OPERATION MANUAL CompoBus/S

System Configuration Section 2-2
30
Communication
mode
Long-distance
Communications
Mode
Cable type Cable length
Main line Branch line Total of branch lines
2-conductor VCTF cable 500 m max. 6 m max. 120 m max.
4-conductor VCTF cable Total length of communications cable: 200 m max.
(with no distinction between main and branch lines)
Flat Total length of communications cable: 200 m max.
(with no distinction between main and branch lines)
Note If the number of connected Slaves does not exceed 16 when using the Highspeed
Communications Mode, the main line length can be up to 100 m and
the total branch line length can be up to 50 m (i.e., the same as for the VCTF
cable). An example is given below.
Refer to the following examples.
Example 1
Special Flat Cable Main line length: 100 m max.
Master
Branch
length:
3 m max.
L 1
Slave (8
outputs)
Slave (8
outputs)
Slave (8 outputs) × 5 Units Slave (8 inputs) × 5 Units Total branch line length: 50 m max.
Special Flat Cable
Master
Branch length:
3 m max.
L 1
L 2 L 5 L 6 L 7 L 10 L 11 L 12 L 13 L 14
Slave (16
outputs)
Slave (8
outputs)
Slave (8
inputs)
No. of Slave
Units
Number of I/O
points
Example 2
No. of Slave
Units
Number of I/O
points
Slave (8
inputs)
Slave (8
inputs)
8-input Slave × 5 Units + 8-output Slave × 5 Units + 16-input Slave
× 2 Units + 16-output Slave × 2 Units = 14 Slave Units
72 inputs and 72 outputs
Slave (16
inputs)
L 2 L 8 L 9 L 10 L 16
Slave (16
outputs)
Slave (16 outputs) × 8 Units
Slave (16
outputs)
Main line length: 100 m max.
Slave (16
inputs)
Slave (16
inputs)
Slave (16 inputs) × 8 Units
Slave (16
outputs)
Slave (16
inputs)
Slave (16
outputs)
Terminator
16-input Slave × 8 Units + 16-output Slave × 8 Units = 16 Slave
Units
128 inputs and 128 outputs
Slave (16
inputs)
Terminator
Total branch line length:
50 m max.
Do not mix 2-conductor VCTF, 4-conductor VCTF, and Special Flat Cables in
the same system.
Refer to the Appendix Standard Models for details on compatible communications
cables.
Note When 4-conductor VCTF or Special Flat Cable is used to supply the Slave’s
communications power, the length of the cable may be limited by current and
voltage drops in the cable and connectors. Refer to 2-3-3 Limitations of Communications
Cable Power Supply on page 35 for details.