Safety engineering
Safety functions
Safe PROFIsafe connection
1
1.3
1.3.5
1.3-13
EDS94AYAD EN 2.2
In thePROFIsafe dataone bit eachis used tocontrol a certainsafety function.
The structure of the PROFIsafe data is described in the PROFIsafe profile. The
length of the PROFIsafe data (PROFIsafe message) in slot 1 permanently
amounts to 8 bytes in the SM300. They are composed according to the
following structure:
Offset Bit
Byte 7 6 5 4 3 2 1 0
0
PROFIsafe process data
(safe user data)
1
2
3
4 Control byte or status byte
5 Consecutive number
6
CRC2
(Signature consists of PROFIsafe process data and PROFIsafe parameters)
7
Tab. 1.3-7 Structure of the PROFIsafe data
The meaning of the PROFIsafe process data is separately described for
PROFIsafe output data and PROFIsafe input data. All described bits are
evaluated.
Unassignedbits arereserved for futurefunctions andmarked with”-”. These
bits must transmitted with ”0”.
The PROFIsafe output data is transmitted from the control to the safety
module.
Offset Bit
Byte 7 6 5 4 3 2 1 0
0-- - - - - SS1 STO
1 - - - - - - - -
2 - - - - - - PS_AIE -
3 - - - - - - - -
Tab. 1.3-8 Structure of the PROFIsafe output data
Details of the PROFIsafe output data
Name Value Description
STO
0
The STO function is activated.
1 The function is deactivated.
SS1
0 The SS1 function is activated. The complete function sequence cannot be
deactivated.
1 The function is deactivated.
PS_AIE
0 Idle state
0 1 Activation of fault acknowledgement
The bit must be set for at least one PROFIsafe cycle.
- 0 Reserved for future extensions
Tab. 1.3-9 Detailed specification of the PROFIsafe output data
PROFIsafe data
PROFIsafe output data
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