Impact of automation is visible in all areas of industry as well as in everyday life. Automation makes the process control more efficient, increases productivity of work, manufacturing quality, decreases manufacturing costs. Automation is still in development so that it could succeed in filling all requirements of today's technical advance. The role of the communication is exchanging of connection with a common computer in order to create and transmit the program to PLC and to transmit data to superior levels for operator's control of technology. The use of fiber optics in SCADA(Supervisory Control and Data Acquisition) systems has increased due to inherent advantages of using fibers.