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2-3
2-1-2 Connections
H Trunk and Drop Lines
The trunk line is a cable to which Terminating Resistors are connected at the ends. Drop lines are cables
that branch from the trunk lines. A special 5-wire cable is used for both the trunk lines and the drop lines.
H Branching Patterns
Branching Patterns from Trunk Line
Drop line
T-branch Tap
Trunk line
Node
Trunk line
T-branch Tap
Trunk line
Node
T-branch Tap
Node
Node
Trunk line
Multi-drop
Trunk line
Node
Trunk line
1.One drop line from
trunk line
2.Three drop lines (maximum)
from trunk line
3.Node connected directly to
trunk line
Branching Patterns from Drop Line
Drop line
T-branch Tap
Trunk line
Node
Trunk line
T-branch Tap
Trunk line
Node
T-branch Tap
Node
Node
Trunk line
Multi-drop
Trunk line
Node
Trunk line
4 One drop line from
drop line
5.Three drop lines (maximum)
from drop line
6.Node connected directly to
drop line
Various forms of connection can be used on the same Network, as shown in the
following diagram. Any number of nodes up to 63 can be connected onto a single
drop line.
If a C200HX/HG/HE or a C200HS PC is being used without a Configurator to
allocate remote I/o, the maximum number of nodes that can be connected to a
single drop line is 51 for C200HX/HG/HE PCs and 33 for C200HS PCs.
Note Design the Inverter wiring for T-branch wiring purposes using Thin
Cables.
Communications
power supply
Terminating
Resistor
Node Node
Drop line
NodeNode
Drop
line
Trunk line
24 VDC
Node
Node
Node
Node
Node
Node
Power Supply Tap
or T-branch Tap
Trunk line
Drop
line
Terminating
Resistor
CompoBus/D Communications Line Design Chapter 2