Omron 3G8F7-CRM21 User Manual page 220

Wiring for Power Supply
Master Board
Communications
power supply
Power
supply
Communications
power supply
Power
supply
Precautions for Correct Use
Using round cables II,
Flat Cables I or Flat
Cables II
200
Using a Repeater Unit
BS
BS
BS
BDH
Round Cable I
BDL
BS
Repeater
Overcurrent
protection*
Port 1
(current limit: 4 A)
BS+1
V
BDH1
Open Type
Connector BDL1
G
BS-1
Trunk line
Round Cable I
Repeater
Overcurrent
protection*
Port 1
(current limit: 4 A)
V BS+1
BDH1
Open Type
BDL1
Connector
G
BS-1
Round Cable I
Terminating
Resistor
Depending on the I/O device to which the Slave Unit is connected, an I/O
power supply connected to a multi-power supply Slave Unit may be a source
of noise. Even when the communications power is supplied collectively to all
Slave Units, a separate I/O power supply must be provided so that noise does
not affect the network.
The communications power to Slave Units is supplied through a round cable
II, Flat Cable I or Flat Cable II.
Therefore no separate wiring is required for a communications power supply
to Slave Units. The communications power supply can be shared by all Slave
Units within the same trunk line or sub-trunk line. The I/O power, however,
must be supplied separately to the Slave Units which need I/O power, i.e.,
multi-power supply Slave Units.
* 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.
Communications
Overcurrent
power supply
protection*
(current limit: 4 A)
V
Power
supply
G
Port 2
BS+2
BDH2
BDL2
BS-2
Slave Unit
I/O power supply
V
Power
supply
G
Communications
power supply Overcurrent
protection*
(current limit: 4 A)
V
Power
supply
G
Port 2
BS+2
BDH2
BDL2
BS-2
Slave Unit
I/O power supply
V
Power
supply
G
Section E-5
Round Cable I
Sub-trunk
line
Terminating
Resistor
Open Type
Open Type
Connector
Connector
Slave Unit
Multi-power
Multi-power supply
supply
V G
V G
Round Cable I
Sub-trunk
line
Terminating
Resistor
Open Type
Open Type
Connector
Connector
Slave Unit
Multi-power
Multi-power supply
supply
V G V G