Omron CRT1 - 10-2008 Operation Manual page 104

Power Supply Wiring
Not Using Repeater Unit
Using Repeater Units
Note
Communications power
supply connector
Overcurrent
protection (See note.)
(current limit: 4 A)
Master Unit
BS+
BS−
BS+
BDH
BDL
BS−
Branch
line
Slave
Units
Communications power
supply connector
Overcurrent
protection (See note.)
(current limit: 4 A)
Master Unit
BS+
BS−
BS+
BDH
BDL
BS−
Repeater Unit
PORT1
(upstream)
BS+ 1
BDH 1
BDL 1
BS− 1
Trunk line
Round cable II or
Flat Cable I/II
Repeater Unit
PORT1
(upstream)
BS+ 1
BDH 1
BDL 1
BS− 1
Terminat-
ing Re-
sistor
I/O power supply
(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 will
decrease and normal communications may not be possible.
Communications
power supply
V
Power
supply
G
Trunk line
Slave
Units
Communications
power supply
Note:
V
When complying with UL standards, install a
Power
device to limit the current between the external
supply
power supply and the Unit to 4 A or less for the
G
communications power supply.
Downstream port communica-
tions power supply connector
Overcurrent
protection (See note.)
(current limit: 4 A)
BS+ 2
BS− 2
POR 2 T
(downstream)
BS+ 2
BDH 2
BDL 2
BS− 2
Sub-
Branch line
trunk line
Slave
Units
Overcurrent
protection (See note.)
(current limit: 4 A)
BS+ 2
BS− 2
PORT2
(downstream)
BS+ 2
BDH 2
BDL 2
BS− 2
Sub-
Branch line
trunk line
Slave Units
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 II or Flat Cable I/II
Terminating
Resistor
Network power
supply Slave
Units
Slave
Slave
Units
Units
Communications power
supply and I/O power
supply (shared)
V
Power
supply
Round cable II or
G
Flat Cable I/II
Termi-
nating
Resis-
tor
Network
power
Slave
supply
Slave
Units
Slave
Units
Units
Communications power
supply and I/O power
supply (shared)
V
Power
supply
Round cable II or
Flat Cable I/II
G
Termi-
Multidrop
nating
Connector
Resis-
tor
Network
power
Slave Units
Slave
supply
Units
Slave
Units
Multi-power
supply
Slave Unit
81