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Fieldbus is an all-digital, serial, two-way communications protocol that standardizes the interconnection of field devices at a communications rate of 31.25 kB/s. The field devices are accessible to communication networks (running at 1 or 2.5 Mb/s), through linking devices. By distributing control into field devices, Fieldbus users reduce the amount of I/O and control equipment required. A Fieldbus-compliant twisted-pair of wires carries signals between the field devices and the networks. Fieldbus also reduces the number of Intrinsically Safe (IS) barriers, cabinets, cables and connectors required. Since the wire pair can support multiple functions within a single device (such as diagnostics, control and auto error correction), the twisted-pair cable becomes an integral part of a more efficient, more reliable, and more cost-effective industrial control system.