Parameterization and configuration
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6.3.2 Parameter access and initialization (safety-related)
Figure 13 shows the database of safety-related parameters and the access mechanism or initialization
of the parameter data.
Figure 13: Parameter access and initialization (safety-related)
The iParameters (individual safety parameters) and the F-parameters (PROFIsafe parameter set) are
set using a configuration tool and sent by the safety-related control (F Host) to the measuring system
during startup.
To ensure the secure transmission of iParameters, the F-parameter data block contains the F-
parameter F_iPar_CRC. The parameter contains the checksum value (CRC) from all iParameters of
the device-specific part of the measuring system and ensures the secure transmission of iParameters.
To further ensure the secure transmission of F-Parameters, the F-parameter data block contains the
F-parameter F_Par_CRC. The parameter contains the checksum value (CRC) from all F-Parameters
of the measuring system and ensures the secure transmission of F-Parameters.
The measuring system also generates a checksum from the iParameters transmitted by the F Host.
This checksum is compared in the measuring system with the checksum provided by the F Host. If
both F_iPar_CRC are identical, the measuring system switches to the cyclic data exchange during
startup, otherwise the measuring system will not start up.
The checksum value pre-programmed into the parameters F_iPar_CRC and F_Par_CRC applies to
the current standard setting of all parameters and can be used as such during plant configuration.
Every change under a data block requires a new calculation of the respective checksum value
F_iPar_CRC or F_Par_CRC. A change of the iParameters therefore requires a new calculation of the
checksum value for the F-parameter F_Par_CRC.
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