OPERATION MANUAL CompoBus/S

System Configuration Section 2-2
Slave
Main line
2-2-2 Maximum Cable Length
tidrop method. When the main line is distinguished from branch lines, Slaves
must be connected to the main line.
System with Distinction between
Main and Branch Lines
Master
Branch line length
L 1
System with No Distinction between
Main and Branch Lines
Node
Cable
The actual wiring for multidrop connections is shown in the following diagram.
The Slave is connected to the signal wires from the Master side of the system
as well as the signal wires from the terminator side of the system.
Main line cable from the
Master or previous Slave
Connects to the Connects to the
Slave's BD L terminal. Slave's BD H terminal.
Communications cable
Low side (BD L)
Communications cable
High side (BD H)
Main line cable to the
next Slave or terminator
The main line length is the total length of the cable connecting the Master and
the terminator at the farthest end of the system. The branch line length is the
length of a cable connecting a Slave to the main line and the total branch line
length is the sum of lengths of all of the branch lines in the system.
When the system has no main line distinguished from the branch lines, the
communications cable can be connected with no particular restrictions, provided
that the total length of communications cable is a maximum of 200 m.
Main line
Slave Slave L3 L4 Slave
L5 Slave Slave Slave Slave Slave
Total branch line length = L 1 + L 2 + L 3 + L 4 + L 5
Communication
mode
High-speed Communications
Mode
L 2
Terminator
The maximum main line, branch line, total branch line, and total cable lengths
depend on the type of cable and number of Slaves being used, as shown in
the following table.
Cable type Cable length
Main line Branch line Total of branch lines
2-conductor VCTF cable 100 m max. 3 m max. 50 m max.
4-conductor VCTF cable 30 m max.
(See note.)
Flat 30 m max.
(See note.)
3 m max. 30 m max.
(See note.)
3 m max. 30 m max.
(See note.)
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