Abstract In this chapter, we discuss signal conditioning, the standard ISO model for standardized protocols, networking and integrations with various links, fieldbus systems and wireless communications in the HART and fieldbus, gateways, a standard fieldbus, smart protocols, and the communication methods for intelligent and integrated power plant control systems. Also, a safe fieldbus has been covered. OPC Server, IoT, and IIoT also have been discussed for intelligent and integrated power plant control systems. Various PLC types and their applications in systems such as BMS, the ATRS electrical system SCADA, and offsite plants have also been discussed. Various possible configurations and communications especially meant for power plant DCS have been included. Discussions on software include cybersecurity, integrity, and diagnostics of the system. Discussions have been included on displays and logs in power plant applications. MIS, including performance calculations as per international standards, accounting, etc., are important factors. A composite network including corporate integration methods has been discussed also.