What is the minimum distance between two devices on PROFIBUS DP?

When the transmission speed is 1.5 Mbits/s or higher, it is highly recommended to have at least 1 m of cable between 2 devices. The cable compensates for the input capacitance of both devices to preserve the common impedance. When the devices are very close together, there is a large chance that reflections in the data communication (small short circuits) can be caused by the input capacitance.

The effect is much less common at transmission speeds lower than 1.5 Mbits/s. More.

When the transmission speed is 1,5 Mbps or higher, it is highly recommended to have at least 1 m of cable between 2 devices. De input capacitance of both devices will be compensated by the cable in order to preserve the common impedance. When the devices would be very close together, there is a big chance the input capacitance causes reflections in the data communication (small short circuits).

The effect is much less at transmission speeds lower than 1,5 Mbps. More.

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