1.1 Routing of PROFIBUS Cables

1.1.1 Copper cable (part one)

General plant or factory cabling can carry high voltages and currents. Running PROFIBUS cables parallel to such cables can lead to interference pickup and thus to data transmission errors. Interference can be reduced by :

- as large cable spacing as possible.

- minimizing the length of any parallel runs of cable.

- maintaining minimum cable bending radius.

Telecommunication cable

Special rules apply to public telecommunication cables (telephone cables, etc.). In this case, the country-specific regulations must be observed (in many countries, telecommunication cables must not be routed together with other cables).

Boundary conditions

Classifying the cables according to voltage classes is based on the assumption that the interference voltages carried along are lower the lower the carried voltages and currents are. For this reason, data transmission cables are generally without risk. Particularly critical are interference voltages in the kHz to MHz range. High-frequency interference can also arise on power supply cables with direct voltage or 50/60-Hz alternating voltage when the supply is switched, e.g. through a frequently switching relay or an inverter.