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With this topology, the fieldbus devices are connected to the bus segment through a length of cable called a spur. A spur can vary in length from 1 m to 120 m. A spur that is less than 1 m in length is considered a splice.

PROFIBUS provides a wide range of possible transmission rates. The permissible lengths of possible spur cables depend upon the transmission rate used. No spurs are permitted for transmission rates over 1,5 Mbit/s. With transmission rates less than 1,5 Mbit/s the total length of all spur cables should be less than 6,6 m. When using spurs with low transmission rates (93,75 kbit/s), the ratio between spur cable length
and next bus termination should be at least 1:20.

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