Omron 3G8F7-CRM21, User Manual

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Wiring for a CompoNet Network
Section E-3
E-3 Wiring for a CompoNet Network
A CompoNet Network requires wiring of following lines.
• Two communications signal lines:
BDH (or communications data high) and BDL (or communications data
low),
• Two communications power supply lines:
one for communications and the other for internal circuits of Slave Units.
The terminals are BS+ (or positive side of communications power supply)
and BS
−
(or negative side of communications power supply).
Wiring method differs by the type of used cables.
E-3-1 Wiring Round Cable I
The two communications signal lines are connected in parallel between the
Master Board or a Repeater Unit and multiple Slave Units.
• A DCN4-TB4 Open Type Connector is used to connect communications
cables to the Master Board or a Repeater Unit and to the Slave Units.
• The two communications power supply lines are connected to each Slave
Unit. They are different cables from the communications lines. The
communications power supply lines are to supply 24-VDC
communications power.
• No power line is connected to the Master Board or a Repeater Unit.
• A DRS1-T Terminating Resistor must be connected at the end of the
network.
Terminating
Resistor (121
Ω
)
Communications
Communications
Slave Unit Slave Unit
Slave Unit
Communications
power supply, 24 VDC
Communications
power supply, 24 VDC
Communications
power supply, 24 VDC
BDL
BDH
BS
−
BS+
BDL BDH
BS
−
BS+ BS
−
BS+ BS
−
BS+
BDL BDH BDL BDH
Master Board or
Repeater Unit
Open Type Connector
Communications signal lines (2)
Relay terminal block
Commu-
nications
Open Type Connector