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5. SETTINGS AND PROCEDURES BEFORE OPERATION
Network
power supply
unit
Termination
resistance
(4) Mixed Trunk Line and Drop Line
The current capacity is calculated as shown below when the network power supply unit is
connected
to
a
6 m of thin-cable drop line.
Master station
Slave station
1.0A
0.15A
Thick-cable power supply distance = 200 m
Drop line power supply distance = 6 m
Total current capacity = 0.5 A + 0.15 A + 0.05 A + 0.25 A + 0.1 A = 1.05 A
Max. current capacity of 200 m of thick cable (from Table 5.1) = 1.53 A
Max. current capacity of 6 m of drop line (from Table 5.3) = 0.75 A
Total current of devices connected to drop line = 0.1 A
Therefore, this configuration allows power supply to all stations.
Table 5.3
Drop line length (m)
Max. current (A)
network
with
200
Slave station
Slave station
0.05A
200m
Maximum Current Capacity Corresponding to
the Drop Line Length
0.30
0.90
1.50
3.00
3.00
3.00
−
5
10
MELSEC-A
m
of
thick-cable
trunk
0.25A
Slave station
0.1A
2.25
3.00
2.00
1.50
line
and
Termination
resistance
4.50
6.00
1.00
0.75
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