DCN4-BR4D Omron, DCN4-BR4D Datasheet - Page 63

• 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

Network Configuration
2-2-10 Grounding Methods
Proper Grounding
Practices
42
Shield (S)
Example A
CAN H
CAN L
V+
V−
Power Supply Tap
Communications
power supply
V+ V− FG
V+ V− S
Note The low voltage limit for the internal circuit power supply is higher than the low
voltage limit for the communications power supply. To meet the voltage speci-
fications for the internal circuit power supply, be sure to follow the specifica-
tions listed in SECTION 3 Communications Power Supply Methods.
Ground the DeviceNet shield wire to 100 Ω max. at one and only one point in
the network. Grounding more than one point can cause ground loops and
noise in the network.
Generally, the communications power supply’s FG terminal is grounded to
100 Ω max. and connected to the V- terminal and the Power Supply Tap’s
shield (S) terminal, as shown in example A below. It is also acceptable to con-
nect the communications power supply’s FG terminal and the V- terminal and
ground the network from the Power Supply Tap’s shield (S) terminal, as shown
in example B below.
In either case, ground the network as close to the center of the network as
possible.
When there are two or more communications power supplies in the network,
determine which power supply is closest to the center of the network. Connect
V+
CAN H
Shield (S) DeviceNet
CAN L
V−
Correct
Incorrect
Ground to
100 Ω max.
Configuration A:
Configuration B:
Shared communications
and internal circuit
power supply
Shared communications
and internal circuit
power supply
cable
Shield (S)
CAN H
Example B
CAN L
Communications
power supply
V+
V−
Communications
power supply
V−
Vv
Power Supply Tap
V+
V+
Communications
power supply
V+ V− FG
24 VDC
−
V+ V− S
Internal circuit
power supply
24 VDC
−
Internal circuit
power supply
+
+
Ground to
100 Ω max.
V+
CAN H
CAN L
V−
Shield (S)
Communications
power supply
V−
Communications
power supply
V−
V+
V+
DeviceNet
cable
24 VDC
−
24 VDC
−
Internal circuit
power supply
Internal circuit
power supply
+
Section 2-2
+