A
A-28
User manual IC220SDL953 - September 2011
GFK-2731
A 11 Time response in the VersaSafe system
In the planning phase of the machine/system and the VersaSafe system, specify the
required shutdown time for each safety function. This is ascertained on the basis of the
safety evaluation of the machine/system, taking into consideration the safety distances and
the approach speed. Observe the applicable standards and regulations.
In the planning phase of the planned VersaSafe system, also calculate the shutdown time
for the outputs.
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 11.1
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 through 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 A-7
Typical response time and required shutdown time for the safety function
t
SF
Typical response time of the
VersaSafe system
79690010
Table A-21
Key for formula and Figure A-8
Abbrevia-
tion
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
The typical response time depends on the network and standard controller used.