Abstract: All real systems are non-linear; conventional controllers cannot always give good and accurate results. The fuzzy logic controller
is used to get the best response. The model for the simulation is developed and all assumptions are made before the model is
developed. An attempt was made to analyze the effectiveness of a fuzzy controller versus a conventional PID controller for an
ammonia synthesis tower temperature control system, and the results were compared. The analysis is performed by computer
simulation using the CoDeSys V2.3 and Matlab-Simulink toolkit. This research shows that using a fuzzy logic controller gives better
results.
Index terms: PID controller, fuzzy controller, control system, MATLAB‐Simulink, CoDeSys V2.3