Lenze i950 Series, Manual

Page: 451 / 500

Response time of the safety bus
Response time when reacting to an event in the safety sensor technology (input data)
[ms]
t
1
Response time of the safety sensor technology See manufacturer information
t
2
Input delay of safe inputs
0x211A:002 0...100
Input filter 2
t
3
Processing time in the integrated safety system
Main task cycle time Technology application 1
PLC project According to the setting
Internal transmission time 40
Input data ready for transmission t
1
+ t
2
+ t
3
t
ps
PROFINET cycle time See manufacturer information
Input data ready for processing in the safety PLC t
1
+ t
2
+ t
3
+ t
ps
Tab. 5: Response time when reacting to an event in the safety sensor technology
Response time when reacting to a control word (output data) [ms]
t
4
Processing time in the safety PLC Calculate
t
ps
PROFINET cycle time See manufacturer information
t
5
Processing time in the integrated safety system
Main task cycle time Technology application 1
PLC project According to the setting
Internal transmission time 108
Safety cycle time 4
Safety function begins after t
4
+ t
ps
+ t
5
Tab. 6: Response time when reacting to a request via the safety bus
Information on how the processing time is calculated and on the safety bus transmission time
can be found in the documentation of the safety PLC you are using.
If the safety bus communication is faulty after the safety bus monitoring time
(F_WD_Time) expires, the system switches to the fail-safe state. The safety bus
communication is passivated.
Example
•
After an event on a safe input, the message is looped back to the integrated safety system
via the safety PLC.
•
The integrated safety system then triggers a safety function.
•
The maximum response time to the event is then calculated as follows:2
-
t
max
= t
1
+ t + t
3
+ max (F_WD_Time; t
ps
+ t
4
+ t
ps
+ t
5
)
-
Include the times of the safety functions into the calculation. For instance, for SS1 the
stopping time until STO is active. 0x2894:001
Safety functions
Response times
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