Connecting To The Fieldbus; Fieldbus Cable - Festo CDVI-DN Manual

1. Installation
1.3

Connecting to the fieldbus

1.3.1 Fieldbus cable

1-14
Note
Faulty installations or high transmission rates may cause
data transmission errors as a result of signal reflections
and attenuations.
Transmission errors can be caused by:
– Missing or incorrect terminating resistor.
– Incorrect screened connection.
– Branch lines of excess length.
– Transmission over long distances.
– Inappropriate cables.
Observe the cable specifications. Refer to the manual for
your control system for information on the type of cable to
be used.
Use a twisted, screened 5-wire cable as fieldbus line. The bus
interface is supplied with power via the fieldbus line.
Pre-assembled bus cables are available from several manu-
facturers.
Make sure the cables and plugs are suitable for the ambient
conditions (e.g. cleaning agents used) and comply with the
required IP protection class.
Note
If the valve terminal is mounted into a moving part of a
machine, the fieldbus cable on the moving part must be
provided with strain relief. Please observe also the relevant
regulations in EN 60204 part 1.
Festo P.BE-CDVI-DN-EN en 0805a