In comparison with the conventional centralised system, fieldbus
technology has the advantages of flexibility, reduced cabling,
support cable redundancy,a shorter download time, easy
upgrade and on-line expansion, a guaranteed response time,
multi-vendor interoperability, and easier and faster
design/installation Field area networks are used in a variety
of application domains: industrial and process automation,
Building automation, automotive and railway applications,
aircraft control, and the control of electrical substations,
etc.