Beckhoff FC520x Manuel d'utilisateur télécharger pdf (Page 16)

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FC520x / CX1500-x520

BECKHOFF FC520x / CX1500-x520

3.2 Wiring the Bus System

3.2.1 CAN / DeviceNet topology

CAN / DeviceNet is a 2-wire bus system, to which all participating devices are connected in parallel (i.e.

using short drop lines). The bus must be terminated at each end with a 120 (or 121) Ohm terminating

resistor to prevent reflections. This is also necessary even if the cable lengths are very short!

Since the CAN signals are represented on the bus as the difference between the two levels, the CAN

leads are not very sensitive to incoming interference (EMI): Both leads are affected, so the interference

has very little effect on the difference.

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Beckhoff FC520x Manuel d'utilisateur Page 16