One of the most important requirements for an industrial automation system is its capability to promptly react to any alarm condition within the plant. The stations are autonomous system elements with the restricted domain of influence to a group of field stations, pertaining to a closed, well defined, and relatively autonomous part of the plant. The Interactive Controller is mainly intended for easy solution of complex, multi-loop interactive control problems whose solution needs a larger number of control and auxiliary computations. The main idea of introducing distributed computer control systems into industrial automation was to decentralize the total automation system through the use of many small computers, distributed within the plant. In case of automation of small-scale plants, P-200 can even be used as the only station of the automation system, being completely autonomous in configuration, parametrization, and operation of the available programmable control loops.