The contribution of this paper is the introduction of ECA paradigm for the design of modular logic controllers that are reconfigurable. Modularity, integrability and diagonosability measures that have been used to measure the reconfigurability of manufacturing systems are used to assess the reconfigurability of the developed controllers. This paper applies the ECA concept to the design of modular logic controllers begins by describing what an ECA logic system is and then focuses on how ECA logic systems can be implemented with modular control approaches. Modular Finite State Machines are used to construct ECA logic system. Three qualitative measures for reconfigurability are presented.