User Manual
Appendix A
GFK-2843A
Jan 2020
VersaSafe system
86
Then, for each safety function, check whether, in conjunction with all other components,
the calculated shutdown time is sufficient to ensure compliance with the required
shutdown time for the safety function.
The aim of the calculations is to ensure that the safety function responds within the
required time.
A-9.1
Typical response time
The typical response time of the VersaSafe system is the time that elapses from the signal
being applied at the safe input terminal to the response at the safe output terminal. This
time can usually only be achieved and measured during error-free operation of the
VersaSafe system.
The typical response time of the VersaSafe system is not relevant and not suitable for
dimensioning safety distances.
Figure 27: Typical response time and required shutdown time for the safety function
Table 35: Key for formula and Figure 26
Abbreviation Meaning
Note
t
SF
Required shutdown time
for the safety function
Determined from the application, e.g., from the
required times according to the distance of a light grid
Important
The typical response time depends on the network and standard control system used.
A-9.2
Shutdown times
The required shutdown time is determined based on your safety application.
The shutdown time guaranteed by the VersaSafe system (t
G
) for the safety function is
based on the longest processing time of the safe inputs involved in the safety function and
the shutdown time of the safe output (single-channel or two-channel) involved.
For the processing time of the safe inputs, please refer to the corresponding data sheets
for the safe input devices.
