Currently, the development of communication networks has influenced how humans communicate and exchange information. Data communications technology reflects the rapid evolution in the way humans communicate and exchange information. Data communication is the process of exchanging information between two or more devices via a transmission medium, such as cables, radio waves, or other network infrastructure. The goal of data communications is to transfer data from one location to another quickly, efficiently, and accurately. The method used is to look for references from several internet sources such as Google. The OSI model has 7 layers, namely Application Layer, Presentation layer, Session Layer, Transport layer, Network layer, data link layer, physical layer

In Indonesia in particular, SCADA has been recognized and started to be implemented in electric power system control since the early 1980s. In other more developed countries, the application of SCADA is growing along with developments in computer and telecommunications technology. At a time when the development of SCADA was not as sophisticated as it is now, there was an idea to make it easier to maneuver, namely in a simple network system using SCADA we can supply additional power or do power outages easily so that the overload does not occur. After implementing the SCADA system there are less time and frequency savings compared to before implementing the SCADA system. This means that the SCADA reliability index is much better after implementing the SCADA system..