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5.3
PROFIBUS interface terminal assignment
PROFIBUS interface
The table below shows the terminal assignment of the PROFIBUS interface. The assignment
corresponds to the standard assignment of RS485 interface.
Table 5- 1
Note
No 24 V DC supply voltage
The PROFIBUS interface does not provide a 24 V DC power supply. I/O devices (for example,
PC adapter 6ES7972-0CB20-0XA0) are therefore not operational on the interface.
5.4
Ambient temperature
Restrictions of the maximum specified ambient temperature
The maximum permissible temperatures of the module for altitudes up to 2000 m can be
found above in the technical specifications.
When using the module at higher altitudes, the decrease in the cooling effect due to
convection as a result of the lower air pressure must be taken into account. According to
IEC 61010-2-201 CD2 2015, the temperature at altitudes > 2000 m must be reduced.
SIMATIC CM 1542-5
Operating Instructions, 01/2023, C79000-G8976-C290-07
Terminal assignment PROFIBUS interface
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5.3 PROFIBUS interface terminal assignment
Signal name
-
-
-
-
RxD/TxD-P
Data line B
RTS
Request To Send
M5V2
Data reference potential (from station)
P5V2
Supply plus (from station)
-
-
RxD/TxD-N
Data line A
-
-
Technical specifications
Designation
57
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