Toshiba DeviceNet nv Series Instruction Manual page 50

Table of Contents

Chapter 3 Install and Wiring

Node

1.1A

a) Section 1 current consumption = 1.1A + 1.25A = 2.35A

a') Section 2 current consumption = 0.5A + 0.25A + 0.25A + 0.85A = 1.85A

b) Section 1 total extension = 100 m

b') Section 2 total extension = 140 m

c) From Figure 3-5, the maximum current that can flow through the cable in section 1 = about 2.93 A

c') From Figure 3-5, the maximum current that can flow through the cable in section 2 = about 2.19 A (calculated

by linear approximation 100 to 150 m)

d) Since the total current consumption of both sections 1 and 2 < maximum current, power can be supplied to

all nodes with a single power supply central connection.

e) Use a network power supply with a rated current of 4.2 A or more.

(Select a product with sufficient margin in consideration of usage conditions, etc.)

6F8C1686

Section 1

100m

V+

Node

Power

tap

1.25A

V-

Network

power supply

Figure 3-10 Example of overload solutions

Section 2

140m

Node

0.5A

0.25A

Node

0.25A

0.85A

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Dn611b