Toshiba V Series Manual page 54

Chapter 3 Preparations for Operation (Hardware)
3
34
V +−
Power tap Node 1
電源タップ
V −
a) Total current consumption
a) 合計消費電流＝0.1A + 0.15A + 0.05A + 0.25A + 0.1A ＝ 0.65A
Network power
b) Overall power cable length
ネットワーク
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
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
電源を供給できる
connection.
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
e) Install a network power unit with a rated current capacity of 0.65 A or more.
(使用条件等を考慮して、十分余裕のあるものを選定する) (Select one with an adequate capacity, considering the conditions of use.)
Figure 3-11 Example of Single Power Terminal Connection
(4) Single Power Unit Central Connection
Shown below is an example of configuration where a network power unit is installed
at the center of a trunk line (thick cable) 240 meters in overall length. The current
consumption of each node is shown in the figure below.
The central location of the network power unit permits supply of the maximum current
in all directions of the network.
セクション 1 Section 1
120 m
Node 3 Node 2 Node 1
0.1A 0.25A
Figure 3-12 Example of Single Power Unit Central Connection
(a) Total current consumption of section 1
(a') Total current consumption of section 2
(b) Overall power cable length of section 1 = Overall power cable length of section 2
= 120 m
(c) Maximum current that can be supplied to the cables based on Figure 3-10 =
About 2.56 A (Obtained by linear approximation of 100 to 150 m)
(d) Since the total current consumption is smaller than the maximum current, power
can be supplied to all the nodes by single power unit central connection.
(e) Install a network power unit with a rated current capacity of 0.65 A or more.
(Select one with an adequate capacity, considering the conditions of use.)
Node 1 Node 1
0.1A 0.15A 0.05A
200 m
V +−
電源
Power
タップ
tap
V −
0.2A
ネットワーク
Network power
電源供給装置 unit
model 3000 DeviceNet Module Manual (DN311/DN311A)
Node 1 Node 1
0.25A 0.1A
Section 2
セクション 2
120 m
Node 4 Node 5 Node 6
0.15A 0.25A 0.15A