Weidmuller SAI Active Universal Pro Series, Manual

Page: 31 / 177

Connecting the SAI Distributor
Bus termination
A reference voltage of 5 V DC is made applied to
both bus terminals. This voltage is isolated from the
internal system voltage and is applied exclusively to
supply an external bus connection with power. In-
stall the terminations at the physical beginning and
end according to the PROFIBUS standard EN
50170 using the following values:
Figure 13 Bus termination wiring
Accessories
Terminating resistor connector, PROFIBUS-DP in
M12 connector:
Type: SAIEND PM M12 5P B-COD VPE: 1
Order No.: 1784770000
Setting the transmission rate
The SAI recognises and adopts the transmission
speed which is being used on the bus. Any change
to the transmission speed on the bus will also be
recognised and adopted.
SAI distributors support all conventional baud rates.
Setting the PROFIBUS address
With the PROFIBUS address, you can determine
the address your SAI distributor will be identified
with on the PROFIBUS-DP.
Two rotary switches in the address section of the
SAI are used to make appropriate address settings.
The setting is made in hexadecimal code from 00H
to 7EH which corresponds to the decimal values
from 0 to 126.
Please refer to Appendix C: Converting
from Hexadecimal to Decimal.
Set the PROFIBUS-DP address for the SAI distribu-
tor in the settings section of the distributor. Use a
flat-bladed screwdriver to adjust the rotary switch.
NOTE
It is only possible to set the bus address
in the address section of the SAI. Any
alterations made to the bus address dur-
ing operations will be recognised and
adopted following the next reset (turning
off and on the power supply).
The factory-set bus address on the SAI
is 03.
A table is available in the Appendix C:
Converting from Hexadecimal to Decimal
to aid in conversion of decimal to hexa-
decimal addresses.
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