BECKHOFF BC3150 - Manual (Page 93)

Safety Instructions
Fieldbus Components 91
Topology
•
A bus segment may consist of a maximum of 32 devices (including the repeaters).
•
The maximum conductor length of a segment depends on the transmission speed 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 voltage from cable ends by switching off the repeater/slave, or by pulling out the plug,
is not permitted.
Fig. 1: RS485 topology with 3 segments and 2 repeaters.