TESTO 6681 Profibus Instruction Manual page 43

testo 6681 Profibus
- 1.3 Commissioning 43
Number of subscribers
Master
A maximum of 32 subscribers may be attached per segment (2).
If more than 32 subscribers are to be integrated into the Profibus or the
network dimensions are to be expanded, so-called repeaters (3) are to be
installed which connect the individual bus segments with one another.
However, a maximum of 9 repeaters (3) should be inserted in the
transmission path between the Profibus master and the bus subscriber.
In total, a maximum of 126 subscribers (including repeaters) can be
connected to the bus. The repeaters do not require their own bus address,
but are included in the number of bus subscribers.
Note the bus terminating resistors (1) (see Section Terminating resistor,
chapter 1.3.4.2, page 45)