DCN4-BR4D Omron, DCN4-BR4D Datasheet - Page 58

• Manufacturer Part Number: DCN4-BR4D
• Description: Thin Cable-Flat Cable Conv Con
• Manufacturer: Omron

Specifications of DCN4-BR4D

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2-2-3
Selecting between Thick
and Thin Cable
Combining Thick and Thin
Cables
Network Configuration
Proper Cable Usage
1,2,3...
Note The communications power supply can also be supplied through a T-branch
The following table shows the limitations of the thin and thick cables.
The branch line length and total branch line length limitations are the same for
both thin and thick cables. The cables differ in the following two capabilities.
1. Maximum network length
2. Current capacity
Tap or T-branch Connector, but the current capacity of a T-branch Tap is 5 A.
The current capacity of the thin-cable T-branch Connectors is 3 A and the cur-
rent capacity of the thick-cable T-branch Connector is 8 A. Consequently, the
conditions for supplying power through a T-branch Tap or thin-cable T-branch
Connector are as follows: There can be only one communications power sup-
ply in the network and the total current consumption (in both directions) is lim-
ited to 5 A for a T-branch Tap or 3 A for a thin-cable T-branch Connector.
Thick and thin cable can be combined in the line connecting most distant
nodes, but the max. network length will be shorter than it would be with thick
Thick cable 500 kbps
Thin cable
Cable type
With thin cable, the maximum network length is limited to 100 m in all cas-
es. At 500 kbps, the maximum network length is the same for both thick
and thin cables, so this limitation is not a consideration when the baud rate
is 500 kbps.
Thick and thin cable can be used in the same network, but the max. net-
work length declines as more thin cable is used. Refer to Combining Thick
and Thin Cables on page 37 for the equations used to calculate the max.
network length when thick and thin cable are used together.
In the trunk line, the cable current capacity (max. current allowed in the ca-
ble) is 3 A for thin cable and 8 A for thick cable. Consequently, thick cable
can provide a significantly higher current when the communications power
supply is being supplied through a Power Supply Tap. If thin cable is being
used, the current in any one direction is limited to 3 A regardless of the ca-
pacity of the 24 V DC power supply that is connected.
Current
8 A max.
Power Supply Tap
Communications
power supply
250 kbps
125 kbps
500 kbps
250 kbps
125 kbps
←
Baud rate
Thick cable
→
Current
8 A max.
100 m
250 m
500 m
100 m
100 m
100 m
Max. network
length
Thin cable
Thick cable
Current
3 A max.
Current
8 A max.
6 m max.
Power Supply Tap
Power Supply Tap
Communications
power supply
←
Communications
power supply
line length
←
Branch
→
→
Thin cable
Thin cable
39 m
78 m
156 m
39 m
78 m
156 m
Current
3 A max.
Current
3 A max.
Total branch
line length
Section 2-2
8 A
3 A
capacity
Current
37