Is there any impediment in FF HSE that doesn´t allow access to FF instruments config located on a remote network?
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Consider the rules in the manual, its a good start. Type "HOP" in your pdf reader search box, you will find that 5 hops is the max allowed. Is not specific about HSE, but more as a guideline.
HOP: A measure of distance in a network. The hop count is equal to the number of routers that must be passed to reach a destination.
Sorry for delayed response to direct question, Which ABB control system you are using with FF setup ? I am not sure with remote access and networking aspect, but note that while accessing device configuration, if something is changed then you need to download at all the level HSE(LD800) to H1(Device). else you get problem with device connection.