2 Installation
2.7 NET network
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
59
2.7.2 Cable length with cross-sections
For correct operation of the easyNet network the cable lengths, cross-
sections and cable resistances must match those listed in the following
table.
The impedance of the cables used must be 120
Ω
.
The maximum transmission speed depends on the total length of the
network cables, (
Calculating the cable length for a known cable resistance
If the resistance of the cable per unit of length is known (resistance per unit
length R’ in
Ω
/m), the entire cable resistance R
L
must not exceed the
following values. R
L
depends on the selected baud rates:
l
max
= Maximum cable length in m.
R
L
= Total cable resistance in
Ω
.
R’
= Cable resistance per unit length in
Ω
/m.
Cable length
Cable resistance
Cross section
m
m
Ω
/m
mm
2
AWG
- 40
140
0.13
26
- 175
70
0.25 - 0.34
23, 22
- 250
60
0.34 - 0.5
22, 21, 20
- 400
40
0.5 - 0.6
20, 19
- 600
26
0.75 - 0.8
18
- 1000
16
1.5
16
￫
The installation of an expensive fibre optic link is recommended
with cable lengths > 500 m.
Baud Rate
Cable resistance R
L
Kbit/s
Ω
10 - 125
30
250
25
500, 1000
12
l
max
=
R
L
R’
