Omron 3G8F7-CRM21, User Manual

Page: 225 / 238

205
Wiring for Power Supply
Section E-5
Note Depending on the I/O device to which the Slave Unit is connected, an I/O
power supply connected to a multi-power supply Slave Unit may be a source
of noise. Even when the communications power is supplied collectively to all
Slave Units, a separate I/O power supply must be provided so that noise does
not affect the network.
E-5-5 Precautions in Supplying Power to Slave Units
Attentions should be paid for allowable currents of cables and Connectors as
well as for voltage drop, and for capacity and location of power supplies, when
the communications power or the I/O power is supplied.
BS+2
BS-2
BDH2
BDL2
BS+1
BS+2
BS-2
BS+2
BS-2
BDH2
BDL2
BS+1
BS+2
BS-2
BDH
BDL
BDH BDL BDH BDL BDL BDH
BDH BDL BDH BDL BDH BDL
BDL1
BS-1
BDH1
BDL1
BS-1
BDH1
Overcurrent
protection*
(current limit: 4 A)
I/O power supply
Trunk line
Multi-power supply
Slave Unit
Round cable I
Terminating
Resistor
* 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.
Slave Unit
Terminating
Resistor
Terminating
Resistor
Overcurrent
protection*
(current limit: 4 A)
Power
supply
V
G
Round cable I
Open Type
Connector
Multi-power
supply
Master Board
Communications power supply connector
Shared communications
and I/O power supply
Round Cable II, Flat Cable I, or Flat Cable II
Open Type
Connector
Power
supply
V
G
Power
supply
V
G
Slave Unit
Slave Unit
Slave Unit
Slave Unit
V G V G
Shared communications
and I/O power supply
Branch
lines
Sub-trunk line
Sub-trunk line
Branch
lines
Round Cable I
Round Cable II, Flat Cable I, or Flat Cable II
Slave Units
with network power supply
Slave Units
with network power supply
Repeater
Unit
Port 1
Port 2
Repeater
Unit
Port 1
Port 2
Port 1: Upstream
Port 2: Downstream
Port 1: Upstream
Port 2: Downstream
BS
−
BS
−
BS
+
BS
+
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−
BS
+
BS
−