Lenze E94AYAE SM301 - Manual (Page 107)

Safety engineering
Response times
1
l
107 EDS94AYAE EN 7.0
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
0 Standard device
1 Safety module
2 Safety PLC
3 Safety bus
mC Microcontroller
S
Safety sensor technology
SF Activated safety function