Omron 3G8F7-CRM21 User Manual page 222

Wiring for Power Supply
Master Board
BS
BS
BS
BDH
BDL
BS
Trunk line
Precautions for Correct Use
202
Using a Repeater Unit
Communications power supply connector
Overcurrent
Communications
protection*
power supply
(current limit: 4 A)
V
Power
supply
G
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
Port 1: Upstream
lines
Port 2: Downstream
Round Cable II, Flat
Cable I, or Flat Cable II
Overcurrent
protection*
(current limit: 4 A)
Repeater
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
lines
Port 1: Upstream
Port 2: Downstream
Terminating
Resistor
I/O power supply
V
Power
G
supply
•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.
* 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.
Downstream port communications power supply connector
Overcurrent
Shared communications
protection*
and I/O power supply
(current limit: 4 A)
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
Sub-trunk line
Multi-power
supply
Slave Unit
Slave Unit
V G V G
Multi-power
supply
Section E-5
Terminating
Resistor
Slave Unit
Round Cable II, Flat Cable I,
or Flat Cable II
Terminating
Resistor
Slave Units with
network power supply
Slave Unit