Omron CRT1 - 10-2008 Operation Manual page 64

Communications Cable Wiring Examples
Master Unit or
Repeater Unit
Communications
power
BS+
BDH
BDL
BS-
Open Connector
Open Connector
Master Unit or
Repeater Unit
Communications
power
BS+
BDH
BDL
BS-
Open Connector
Open Connector
Communications
24-VDC
power supply
communications
connector
power supply
Two communications
Relay terminal block
signal lines
Slave Unit
BS+ BDH BDL BS-
Slave Units can also be connected in parallel using multidrop connections.
Two communications
signal lines
Two communications
power lines
BS-
BS+ BDH BDL BS+
Slave Unit
Two communications
power lines
Slave Unit
BS+ BDH BDL BS- BS+
BS-
BDH BDL BS+ BDH
Slave Unit
Section 2-4
Terminating Resistor
Slave Unit
BDH BDL BS-
Terminating Resistor
BS-
BDL
Slave Unit
(121 Ω)
(121 Ω)
41