VLT
®
5000 INTERBUS
MG.10.O1.02 VLT is a registered Danfoss trademark
5
Technical
Data
Technical Data
Topology
Ring system - one dual
twisted pair
Physics
RS-485
Protocol
InterBus, total frame
message transfer
Method
Master/Slave
Transmission
Asynchronous, full duplex
Trans. Rate
500 Kbits/sec.
Error Check
CRC-16
Hamming distance
4
Number of I/O
Max. 4096 bits
No. of Nodes
Max. 256
Scan Speed
1024 I and 1024 O in less
than 4 ms
Total Distance
Max.12.8 km (Cu)
Segm. LengthMax. 400 m(~1200 ft.)
between 2 nodes
Cable
Belden #8103 or
equivalent
Cable lengths/number of nodes
The maximum length of the Cable is only
provided, if the bus cable has the following
properties :
- Impedance: 135 to 165 ohm at a measuring
frequency from 3 to 20 MHz
- Resistance:
<
110 ohm/km
- Capacity:
<
30 pF/m
- Damping:
max. 9 dB over the
whole wire length
-Cross sect. max. 0.34mm
2,
corresponding to AWG 22
-Cable type:
twisted in pairs,
3 x 2, wires
-Screening:
Copper-braided screen
or braided screen and foil screen
It is recommended to use the same cable type in
the entire network to avoid impedance
mismatch.