Siemens SINAMICS G150 Operating Instructions Manual page 103

Bus terminating resistor
The bus terminating resistor must be switched on or off depending on its position in the bus,
otherwise the data will not be transmitted properly.
The terminating resistors for the first and last nodes in a line must be switched on; the
resistors must be switched off at all other connectors.
The cable shield must be connected at both ends over large-surface area contacts.
Note
Connector type
Depending on the connector type, the correct assignment of the connector must be ensured
(IN/OUT) in conjunction with the terminating resistor.
Figure 4-17
PROFIBUS address switches
The PROFIBUS address is set as a hexadecimal value via two rotary coding switches.
Values between 0
coding switch (H) is used to set the hexadecimal value for 16
switch (L) is used to set the hexadecimal value for 16
Table 4- 13
Rotary coding switch-
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Position of the bus terminating resistors
(00 ) and 127
dec hex
PROFIBUS address switches
Significance
es
16 = 16
1
16 = 1
0
(7F ) can be set as the address. The upper rotary
dec hex
.
0
21
dec
15
hex
1
5
Electrical installation
4.9 Signal connections
and the lower rotary coding
1
Examples
35 126
dec
23 7E
hex
2
3 E
dec
hex
7
103