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4 SETUP AND PROCEDURES BEFORE OPERATION
Network power
supply unit
Termination
resistance
4 - 14
(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 network with 200 m of thick-cable trunk line and 6 m
of thin-cable drop line.
Master station
Slave station
1.0A
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 4.4) = 1.53 A
Max. current capacity of 6 m of drop line (from Table 4.6) = 0.75 A
Total current of devices connected to drop line = 0.1 A
Therefore, this configuration allows power supply to all nodes.
Table 4.6 Maximum current capacity corresponding
Drop line length (m)
0.30
Max. current (A)
3.00
Slave station
0.15A
0.05A
200m
to the drop line length
0.90
1.50
3.00
3.00
MELSEC-Q
Slave station
0.25A
Slave station
0.1A
2.25
3.00
4.50
2.00
1.50
1.00
Termination
resistance
6.00
0.75
4 - 14
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