4.6 CFU PA: Voltage relationships (galvanic isolation)
The CFU PA has galvanic isolation between the fieldbus and all other circuit components of the
CFU PA.
4.7 CFU PA: Functions of the fieldbus connections (FB)
FIELDBUS
The CFU PA compiles the protocols between the PROFINET IO and the PROFIBUS PA.
With regard to field devices, the CFU PA operates like a BusLink (PROFINET IO to PROFIBUS
PA) with connected field distributors for PA field devices.
You connect the PA field devices to the "FIELDBUS; FB<n>" connections on the CFU PA. CFU
PA and PA field devices form a common autonomous PROFIBUS PA system.
Parameters
Information on parameter assignment of the field devices can be found in the documentation of
the field device.
Availability
● For the "FIELDBUS; FB<n>" connections, the following applies when physical faults occur
(such as wire break or short circuit):
– Faulty connections are automatically deactivated as long as the fault exists.
– The bus is automatically terminated
● Repairs and extensions at the individual "FIELDBUS; FB<n>" connections are possible
during operation.
Additional information
● Section "CFU PA: Voltage relationships (galvanic isolation) (Page 28)"
● Section "Diagnostics via LED displays (Page 107)"
● Section "CFU PA: Using service interface (Page 124)"
● You can find information on configuring and assigning parameters in section
"Commissioning (offline) (Page 83)".
4.8 System change during operation
During operation of the CFU, you can carry out the following functions:
● Adding components
● Replacing components
Operation planning
4.8 System change during operation
SIMATIC CFU
28 Commissioning Manual, 08/2019, A5E39252870-AD
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