Omron CJ Series Operation Manual page 145

With Repeater Units
Master Unit
BS+
BS-
BS+
BDH
BDL
BS-
Trunk line
Precautions for Correct Use Precautions for Correct Use
• Do not supply communications power from more than one location for the trunk line or for any
one sub-trunk line. The quality of communications may decrease and normal communications
may not be possible.
• Do not supply communications power from a single power supply to the trunk line and a sub-
trunk line or to two sub-trunk lines. Also do not use a single communications power supply for
two or more CompoNet networks. The quality of communications may decrease and normal
communications may not be possible.
• The I/O power supply to multi-power supply Slave Units may be a source of noise depending
on the connected devices. Even when supplying the communications power supply together to
all Slave Units, use a separate I/O power supply so that noise does not affect the network.
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Communications power supply connector
Overcurrent
Communications
protection (*1)
power supply
(current limit: 4 A)
V
Power
supply
G
Downstream port communications power supply connector
Overcurrent
protection (*1)
Repeater
(current limit: 4 A)
Unit
BS+ 2
BS- 2
Port 1
BS+ 1
Port 2
BDH 1
BS+ 2
BDL 1
BS- 1 BDH 2
BDL 2
BS- 2
Branch
Port 1: Upstream
lines
Port 2: Downstream
Round Cable II, Flat
Cable I, or Flat Cable II
Overcurrent
protection (*1)
(current limit: 4 A)
Repeater
Unit
BS+ 2
BS- 2
Port 1
BS+ 1
Port 2
BDH 1
BS+ 2
BDL 1
BDH 2
BS- 1
BDL 2
BS- 2
Branch
lines
Port 1: Upstream
Port 2: Downstream
Terminating
Slave Unit
Resistor
I/O power supply
V
Power
G
supply
*1: When complying with UL standards, install a
device to limit the current between the external
power supply and the Unit to 4 A or less for
the communications power supply.
Shared communications
and I/O power supply
V
Power
supply
G
Round Cable II, Flat Cable I,
or Flat Cable II
Sub-trunk
line
Slave Unit Slave Unit
Shared communications
and I/O power supply
V
Power
supply
G
Round Cable II, Flat Cable I,
or Flat Cable II
Sub-trunk line
Multi-wiring
Connector
Slave Unit
Slave Unit
V G V G
Multi-power
supply
4 Installation and Wiring
Terminating
Resistor
Slave Units with
network power supply
Slave Unit
Terminating
Resistor
Slave Units with
network power supply
4
4-37