Communications Cable Wiring Examples; Round Cable I - Omron CRT1 - 10-2008 Operation Manual

Communications Cable Wiring Examples

2-4

Communications Cable Wiring Examples

2-4-1

Round Cable I

Master Unit or
Repeater Unit
BS+
BDH
BDL
BS−
Open Connector
Open Connector
The following wiring is required in a CompoNet Network.
• Two communications signal lines (communications data): BDH (communi-
cations data high) and BDL (communications data low)
• Two communications power supply lines (power for communications and
internal Slave Unit circuits): BS+ (communications power supply plus
side) and BS − (communications power supply minus side)
The wiring method depends on the type of cable that is used.
• Connect the two communications signal lines in parallel between the Mas-
ter Unit or Repeater Unit and multiple Slave Units.
• Use Open Type Connectors (DCN4-TB4, for connecting Units) to connect
Communications Cables to Master Units, Repeater Units, and Slave
Units.
• To supply the communications power (24 VDC), connect the two commu-
nications power supply lines to each Slave Unit separately from the Com-
munications Cables.
• Power is not supplied to the Master Unit or Repeater Units.
• A Terminating Resistor (DRS1-T) must be connected at the end of the
network.
Relay terminal block
Two communications
signal lines
Communications
Commu-
nications
Slave Unit
BS+
BS−
BDH BDL
24-VDC
communications
power supply
Slave Units can also be connected in parallel using multidrop connections.
Communications
Slave Unit
BS+ BS− BS+
BDH BDL
24-VDC
communications
power supply
Section 2-4
Terminating Resistor
(121 Ω)
Slave Unit
BS−
BDH BDL
24-VDC
communications
power supply
39