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Connecting network ea
s
yNet
67
02/16 MN05013001Z EN
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
O
/m), the entire cable
resistance
R
L
must not exceed the following values.
R
L
depends on the selected baud rate:
l
max
= Maximum cable length in m.
R
L
= Total cable resistance in
O
.
R
’
= Cable resistance per unit length in
O
/m
Calculating cross-section with known cable lengths
The minimum cross-section is determined for the known
maximum extent of the easyNET network.
l
= Cable length in m
S
min
= Minimum cable cross-section in mm
2
r
cu
= Resistivity of copper, if not otherwise stated 0.018
O
mm
2
/m
Baud rate
Cable resistance
R
L
kBaud
O
10 to 125
F
30
250
F
25
500
1000
F
12
l
max
=
R
L
R
’
S
min
=
l
x
r
cu
12.4
h
If the calculation result does not correspond to a standard
cross section, take the next higher cross section.
Содержание easySafety
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