Omron 3G8F7-CRM21, User Manual

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202
Wiring for Power Supply
Section E-5
Using a Repeater Unit
Precautions for Correct Use
•
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.
•
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 networks. The
quality of communications may decrease and normal communications may
not be possible.
•
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
V V G G
BDH BDL BDH BDL BDH BDL BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BDH BDL
BDH BDL BDH BDL
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 Board
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