Festo CPX-F8DE-P Manual page 29

Contents and general instructions
Term/abbreviation
Process image
PROFIBUS
PROFINET IO
PROFIsafe
PROFIsafe address
PROFIsafe monitoring
time
Reentry
Reintegration
Festo P.BE-CPX-F8DE-P-E N en 1610a English
Significance
The process image is part of a controller's system memory. At the start of
the cyclical program, the signal states of the input assemblies are
transferred to the process diagram for the inputs. At the end of the cyclical
program, the process diagram for the outputs are transferred to the output
assemblies as the signal state.
Standard for field bus communication between control units (SPS/IPC) and
devices in automation technology (PROcess Field BUS)
è www.profibus.com
Field bus standard based on Industrial Ethernet for communication
between control units (SPS/IPC) and devices è www.profinet.com
Safety-based bus profile for PROFIBUS and PROFINET IO that, in
conjunction with PROFIsafe-compliant devices (F-Host und F-Device)
facilitates correct and reliable transmission of safety messages.
Serving as mechanisms for safe transmission and error detection are:
– CRC signatures (data integrity check),
– Consecutive numbering of safety-related messages,
– Address data check è PROFIsafe address
– Time monitoring.
In case of errors, the F-Device can automatically trigger predefined safety
measures. Based on the continuous numbering, receivers can tell whether
they have received the messages in the correct sequence and completely.
For this purpose, F-Host and F-Device have their own finite state machines
that are synchronised with the help of a control and status byte. Correct
synchronization is monitored by incorporation of counter values in the
calculation of the CRC signature.
For identification of the addressee of a message, each PROFIsafe-capable
device or module has a unique PROFIsafe address. The PROFIsafe address
is specified in the configuration program and set at the PROFIsafe-capable
device or module through DIL switches. Configuration errors can be
determined automatically through comparison between the set and actual
configuration.
Monitoring time for safety-related communication between F-Host and
F-Device
Changeover from substitute values to process values = depassivation
(è Passivation).
Reintegration is a standard process of PROFIsafe to depassivize a
passivized module (PROFIsafe specification).
Reintegration is the standard PROFIsafe process for the reincorporation of
passivized modules.
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