ABB ICMK14F1

Advant Controller AC 31 / Issued: 01.99 3 – 3 Technical specifications
3
3.2 Technical specifications of the CS31 system bus
Type
RS 485 multipoint serial interface
Mode
Half-duplex
Number of connection points
1 master
max. 31 slaves
General data
- Cross-section
- Twists
- Resistance
- Impedance specification
- Capacity
- Shielding
- Line termination
Twisted pair
0.22...0.8 mm²
> 10 per metre
≤ 100 Ω/km
100 to 150 Ω
< 150 nF/km
Braiding
Resistance 120 Ω, ¼ Watt, connected
to each end of the bus
Protocol
CS31 (master/slave)
Data transmission control
CRC
Maximum length
up to 500 m without amplifier
up to 2000 m with 3 amplifiers
(NCB or NCBR)
Bus redundancy
yes, with NCBR (bus amplifier)
Isolation
yes, by optocoupler
Refresh time
2 ms minimum
typically 12 ms with 31 AC31 connection
points
Baud rate
187.5 kBauds