Lenze SM302 - Response times

Safety engineering
Response times
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EDS94AYAF EN 1.0
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 a safety bus is used:
– Monitoring time for cyclic services.
– Monitoring time 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. 1−13 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