Omron CRT1 - 10-2009, Operation Manual

Page: 120 / 675

96
Power Supply Wiring
Section 3-5
Using Round Cable I and Round Cable II or Flat Cable I/II Together
One or more Repeater Units can be used in a CompoNet Network to use both
round cable I and round cable II, or round cable I and Flat Cable I/II under the
same Master Unit.
Note 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.
3-5-5 Precautions when Supplying Communications Power
When supplying communications power and I/O power, the allowable currents
of cables and connections, the voltage drop, and the capacity and location of
power supplies must be considered.
Allowable Current
Restrictions
Do not allow the total current consumption of all Slave Units to exceed the
allowable current of the communications cables and connectors. Exceeding
the allowable current may result in heating or burnout of the cables or connec-
tors.
BS
+ BD
H
BD
L
BS
-
V
G
BS
+ BD
H
BD
L
BS
-
BS+ BD
H
BD
L
BS
-
BS
+ BD
H
BD
L
BS
- BS
+ BD
H
BD
L
BS
-
V
G
BS+ BD
H BD
L BS-
BDH 1
BDL 1
BS- 1
BS+ 1
BDH 2
BDL 2
BS- 2
BS+ 2
PORT1
PORT2
BS- 2
BS+ 2
V
G
BDH 1
BDL 1
BS- 1
BS+ 1
BDH 2
BDL 2
BS- 2
BS+ 2
PORT1
PORT2
BS- 2
BS+ 2
BDH
BDL
BS-
BS+
BS-
BS+
Master Unit
Terminat-
ing Resis-
tor
Termi-
nating
Resis-
tor
Communications power
supply and
I/O power supply (shared)
Sub-
trunk
line
Branch line
Multi-power
supply Slave
Unit
Round cable I
Round cable I
Downstream port communications power supply connector
Repeater Unit
Power
supply
Multidrop
Connector
Open Type
Connector
Repeater Unit
Communications power
supply and
I/O power supply (shared)
Branch line
Round cable I
I/O power supply
Power
supply
Network
power supply
Slave Units
Termi-
nating
Resis-
tor
Network
power supply
Slave Units
Power
supply
Open Type
Connector
Slave Unit
Trunk line
Slave Unit Slave Unit
Slave Unit Slave Unit Slave Unit
(upstream)
(downstream)
(upstream)
(downstream)
Sub-
trunk
line
Overcurrent
protection
(See note.)
(current limit: 4 A)
Note:
When using the UL standards, please install a
unit to restrict current between the external
power supply and this unit to 4 A. (Only
communications power supply)
Overcurrent
protection
(See note.)
(current limit: 4 A)
Round cable II or Flat Cable I/II
Round cable II or Flat Cable I/II