Event driven program model is very good tool to write discrete control programs based on sequential logic, but to create combinational logic based controls is more problematic. The paper presents one implementation of event driven software model of combination logic networks. The paper first reviews the basics of event-driven systems. Greater part of article presents the mathematical basic and architecture of event-driven combinational logic and one software implementation of the model. The paper ends with description of event-driven universal software gate. © 2012 IEEE.