Compared to discrete manufacturing, the number of process stages necessary in process industry is rather small. However, due to process-technological interferences between the different process stages, the required level of integration and the complexity of information exchange are significantly higher.
In discrete manufacturing, functions are implemented in superordinated systems. In contrast to that, they are directly required in process industry for the entire control level. For that reason MES has to be a Manufacturing Execution Solution where essential parts of the required functionality can be directly integrated in the process control level, depending on production and organizational requirements.