A universal inhibitor Petri net is constructed, which executes an arbitrary given inhibitor Petri net. The inhibitor Petri net graph, its marking, and transition firing sequence are encoded as 10 scalar nonnegative integer variables and are represented by the corresponding places of the universal net. An algorithm of inhibitor net execution that uses only these scalar variables is developed based on the state equation and is encoded by the universal inhibitor Petri net. Subnets that implement arithmetic, comparison, and copying operations are employed.