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PHOENIX CONTACT
A Appendix: PROFIsafe terms used in the user manual
Some of the terms that are used in connection with PROFIsafe in this user manual are de-
scribed below.
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 relationships are correct, and verify
the safety-related parameters. This value is part of the safety telegram.
Consecutive number
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 specific customer
specifications and for checking the parameterization by means of a separate method (di-
verse). The main F-Parameters are:
F-CPU
Failsafe controller, safe controller
F_Destination_Address
F-Parameter; PROFIsafe destination address; address of the safe device
(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.
F-Slave
Failsafe slave
F-Source_Address
F-Parameter, PROFIsafe source address; address of the safe controller
(see also "F-Parameter")
F_S/D_Address
(F-Address for
short)
A unique address for F-Devices within a PROFIsafe island. The
technology part of the F-Device compares the value with the ad-
dress 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 mes-
sage is received.
F_SIL
Indicates the SIL that the user can expect from the relevant F-De-
vice. It is compared with the manufacturer's specification that is
stored locally.
F_iPar_CRC
A checksum that is calculated from all iParameters of the technol-
ogy-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.
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