Information or Enterprise Level
This is the top level of the industrial automation which manages the whole automation system. The tasks of this level include production planning, customer and market analysis, orders and sales, etc. So it deals more with commercial activities and less with technical aspects.
And also industrial communication networks are most prominent in industrial automation systems which transfer the information from one level to the other. So these are present in all the levels of automation system to provide continuous flow of information. This communication network can be different one level to the other.
From the above hierarchy we can conclude that there is continuous information flow from high level to low level and vice-versa. If we assume this graphical way, it is like a pyramid in which as we go up, the information gets aggregated and while going down, we get detailed information about the process.