ABSTRACT
This chapter focuses on the essential components of the supervisory control and data acquisition (SCADA) systems which will help explain the functioning and the hierarchy, especially for power systems. SCADA systems are complex and require a variety of hardware and software seamlessly integrated into a system that can perform the monitoring and control operation of the large process involved. Communication among devices is key to successful SCADA implementation in modern power systems. The data handled by the SCADA system are critical, and any corruption in the data can lead to serious consequences. Parity check is the simplest method, where a single bit is added to the message so that the sum is always odd. Digital data is a status or contact input which has two states and is generally received as an actual contact/switch closure or a voltage/no-voltage signal. This signal indicates the current status of a system, such as on/off or open/close.
