
1.CONNECTING THE DeviceNet CONNECTION B-64044EN/01
- 56 -
Maximum amount of current that can pass through a thick-wire cable
obtained from the table = 1.53A
Since "Total power consumption < Maximum amount of current" is
satisfied, power can be supplied to all nodes.
- When the power supply is placed in the center (example 2)
The following provides an example of placing the power supply for
communication in the center of a network using a thick-wire cable
(THICK cable) with a total extended length of 240 m for supplying
power.
The maximum amount of current can be supplied to the right and lift
lines separately if the power supply for communication is placed in
the center, so it is possible to supply the maximum current more than
twice, as compared with the case where the power supply is placed at
the end.
Power consumption for each node is assumed as shown below.
Terminator
Node Node
Power supply
for
communication
Terminato
Power tap
NodeNode
120m
Main cable (5-wire cable)
0.3A 0.25A 0.45A0.1A
120m
3 m or
less
Total extended length of power supply line (left side) = Total
extended length of power supply line (right side) = 120 m
Total power consumption (left side) = 0.1 A + 0.45 A = 0.55 A
Total power consumption (right side) =0.25A+0.3A=0.55A
Maximum current obtained from the table for thick-wire cables (left
side) = Approx. 2.5 A
Maximum current obtained from the table for thick-wire cables (right
side) = Approx. 2.5A
(These values are obtained by linear approximation between 100 and
l50 m.)
Since "Total power consumption (left side) < Maximum current (left
side)" and "Total power consumption (right side) < Maximum current
(right side)" are satisfied, power can be supplied to all nodes.