Cs 31 Bus Technical Specifications - ABB AC 31 Technical Manual

2. CS 31 bus technical specifications

ABB Control - AC 31
1SBC 260400 R1001-b 06.99
Technical specifications
Type
Mode
Number of connection points
Support
- Section
- Twists
- Resistance
- Impedance specification
- Capacity
- Shielding
- Line termination
Protocol
Transmission control
Maximum length
Bus redundancy
Isolation
Refresh time
Speed
RS 485 multipoint serial interface
Half-duplex
1 single master
max. 31 slaves
Shielded twisted pair
0.22...0.8 mm²
> 10 per meter
≤ 100 Ω / km
100 à 150 Ω
< 150 nF / km
Braiding
Resistance 120 Ω, ¼ Watt, connected
to each extremity of the bus
ABB CS 31 (master/slave)
or MODBUS slave
CRC
up to 500 m without amplifier
up to 2000 m with 3 amplifiers
(NCB or NCBR)
yes with NCBR
yes by optocoupler
2 ms minimum
typically 12 ms with 31 CS 31 interfaces
187.5 kBauds
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