Omron CRT1 - 10-2008 Operation Manual page 103

Power Supply Wiring
Using Repeater Units
Master Unit
BS+
BS−
BS+
BDH
BDL
BS−
Overcurrent
Communications
protection
power supply
(See note.)
(current limit: 4 A)
V
Power
supply
G
Trunk line
Overcurrent
Communications
protection
power supply
(See note.)
(current limit: 4 A)
V
Power
supply
G
Note
Using Round Cable II
or Flat Cable I/II
80
Round cable I
Repeater Unit
PORT1
(upstream)
BS+ 1
PORT2
(downstream)
BDH 1
Open Type
BS+ 2
Connector
BDL 1
BDH 2
BS− 1
BDL 2
BS− 2
I/O power supply
Round cable I
Repeater Unit
PORT1
(upstream)
BS+ 1
PORT2
(downstream)
BDH 1
Open Type
BS+ 2
Connector
BDL 1
BDH 2
BS− 1
BDL 2
BS− 2
Round cable I
Terminat-
ing Resis-
I/O power supply
tor
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 commu-
nications power supply together to all Slave Units, use a separate I/O power
supply so that noise does not affect the network.
When round cable II or Flat Cable I/II is used, the Slave Unit communications
power is supplied through the Flat Cable I/II. There is no special wiring
required to provide the communications power supply to individual Slave
Units. The same communications power supply is shared for the entire trunk
line or sub-trunk line.
For Slave Units requiring an I/O power supply (i.e., multi-power supply Slave
Units), however, I/O power must be supplied separately.
Communications
power supply
Overcurrent
protection
(See note.)
(current limit: 4 A)
V
Power
supply G
Sub-trunk
line
Slave Unit
V
Power
supply
G
Communications
power supply Overcurrent
protection
(See note.)
(current limit: 4 A)
V
Power
supply
G
Sub-trunk
line
Slave Unit
V
Power
supply
G
Section 3-5
Note:
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.
Round cable I
Open Type
Connector
Slave Unit
Multi-power
Multi-power
supply
supply
Slave Unit
Slave Unit
Round cable I
Open Type
Connector
Slave Unit
Multi-power
supply
Slave Unit
Termi-
nating
Resistor
Open Type
Connector
Termi-
nating
Resistor
Open Type
Connector
Multi-power
supply
Slave Unit