Safety engineering
Response times
1
106
EDS94AYAE EN 6.0
1.8 Response times
In order to detect the response time to a safety function the entire system must be
considered. The following is relevant:
ƒ Response time of the connected sensors.
ƒ Input delay of the safety inputs.
ƒ Internal processing time.
ƒ When using PROFIsafe as safety bus:
– Monitoring time for the cyclic service in the PROFIBUS/PROFINET.
– Monitoring time of the PROFIsafe in the safety PLC.
– Processing time in the safety PLC.
ƒ Delay times due to further components.
μC
μC
S
SF
t=0
t
1
t
2
0
1
t
ps
t
4
2
3
t
3
t
5
t
i
lcu12x_352
Fig. 1−14 Response times to the request of a safety function
Standard device
Safety module
Safety PLC
Safety bus
mC Microcontroller
S Safety sensor technology
SF Activated safety function
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