Festo 1971599, Manual

Page: 45 / 150

1. System overview CPX-FVDA-P2
1-15
Festo P.BE-CPX-FVDA-P2-EN en 1209NH English
1.2 PROFIsafe
The data exchange between the output module and the
safety controller is made via the PROFIsafe safety-oriented
bus profile from PROFIBUS or PROFINET.
1.2.1 Safety profile PROFIsafe
The PROFIsafe telegrams are embedded in standard
telegrams and guided over the so-called black channel from
the safety SSPS to the output module. The black channel
stretches from the fieldbus connection of the safety controller
through the CPX bus node to the output module
CPX-FVDA-P2 (
Fig. 1/3). There, the PROFIsafe telegrams
are processed by the output module.
In addition to the process data, safety information is transmit-
ted in the PROFIsafe telegram. Therefore, the output module
CPX-FVDA-P2 occupies 6 bytes each in the process image of
the CPX terminal (
Fig. 1/4; 3, 4 , 5 ).
1
2
3 4 5
2 1 3
1
Standard telegram with embedded
PROFIsafe data
2
Embedded PROFIsafe telegram
3
2 bytes for F user data of the module
4
1 byte status or control byte
5
3 bytes CRC signature (CRC2)
Fig. 1/4: Telegram structure of the output module CPX-FVDA-P2