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System Configuration
Section 2-2
• When the system operates in Long-distance Communications Mode with
Special Flat Cable or 4-conductor VCTF cable used, there will be no need
to distinguish main and branch lines for the system. It is not, however,
possible to use more than one type of cable in the same CompoBus/S
system.
• The maximum length of cable used for the CompoBus/S system is 200 m
regardless of the type of communications cable.
• Only a single terminator farthest from the Master is required regardless of
the position the Master is connected to the communications cable.
• More than a single Master cannot be connected to the CompoBus/S Sys-
tem. The possible range of node numbers varies with the type of Master
and settings in the Master. Refer to
2-1 Communications Specifications
Specifications
for details.
Connection Methods
The Master and Slaves can be connected by either the T-branch method or
the multidrop method.
T-branch Method
In the T-branch method, a branch connector, a commercially available termi-
nal block, or a T-joint is used to create a branch from the main line and con-
nect a Slave when the main line is distinguished from branch lines. The
maximum length of the branch line varies according to the communications
mode and the type of cable used. For details, refer to
. A secondary branch cannot be connected to the branch line when the
main line is distinguished from branch lines.
The actual wiring for T-branch connections is given next.
Master
Communica-
tions Power
Supply
Slave
Terminator
Power supply cable
T: T-branch connection
M: Multidrop connection
Communications cable
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Main line
Branch line
System with Distinction between
Main and Branch Lines
System with No Distinction between
Main and Branch Lines
Node
Cable
Cable