[en] Main units of a new system of diagnostics, acquisition and processing of beam data in the case of fast extraction of protons from the Serpukhov synchrotron are described. Functionally the devices of the beam diagnostics system are divided into three groups: devices for measuring the position of the centre of gravity of the beam, devices for measuring sizes and profile of the beam, devices for measuring the external target charge and radiation losses. A scheme of converting the analogous information into the digital form and its input into an electronic computer is described. The information goes into the electronic computer in the process of three sequential operations in the system of fast extraction. The inputted information is processed by an electronic computer according to ERA program. Interrelation of the program and accelerator operations is shown. Data processing results are printed out on the ALT display, TT ASR-33 and on gas-discharge indicators display. The created system for diagnostics of fast extraction was used during several runs and provided high quality of beam alignment and retaining of its stability