The article analyzes the methods of formation of codes with the summation of data bits. It is noted that the well-known modular codes with summation (either residual codes or Bose-Lin codes) are not the only class of codes with low redundancy that can be used in solving problems of technical diagnostics and synthesis of test-able digital systems. The concept of multi-module code with summation and its subclass – two-module code is introduced. The results of studies of two-module codes with summation are presented, the advantages and disadvantages of two-module codes with summation are noted. The classification of codes with the summation of data bits is given.
technical diagnostics, digital systems, code with summation, Berger code, modular code with summation, Bose-Lin code, two-module code, data vector, error in the data vector