Chapter 3 - Introduction
3.5. Delay by the radio link
The table shows the data exchange time of different device
types towards the PROFIBUS subscriber behind the
transmission path at a bus speed of 500kbit/s and a DP slave
with 8Byte read/write
Radio transmission
technology
Device type
Delay typical
2.4GHz Bluetooth
3706-7, 3706-4 and 3706-1
25 ms
These time delays are caused by the device internal
PROFIBUS wireless protocol handling. From experience an
increase of the PROFIBUS speed beyond 500kbit/s does
not yield to further improvements.
This chart shows the coherence of amount of data, number
of DP slaves behind the radio link and amount of receivers to
the data exchange time for model 3706-4 @ 500kbit
P2P = point-to-point connection
MP= Multipoint
