29
System Configuration
Section 2-2
tidrop method. When the main line is distinguished from branch lines, Slaves
must be connected to the main line.
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.
2-2-2
Maximum Cable Length
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, pro-
vided that the total length of communications cable is a maximum of 200 m.
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.
Slave
Main line
System with Distinction between
Main and Branch Lines
System with No Distinction between
Main and Branch Lines
Node
Cable
Connects to the
Slave's BD L terminal.
Communications cable
High side (BD H)
Communications cable
Low side (BD L)
Connects to the
Slave's BD H terminal.
Main line cable from the
Master or previous Slave
Main line cable to the
next Slave or terminator
Main line
Master
Termi-
nator
Slave Slave
Slave
Slave
Slave
Slave Slave
Slave
Branch line length
Total branch line length = L
1
+ L
2
+ L
3
+ L
4
+ L
5
L
1
L
2
L
3
L
4
L
5
Communication
mode
Cable type
Cable length
Main line
Branch line
Total of branch lines
High-speed Com-
munications Mode
2-conductor VCTF cable
100 m max.
3 m max.
50 m max.
4-conductor VCTF cable
30 m max.
(See note.)
3 m max.
30 m max.
(See note.)
Flat
30 m max.
(See note.)
3 m max.
30 m max.
(See note.)
