Topology; Fig. 76 Address Selection Switch; Fig. 77 Address Selection Switch - Beckhoff BC3150 Documentation

PROFIBUS
Fig. 76: Address selection switch
Bus Coupler address
The lower switch S311 represents the tens, while the upper switch S310 represents the unit.
Fig. 77: Address selection switch
6.1.5

Topology

• A bus segment may consist of a maximum of 32 devices (including the repeaters).
• The maximum cable length of a segment depends on the data transfer rate in use and on the quality of
the bus cables being used.
• No more than 9 repeaters may be installed between two devices.
• Stubs are to be avoided, and are not permitted above 1.5 Mbaud.
• The maximum number of devices is 127
• Interrupting the supply voltages from cable ends by switching off the repeater/slave, or by pulling out
the plug, is not permitted.
86 Version: 2.1.0 BC3150