Analog control and digital system with integrated interface for electric power and other plants

An integrated digital/analog control system for an electric power or other industrial plant comprising an analog control system and a digital control system, said control systems having means for generating outputs which control the plant in response to input signals therefrom, a plurality of plant transducers and transmitters generating respective input analog signals for use in controlling the plant, respective circuit means for powering each of said analog transmitters and for generating buffered analog signals corresponding to the transmitted analog signals and being compatible with both said analog and digital control systems, an analog input information panel for terminating the buffered analog signals, means for coupling each of said buffered analog input signals from said analog input information panel to one or both of said analog and digital control systems, a plurality of plant contacts generating respective input digital signals for use in controlling the plant, respective circuit means for conditioning each of said digital signals to a logic level compatible to said analog and digital control systems, a digital input information panel for terminating the digital input logic signals, and means for coupling each of said digital input logic signals from said digital input information panel to one or both of said analog and digital control systems.