Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 26)

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Installation
MN05013001E 22
Transfer rates – automatic
baud rate detection The EZ204-DP module automatically detects the baud rate
used in the communication network after it is switched on.
However, this requires that at least one station sends valid
telegrams in the network.
The EZ204-DP module detects the transfer rate automatically.
The following transfer rates are supported:
• 9.6 Kbit/s to 12000 Kbit/s
Maximum distances/bus
cable lengths Two types of bus cable are specified in IEC 61158. Cable type
B should no longer be used with new applications because it
is obsolete. Cable type A allows all transfer rates up to
12000 Kbit/s to be used. Cables for burial in the ground,
festoon suspension and drum cables are also available.
The cable parameters are as follows:
The cable parameters specified allow the following bus
segment lengths.
Parameters Cable type A
Surge impedance in Ω 135 ... 165 at 3 ... 20 MHz
Effective capacitance (pF/m) < 30
Loop resistance (Ω/km) < 110
Core diameter (mm) > 0.64
Core cross-section (mm 2 ) > 0.34