93
Power Supply Wiring Section 4-4
Round Cable II,
Flat Cable I, or
Flat Cable II
The communications power to Slave Units is supplied through a Round Cable
II, Flat Cable I or Flat Cable II cable. Therefore there is no need to provide a
communications power supply for Slave Units separately. The communica-
tions power supply can be shared by all Slave Units within the same trunk line
or sub-trunk line. The I/O power must be supplied separately to the Slave
Units which need I/O power, i.e., Slave Units with a multi-power supply.
Without Repeater Units
Slave Unit
Slave Unit
Slave Unit
Slave Unit
Terminating
Resistor
Master Unit
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
BDH
BDL
BS+
BS-
V
G
BS-
BS+
BS+
BS-
BDH
BDL
Overcurrent
protection
(current limit: 4 A)
Trunk line
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.
Power
supply
Communications
power supply
Branch
lines
Round Cable II, Flat Cable I, or Flat Cable
II
Slave Units
with network
power supply
Communications
power supply
connector
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