
1.CONNECTING DeviceNet FUNCTIONS CONNECTION B-63404EN/03
- 88 -
1.8.3 Verification by Graph-Based Simple Calculation
Voltage drop occurs when current flows to the communications cable.
The longer the communications cable, the larger the current value
becomes and the larger the voltage drop occurs.
The voltage of the communications power supply at each node must
be 11 VDC or more.
The following tables and graphs show the maximum current for each
cable thickness by which a sufficient voltage can be supplied to the
communications power even if a voltage drop occurs.
• Thick cable
Thick cable (m) 0 25 50 100 150 200 250 300 350 400 450 500
Max. current (A) 8.00 8.00 5.42 2.93 2.01 1.53 1.23 1.03 0.89 0.78 0.69 0.63
• Thin cable
Thick cable (m) 0 10 20 30 40 50 60 70 80 90 100
Max. current (A) 3.00 3.00 3.00 2.06 1.57 1.26 1.06 0.91 0.80 0.71 0.64
0
1
2
3
0 10 20 30 40 50 60 70 80 90 100
Thin cable (m)
Max. current (A)
0
1
2
3
4
5
6
7
8
0 50 100 150 200 250 300 350 400 450 500
Thin cable (m)
Max. current (A)