5. External connections
5.6 CAN1 interface for the CANopen protocol, J1939 protocol, etc.
The maximal baud rate depends on the cable length
Possible baud rates
With a max. cable length
of
25 m
1000 kBit/s
50 m
800 kBit/s
100 m
500 kBit/s
M 250
250 kBit/s
500 m
125 kbit/s
500 m
100 kBit/s (can be set through soft-
ware)
1000 m
50 kBit/s
2500 m
20 kBit/s
5000 m
10 kBit/s
When preparing connections, ensure that the cable shield has a low
impedance connection with the connector housing.
5.6.0.2 CAN-Bus-topology
l
A bus segment can interconnect up to 32 slaves.
l
Several bus segments can be connected using repeaters (bi-directional amplifiers).
The use of repeaters enables the maximum cable length to be
increased.
Repeaters can also be used for galvanic isolation. For more details,
please consult the documentation for repeaters provided by man-
ufacturer.
Make sure to follow the recommendations provided by CiA (CAN in Auto-
mation) at http://www.can-cia.org.
A bus segment must be provided with cable termination (120 Ohm) at both ends.
These terminals must be connected in the plug directly between pin 2 and 7.
The bus segment must be terminated at both ends.
No more than two terminations must be provided for each bus segment.
Operation without correct cable termination can cause transfer errors.
Figure 30: CAN bus segment with four nodes
56
XV300
12/15 MN048017 EN www.eaton.eu
