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UDRF01.04GB
Maintenance manual DRF 400–450
16
11 Common electrics – 11.6 Communication
11.6
Communication
page
–
Communication, general
1. Segment
2. CAN-bus drivetrain
The machine’s communication is handled by a so-called CAN-bus
system. The CAN-bus system consists of control units connected to
form a network.
The idea with a network is to share information. Signal values are
sent out by the control unit that, e.g., is connected to a sensor, other
controls units can use the signal for their functions.
The network consists of control units and segments. Segment is the
CAN-bus between the control units.
11.6.1
CAN-bus
page
–
CAN bus, description
The CAN bus consists of two twisted paired leads (twisted pair).
11.6.2
Redundant CAN-bus
page
–
Redundant CAN-bus, description
Principle illustration redundant CAN-bus
Redundant CAN-bus means that every control unit has two connec-
tions for communication. The CAN-bus is connected in series be-
tween the control units. This means that the CAN-bus can handle
loss of a segment. If several segments are lost, some control unit(s)
lose contact with the network and work independently, often with
limited capacity to perform its task.
The signals can be checked with diagnostic menu.
11.6.3
CAN-bus driveline
page
–
CAN-bus drivetrain, description
Principle illustration CAN-bus drivetrain
Communication with Control unit engine (D794) and Control unit
transmission (D793) is separated from the redundant CAN-bus.
The signals can be checked with diagnostic menu.
D797-F
D797-R
D791
D791-2
D790-1
D790-2
D797-O
D795
1
1
000035
D794
D793
2
D797-F
D797-R
D791-3
D791-2
D791-1
D791-4
D790-1
D790-2
D797-O
D795
003170
CAN R
CAN R
CAN R
CAN R
CAN R
CAN L
CAN L
CAN L
CAN R
CAN L
CAN R
CAN L
CAN R
CAN L
CAN R
CAN L
CAN L
CAN L
D790-1
003171
D794
D793
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