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No.EX##-OMY0004
17. Appendix A: glossary
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.
Cross circuit
A wiring fault where 2 signals are accidently swapped e.g. UT1 and UT2 are incorrectly wired to the wrong
inputs. See also definition for ‘Short circuit’
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 (see 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.
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