Startup Of Field Devices Depending On The Configuration - Siemens Simatic CFU Commissioning Manual

Commissioning

8.2 Startup of field devices depending on the configuration

8.2 Startup of field devices depending on the configuration
You can find information on the PROFIBUS PA profiles and Selected IO in section "PA profiles
for field devices on PROFIBUS PA (Page 23)".
Field device detected at CFU PA startup
The power supply of the field devices is enabled in the default parameter assignment of the
CFU PA.
1. During the startup phase of the field device, the green LED flashes on the fieldbus
connection.
2. When the startup phase is successfully completed, the green LED is continuously lit.
Communication between the CFU PA and the field device is then possible.
Diagnostics
If the field device does not support the configured IO, a diagnostic interrupt is triggered.
To eliminate the error you must change the configuration.
Section "Diagnostics via LED displays (Page 91)" contains the following information for a
fieldbus connection:
● Information for analysis of the cause of errors
● Information on the status
Field device replacement
● During a field device replacement the Selected IO of the CFU PA overwrites the profile set
in the field device.
● If the field device does not have this profile, this is signaled by an error message.
You then have the option of changing the selected IO to a value available in the field device.
The selected IO of the CFU PA is never automatically overwritten by the PA profile active
in the field device.
Configuring an IO
The PA profiles offered by the field device are read-in again by the CFU PA only after a field
device replacement.
For connected field devices, the CFU PA automatically attempts to set the PROFIBUS PA
address on the field device.
You can find the assignment of fieldbus connections to the addresses of the PROFINET PA
field devices in section "PROFIBUS addresses of the PROFIBUS PA field devices on the CFU
PA (FBn) (Page 151)".
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Commissioning Manual, 07/2018, A5E39252870-AC
SIMATIC CFU