Operating instructions

5. Installation MICRO PANEL XV-102 3.5"

32 M002869-02, 07/2009

# The maximum baud rate depends on the cable length:

Tab. 15 Relationship of cable length / baud rate (for cables compliant with cable type A of the Profibus standard EN5017)

Profibus topology #

# A bus segment can connect up to 32 bus stations.

# Several bus segments can be linked via repeaters (bidirectional amplifiers). Refer to the documen-

tation of the repeater manufacturer for further information.

# Bus terminal connector

Only use bus terminal connectors that are specified for use in the Profibus network. They hold both

bus cables on a bus station and ensure a low impedance connection of the cable shield to the

shield reference potential of the bus station.

These bus terminal connectors contain the Profibus cable termination that can be switched on as

required.

# A bus segment must be provided with cable termination at both ends. The termination is passive

and is fed from the bus station. It ensures a defined idle signal on the bus when no bus station is

transmitting.

These bus terminations should be implemented externally in the connector casing according to the

Profibus standard (they can also be implemented with the bus terminating connector described

above).

Cable length Max. baud rate

1200 m ≤ 93.75 Kbit/s

1000 m 187.5 Kbit/s

400 m 500 Kbit/s

200 m 1500 Kbit/s

When preparing the cables, ensure that there is a low-resistance connection between

the cable shield and the connector casing (→ Chapter 5.3.2, "

" 23).

The maximum cable length can be increased by using repeaters. Refer to the documen-

tation of the repeater manufacturer for further information.

Fig. 14 Termination

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