Festo CTEU-DN, Description, Functions And Maintenance, Page: 32 / 130

2. Installation and interfaces
2-10
Festo P.BE-CTEU-DN-OP+MAINT-EN en 1206NH
Fieldbus connecting cable – Specification and configuration
For fieldbus communication, Festo recommends the use of a
two-pair, screened fieldbus connecting cable (network cable).
•
You need at least a screened 4-wire line
(CAN_H/CAN_L as well as V +/V –).
•
Preferably use cable with twisted and screened wire
pairs.
•
Always use a terminating resistor (121Ω ±1%, 0.25W)
at both ends of the fieldbus between the wires for
CAN_H and CAN_L.
•
Connect the screening of the fieldbus cable to the
fieldbus plug.
•
Connect the screening continuously to all fieldbus
cables and earth the screening only once (star-
shaped) to avoid ground loops.
•
Make sure that the connected fieldbus equipment or
the decentralised adapter is earthed.
•
Observe the specifications in the manuals of your con-
trol system, in particular regarding the bus lines,
cable type, max. length of branch lines and branches
as well as the connection technology (network plug,
adapter).
•
In calculating the max. effective data rate, also take
into account the length of branch lines and branches
Section 2.2.6, “Setting the DIL switches”
Information on maximum usable data rate (baud
rate).