YASKAWA DX200 Instructions Manual page 61

165626-1CD
JARCR-XFB01B Board
for DeviceNet
7 Connections for DeviceNet Communications
7.1 Location of Communication Power Supply
3. Simplified Calculation with the Estimated Values from the Graph
The voltage of the communications power supply to each node must
be 11 VDC or more.
If not, the communications will be unstable.
A current flowing to the communications cable causes a voltage drop.
The longer the communications cable is or the greater the current is,
the bigger the voltage drop will be.
The following tables show the maximum allowable current that can
supply sufficient voltage to the communications power supply
regardless of a voltage drop for a thick cable and a thin cable.
a) For a thick cable
Distance
0 25 50
(m)
Max. 8.00 8.00 5.42 2.93 2.01 1.53 1.23 1.03 0.89 0.78 0.69 0.63
current
(A)
8
7
6
Max.
5
Current
(A) 4
3
2
1
0
0 50 100
b) For a thin cable
Distance
0 10 20
(m)
Max. 3.00 3.00 3.00 2.06 1.57 1.26 1.06 0.91 0.80 0.71 0.64
current
(A)
3
2
Max.
Current
(A)
1
0
0 10 20 30
7-4
100 150 200 250 300
150 200 250 300
Distance (m)
30 40 50 60 70
40 50 60 70 80
Distance (m)
HW1481973
350 400 450 500
350 400 450 500
80 90 100
90 100
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