  Planck units are natural physical scales of mass, length and time, built with
the help of the fundamental constants $\hbar, c, G$. The functional role of the
constants used for the construction of Planck units is different. If the first
two of them represent the limits of the action and the speed of light and
underlie quantum mechanics and special relativity, the Newton's constant $G$
"only" fixes the absolute value of the gravitational forces. It seems natural
to make a set of fundamental constants more consistent and more effective if
used to build Planck units only limit values. To this end, in addition to the
limit values $\hbar $ and $c$ we introduce an additional limit value - a
maximum power in nature. On the basis of these values, a modification of the
Planck unit system is proposed. The proposed modification leaves unchanged the
numerical values of Planck units, however, opens up exciting new possibilities
for interpreting the known results and for obtaining new ones.
