94
Power Supply Wiring Section 4-4
With Repeater Units
Note (1) 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.
(2) 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 net-
works. The quality of communications may decrease and normal remote
I/O communications may not be possible.
(3) 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.
V
G
BS-
BS+
BS+
BS-
BDH
BDL
V
G
BS- 2
BS+ 2
BS+ 2
BS- 2
BDH 2
BDL 2
BS+ 1
BS- 1
BDH 1
BDL 1
BS- 2
BS+ 2
BS+ 2
BS- 2
BDH 2
BDL 2
BS+ 1
BS- 1
BDH 1
BDL 1
VVG G
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
V
G
V
G
I/O power supply
Trunk line
Slave Unit
Terminating
Resistor
Round Cable II, Flat Cable I,
or Flat Cable II
Slave Unit
Slave Unit
Slave Unit
Terminating
Resistor
Terminating
Resistor
Overcurrent
protection
(current limit: 4 A)
Overcurrent
protection
(current limit: 4 A)
Overcurrent
protection
(current limit: 4 A)
Power
supply
Power
supply
Power
supply
Power
supply
Multi-power
supply
Communications
power supply
Master Unit
Branch
lines
Slave Unit
Slave Unit
Downstream port communications power supply connector
Communications power supply connector
Branch
lines
Sub-trunk line
Round Cable II, Flat Cable I,
or Flat Cable II
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.
Shared communications
and I/O power supply
Shared communications
and I/O power supply
Sub-trunk
line
Multi-power
supply
Slave Units with
network power supply
Round Cable II, Flat
Cable I, or Flat Cable II
Repeater
Unit
Port 1
Port 2
Repeater
Unit
Port 1
Port 2
Port 1: Upstream
Port 2: Downstream
Port 1: Upstream
Port 2: Downstream
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