Toshiba 2000 V Series Manual page 60

Chapter 3 Preparations for Operation (Hardware)
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(2) How to determine the most appropriate arrangement of network power units
Follow the procedures below to determine the most appropriate arrangement of
network power units.
(a) Total the network currents consumed by the individual nodes on the network. For
the nodes operating on the network power, use the sum of both currents.
(b) Measure the overall length of the network.
(c) Based on the cable type (thick cable, thin cable) used for the trunk line and the
overall length of the network measured in Step b) above, obtain the maximum
current that can be supplied to the cables, referring to Figure 3-9 and Figure 3-
10.
(d) When the total current consumed by the network (obtained in Step a) is smaller
than the maximum current that can be supplied to the cables (obtained in Step c),
the network power unit installed at the network end can be used to supply the
power to all the nodes (Single power unit terminal connection).
(e) When the total current consumed by the network (obtained in Step a) is greater
than the maximum current that can be supplied to the cables (obtained in Step c),
install a network power unit near the center of the network and check whether it
can supply the power to all the nodes (Single power unit central connection).
(f) If the single power central connection is insufficient to supply the network power
to all the nodes, install additional network power units.
(3) Single Power Unit Terminal Connection
Shown below is an example of configuration where a network power unit is installed at
the end of a trunk line (thick cable) 200 meters in overall length. The current
consumption of each node is shown in the figure below.
V +−
Power tap Node 1
電源タップ
V −
a) Total current consumption = 0.1A+0.15A+0.05A+0.25A+0.1A=0.65A
a) 合計消費電流＝0.1A + 0.15A + 0.05A + 0.25A + 0.1A ＝ 0.65A
Network power
ネットワーク b) Overall power cable length = 200m
b) 電源供給の総延長 ＝ 200ｍ
supply unit 電源供給装置
c) Maximum current that can be supplied to the cables based on figure 3.10 = 1.53A
c) 図 3.10 からケーブルに流せる最大電流 ＝ 1.53A
d) Since the total current consumption is smaller than the maximum current,
d) 合計消費電流 ＜ 最大電流なので、単一電源終端接続で全ノードに
power can be supplied to all the nodes by single power unit terminal connection.
電源を供給できる
e) Install a network power unit with a rated current capacity of 0.65 A or more.
e) ネットワーク電源供給装置は定格電流が 0.65A 以上のものを使用
(Select one with an adequate capacity, considering the conditions of use.)
(使用条件等を考慮して、十分余裕のあるものを選定する)
Figure 3-11 Example of Single Power Terminal Connection
Node 1 Node 1
0.1A 0.15A 0.05A
200 m
model 2000 DeviceNet Module Manual (DN611/DN611A)
Node 1 Node 1
0.25A 0.1A