Based on the generalized block diagram of automated industrial equipment, their main electrical and electronic components are examined sequentially. At the beginning, the base of discrete and analogous operating principles of electro-automation is considered in a simple way. The structure and operating principles of the most common sensors, as well as electronic equipment for signal processing are discussed below. Discrete controls for automated machine drives are also considered. A little insight into the human-machine interface elements is given. Finally, an insight into the circuitry and programming of electronic, mainly programmable control systems is given.