Installation
16
11/06 AWB1251-1590GB
Data transfer rates –
automatic baud rate
detection
After switch on the gateway SWIRE-GW-DP automatically
detects the baud rate used in the PROFIBUS-DP network.
However, at least one slave in the network must transfer
data in order for the detection to be possible.
The following baud rates are supported:
• 9.6 … 12,000 kBit/s.
Maximum distances/bus
cable lengths
Two bus cable variants are specified in the IEC 61158. Cable
type B should no longe be used with new applications as it
is out of date. With cable type A all baud rates up to
12000 kbit/s can be used. In addition to the standard cable,
there are also cables available for underground installation,
festooned cables and trailed cables.
Table 1:
Cable parameters
The following bus segment lengths result from specified
cable parameters.
Parameters
Cable type A
Surge impedance in
O
135 … 165 at 3 … 20 MHz
Effective capacitance (pF/m)
< 30
Loop resistance (
O
/km)
< 110
Conductor diameter (mm)
> 0,64
Core cross-section (mm
2
)
> 0.34
Содержание SmartWire SWIRE-GW-DP
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