Omron 3G8F7-CRM21, User Manual

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176
Wiring for a CompoNet Network
Section E-3
Flat Cable II
Attach a DCN5-BR4 Flat Connector II Plug to a DCN5-TR4 Flat Connector II
Socket having an internal stopper.
E-3-8 Connection Locations for Terminating Resistors
A Terminating Resistor must always be connected to and located at the
opposite end of the trunk line or a sub-trunk line from the Master Board or a
Repeater Unit.
Note Do not connect the Terminating Resistor at the same end of the lines as the
Master Board.
When there is a branch near the end of the trunk line or a sub-trunk line, a
Terminating Resistor is connected at the farthest end of the trunk line from the
Master Board.
DCN5-TR4 Flat
Connector II Plug DCN5-TR4 Flat
Connector II Socket
There must be only one Terminating
Resistor that is connected at the opposite
end of the trunk line from the Master Board.
There must be only one Terminating
Resistor that is connected at the
opposite end of the sub-trunk line
from a Repeater Unit.
When there is a branch near the end
of line, make sure the cable length
a
is greater than length b . (a > b)
Repeater Unit
Master Board
Terminating Resistor
Trunk line
Sub-trunk line
Terminating Resistor
a
b
Slave Unit
Slave Unit
Slave Unit
Do not connect the Terminating
Resistor at the same end of the
line as the Repeater Unit.
The Master Board must be connected
to and located at the end of the trunk line.
Do not connect the Terminating Resistor
at the same end of the line as the Master
Board.