88
Power Supply Wiring Section 4-4
■ I/O Power
Power is supplied separately from the communications power to the I/O power
supply terminals on each Unit. To prevent noise generation, the power must
be supplied separately from the communications power supply.
Round Cable II, Flat Cable
I, or Flat Cable II
■ Communications Power
Power is supplied through the communications power supply connector on the
Master Unit. Power is also supplied through the downstream port of the com-
munications power supply connector on each Repeater Unit.
■ I/O Power
Power is supplied separately from the communications power to the I/O power
supply terminals on each Unit.
Master Unit
BS+
BDH
BDL
BS-
BS+
BS-
BS
+
BD
H
BD
L
BS
-
V
G
Overcurrent protection
(current limit: 4 A)
Round Cable I
I/O power
supply
24 VDC
I/O power
supply terminals
Communications
power supply terminals
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.
Communica-
tions power
supply
24 VDC
Communications power supply connector on Master Unit
or downstream
ort's communications
ower su
l
connector on Re
eater Unit
Master Unit or
Repeater Unit
BS+
BDH
BDL
BS-
BS+
BS-
BS
+
BD
H
BD
L
BS
-
V
G
Round Cable II, Flat
Cable I, or Flat Cable II
Overcurrent protection
(current limit: 4 A)
I/O power
supply
24 VDC
I/O power
supply terminals
Communications
power supply terminals
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.
Communica-
tions power
supply
24 VDC
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