This paper is devoted to a problem of the hidden faults
which is shown in digital components of the safety-related
systems aimed at providing of the functional safety of objects
with the increased risk. These systems are considered on the
basis of resource approach as development of computer
systems with diversification of an operating mode by its
division on normal and emergency. The problem consists in
accumulation of faults throughout a continuous normal mode
in absence of the input data showing them. In the most
responsible emergency mode, accumulated faults are shown
in lowering of fault tolerance on which the functional safety is
based. The problem of the hidden faults is identified as a
problem in development of resources where diversification of
a checkability of the circuits contradicts designing of the
digital components at the bottom level of resource
development – replication. Problem solutions by increase in
the level of resource development in designing of the digital
components, including a method of a choice of the version in
program codes of the FPGA project are suggested.
