Omron CRT1 - 10-2008 Operation Manual page 100

Power Supply Wiring
Round Cable II or Flat
Cable I/II
Master Unit
Communi-
cations
power
supply
Before connecting the power supply, first connect a DCN4-TB4 Open Type
Connector to the communications connector to convert it to a screw terminal
block.
Overcurrent
protection (See note.)
(current limit: 4 A)
24-VDC
+
communica-
tions power
−
supply
Note:
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.
When using a Repeater Unit, supply power through the BS+ and BS − termi-
nals of the Repeater Unit's PORT1 connector.
Overcurrent
protection (See note.)
(current limit: 4 A)
24-VDC
communica-
tions power
supply
Note:
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.
Connect a 24-VDC power supply to the Master Unit's communications power
supply connector (BS+ and BS − ). This provides communications power to
each Slave Unit and Repeater Unit connected by round cable II or Flat Cable
I/II. Connect only one communications power supply for the trunk line. The
cable between the communications power supply and the communications
power supply connector must be no longer than 3 m.
Communications
power supply,
24 VDC
Communications
power supply
connector
Overcurrent
protection (See note.)
(current limit: 4 A)
Round cable II or
Flat Cable I/II
Communications
connector
Slave Unit
When Repeater Units are used, communications power to sub-trunk lines is
supplied by the downstream port communications power supply connectors
(BS+ and BS − ) of the Repeater Units. The cable between the communica-
tions power supply and the communications power supply connector must be
no longer than 3 m.
BS+
BS-
Connect an Open Type
Connector here.
PORT1
BS
BS
Connect an Open Type Connector here.
Note:
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.
3 m max.
Slave Unit
Section 3-5
PORT2
Terminating Resistor
Slave Unit
77