● Install the lines in groups (power lines, power supply lines, signal lines, data lines).
● Use lines with braided cable shield for analog signals. Earth the shield on both sides and
make sure that no compensation currents flow through the cable shield. For this purpose,
use a potential equalization line with current carrying capacity, for instance on systems con-
sisting of several switchgear cabinets.
Further information concerning CS31 bus earthing:
1.3.2 CS31 bus system data
1.3.2.1 Wiring
Table 6: Bus line
Data Value
Configuration 2 cores, twisted, with common shield
Cross section > 0.22 mm² (24 AWG)
Recommendation: 0.5 mm² corresponds to Ø
0.8 mm
Twisting rate > 10/m (symmetrically twisted)
Core insulation Polyethylene (PE)
Resistance per core < 100 Ω/km
Characteristic impedance approx. 120 Ω (100 ... 150 Ω)
Capacitance between the cores < 55 nF/km (in case of higher capacitance
values, the maximum possible bus length is
reduced)
Terminating resistors 120 Ω ¼ W at both ends
Notes Cables with PVC core insulation and core
diameter of 0.8 mm can be used up to a
length of approx. 250 m. In this case, the ter-
minating resistor is 100 Ω. Cables with PE
core insulation can be used up to a length of
approx. 500 m.
The baud rate used on the CS31 bus is 187.5 kBaud.
1.3.2.2 Bus topology
A CS31 system bus always contains only one CS31 bus master to control the bus. Up to 31
CS31 slaves can be controlled by one bus. The CS31 bus master has no address, whereas the
CS31 slaves can accept addresses in the range from 0 - 61, depending on CS31 slave type.
Possible CS31 bus masters:
● 07KT94-ARC-AD, 07KT94
● 07KT98-ARC-AD, 07KT98
● 07KT98-ARC-DP-AD
● 07KT98-ARC-ETH-AD
● 07KT98-ETH-DP-AD
● 07KT98-ARC-ETH-DP-AD
System data and CS31 bus system data > CS31 bus system data
2018/09/243ADR010122, 8, en_US10
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