Omron CRT1 - 10-2008, Operation Manual

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Communications Cable Wiring Examples Section 2-4
2-4 Communications Cable Wiring Examples
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.
2-4-1 Round Cable I
• 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.
Slave Units can also be connected in parallel using multidrop connections.
BDL BDH BDL BDH BDL
BDH
BS
−
BS+ BS
−
BS+ BS
−
BS+
Terminating Resistor
(121
Ω
)
Two communications
signal lines
Communications
Communications
Slave Unit
Slave Unit
Slave Unit
24-VDC
communications
power supply
24-VDC
communications
power supply
24-VDC
communications
power supply
Master Unit or
Repeater Unit
Open Connector
Open Connector
Relay terminal block
Commu-
nications
BS+
BS
−
BDL
BDH