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Appendix A: Glossary for PROFIsafe
A definition of PROFIsafe terms is also provided in the PROFIsafe profile.
CRC
Cyclic Redundancy Check
A cyclic redundancy check is used to verify the validity of the process data contained in the safety telegram,
check whether the assigned address books are correct, and verify the safety-related parameters. This
value is part of the safety telegram.
Consecutive number
Method for ensuring that the safe data is transmitted completely and in the correct order.
F-Parameter
(According to PROFIsafe system description, Version 09, November 2007)
F-Parameters contain information for adapting the PROFIsafe layer to customer specifications and for
checking the parameterization by means of a separate method (diverse). The main F-Parameters are:
F_Source/Destination_Address (F-Address for short)
The F-Source address is combined with the F-
destination address to generate a ‘Codename’ to
identify the communication relationship between two devices. The technology part of the F-Device
compares the value with the address switch locally or with an assigned F-Address in order to check the
authenticity of the connection.
F_WD_Time
Specifies the millisecond value for the watchdog timer. The timer monitors the time that elapses until
the next valid PROFIsafe message is received.
F_SIL
Indicates the SIL that the user can expect from the relevant F-Device. It is compared with the
manufacturer
’s specification that is stored locally.
F_iPar_CRC
A checksum that is calculated from all i-Parameters of the technology-specific part of the F-Device.
F_Par_CRC
A CRC signature, which is created via all F-Parameters and ensures error-free transmission of the
F-Parameters.
F-CPU
Failsafe controller, safe controller
F_Destination_Address
F-Parameter; PROFIsafe destination address; address of the safe module (refer to also
"F-Parameter"
)
F-I/O device
Failsafe I/O device, safe input and/or output modules
Modules with integrated safety functions, which are approved for safety-related operation.
2020-10-30 10:03
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