Wiring
Operating Manual PMI 6 primo
1004647-EN-02
28
Node 1
Node 2
Node n-1
Node n
RT [
W
]
l
a
Node 3
A
A
RT [
W
]
Fig.: Overall length and length of the stub lines on a CAN network.
Legend:
}
Node: CANopen subscriber
}
a: Length of stub line
}
A: Branch
}
R
T
: Terminating resistor
Relationship between transmission rate, bus length and length of stub lines:
Transmission rate
[kBit/s]
Bus length l [m]
Length of stub line
a [m]
Overall length of all
stub lines [m]
1000
10
1.5
7.5
500
70
5.5
27.5
250
115
11
55
The following table provides an approximate overview of the size of the terminating resistor
R
T
with different cable lengths. In each specific case, details of the characteristic imped-
ance can be found in the cable specification.
Bus length l [m]
Terminating resistor R
T
[Ohm]
0 - 40
120
40 - 300
150 - 300
300 - 500
150 - 300
INFORMATION
Please also refer to the installation guidelines published by the CANopen
User Group.
