCADA master unit to the RTUs and PLCs (Indra et al. 46). SCADA system is important for the complex industrial processes monitoring and the real-time control. It provokes the increase in efficiency and profitability and helps to reduce costs. Advantages and Disadvantages of SCADA Systems The SCADA systems are pervasive, and, therefore, they have a wide connective area. The system has a diverse functionality with the extensive facilities for development (Bolzoni, Hadziosmanovic and Hartel 235). The efforts required by the end-users and the tasks performance are significantly reduced, and it makes SCADA suitable for the complex industrial processes. SCADA system has a greater robustness and reliability. SCADA is used to regulate and control the critical industrial processes. The systems vendors have a flexible support and maintenance. SCADA systems integrate the automated technologies and monitoring networks. Other advantages include standardization, parallel polling, routable, large addressing range, reduced downtime and minimal frequency of accidents (Bolzoni, Hadziosmanovic and Hartel 246). The significant security challenges, especially in wireless networks whereby non-encrypted communication can be intercepted, are the system’s disadvantage (Eusgeld, Kroger and Nan 78). The complexity of the SCADA system requires the variety of advanced operating skills. Elements of SCADA System SCADA has a complex structure that consists of sensors, actuators, RTUs, PLCs, communication system, master terminal units, front-end processors, servers and redundant servers, HMI computers and software. Measurement sensors and process actuators are the components of SCADA system control loop. Process sensors transmit the measurement variables to the controller. The controller interprets the signals and generates control signals, which then are transmitted back to the process actuators (Dietz, Eusgeld and Nan 681). The actuators convert the data into the new sensor signals and transmit them back to the controller. Sens