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Power Supply Wiring Section 4-4
4-4-4 Communications Power Supply Wiring Example
Round Cable I When Round Cable I cables are used, the communications power cannot be
supplied through the communications cables. The power must be supplied to
each Slave and Repeater Unit through other cables. Furthermore, the I/O
power must be supplied separately to the Slave Units which need I/O power,
i.e., Slave Untis with a multi-power supply. There is no need, however, to pro-
vide an external communications power supply to the Master Unit.
Without Repeater Units
BS+
BS-
BS-
BS+
BDH
BDL
V
G
V
G
VG
BS-
BS+
BDH
BDL
BS-
BS+
BDH
BDL
VG
BS-
BS+
BDH
BDL
V G
Communications
power supply
Power
supply
I/O power supply
Trunk line
Multi-power supply
Multi-power supply
Slave Unit
Slave Unit
Slave Unit
Round cable I
Terminating
Resistor
Open Type
Connector
Open Type
Connector
Open Type
Connector
Power
supply
Multi-power supply
Master Unit
Overcurrent
protection
(current limit: 4 A)
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.
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