Foundation Fieldbus (styled .mw-parser-output .smallcaps{font-variant:small-caps}Foundation Fieldbus) is an all-digital, serial, two-way communications system that serves as the base-level network in a plant or factory automation environment. It is an open architecture, developed and administered by FieldComm Group. Foundation Fieldbus (styled .mw-parser-output .smallcaps{font-variant:small-caps}Foundation Fieldbus) is an all-digital, serial, two-way communications system that serves as the base-level network in a plant or factory automation environment. It is an open architecture, developed and administered by FieldComm Group.