7.8.2 Colours of the Cables
CANopen does not pre-define the colours of the bus lines. To facilit-
ate wiring and fault-finding, we recommend the following colours for
the bus lines:
Signal Description Colour
CAN_L CAN-Bus-Signal (dominant low) Blue
CAN_H CAN-Bus-Signal (dominant high) White
GND
External electrical ground
Black
CAN_V+
External voltage supply (+24 V)
Red
7.8.3 Topology of the Network
Owing to laws of physics within a bus system, a
topology is required. A line structure is specified
for the CAN-bus by CiA-417.
This line structure cannot always be realised in
practice. Therefore it is possible to connect fur-
ther lines via repeater or gateway. Please note
that every line behind a gateway or a repeater is
to be regarded as an independent bus and con-
sequently properly terminated at both ends
62 Installation Manual System »bp308« – Electrical Installation
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