Omron 3G8F7-CRM21, User Manual

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200
Wiring for Power Supply
Section E-5
Using a Repeater Unit
Precautions for Correct Use
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.
Using round cables II,
Flat Cables I or Flat
Cables II
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.
V G
I/O power supply
Trunk line
Multi-power supply
Slave Unit
Round Cable I
Terminating
Resistor
* 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.
BDL
BS
+
BS
+
BS
−
BS
−
BDH
BDL2
BS+2
BS-2
BDH2
BS+1
BDL2
BS+2
BS-2
BDH2
BS+1
BDH BDL BDH BDL
BDL1
BS-1
BDH1
BDL1
BS-1
BDH1
BDH BDL BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BDH BDL
Slave Unit
Slave Unit
Slave Unit
V G
V G
Power
supply
V
G
V
G
Power
supply
Terminating
Resistor
Terminating
Resistor
V G
Overcurrent
protection*
(current limit: 4 A)
Overcurrent
protection*
(current limit: 4 A)
Overcurrent
protection*
(current limit: 4 A)
Overcurrent
protection*
(current limit: 4 A)
Power
supply
V
G
Power
supply
V
G
Power
supply
V
G
Power
supply
V
G
Round Cable I
Open Type
Connector
Open Type
Connector
Open Type
Connector
Open Type
Connector
Multi-power
supply
Open Type
Connector
Multi-power
supply
Multi-power supply
Open Type
Connector
Round Cable I
I/O power supply
Communications
power supply
Communications
power supply
Communications
power supply
Communications
power supply
Round Cable I
Master Board
Sub-trunk
line
Round Cable I
Repeater
Port 1
Port 2
Repeater
Port 1
Port 2
Sub-trunk
line