Webster defines "open" as "having no enclosing or confining barrier: accessible on all or nearly all sides," whereas "interchangeable" means "permitting mutual substitution." Yet differing opinions persist about the openness of fieldbus applications. Some say the term is based on access to and compliance with a certain standard, while others contend openness refers to the interoperability of components and software, regardless of application or even the inter-changeability of different vendors' products.
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