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V2 AC500 Hardware 1-49 System data AC500 / Issued: 05.2007
Wiring
Bus line
Type twisted wires (2 cores, shielded)
Characteristic impedance 135...165 Ω
Cable capacitance < 30 pF/m
Diameter of the cores (copper) ≥ 0.64 mm
Conductor cross section of the cores ≥ 0.34 mm²
Wire resistance per core ≤ 55 Ω/km
Loop resistance (resistance of two cores) ≤ 110 Ω/km
Cable lengths
Within one segment, the maximum possible cable length of a PROFIBUS subnet depends on the
transmission speed.
Baud rate Max. cable length
9.6 kbaud to 187.5 kbaud 1000 m
500 kbaud 400 m
1.5 Mbaud 200 m
3 Mbaud to 12 Mbaud 100 m
Table: Maximum cable length of a segment within a PROFIBUS subnet
The cable ends of the bus segments must be equipped with terminating resistors according to the
following drawing. The terminating resistors are commonly integrated into the bus connectors.
390 Ohms
220 Ohms
390 Ohms
VP (+5 V)
GND (0 V)
RxD/TxD-P
RxD/TxD-N
Data line B
Data line A
Figure: Configuration of the terminating resistors
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