Lenze ELCAMZIxxx4SNNPSNN (LCU122) - Manual (Page 126)

Safety engineering
Safety functions
Safe PROFIsafe connection
7

126 EDSLCMX3024-SPS EN 5.0
Response time to an event in the safety sensors (PROFIsafe input data)
Time interval (Fig.7-6)
[ms]
t
1
Response time of the sensors according to manufacturer
information
t
2
Input delay of the safe inputs
passive sensors: 4 + 15
active sensors: 0 + 15
t
3
Processing time in drive-based safety 24
PROFIsafe input data ready for transmission to ... Σ
t
Ps
PROFIsafe cycle time according to manufacturer
information
PROFIsafe input data ready for processing in the safety PLC ... Σ
Tab. 7-4 Response time to an event in the sensors
Response time to a PROFIsafe control word (PROFIsafe output data)
Time interval (Fig.7-6)
[ms]
t
4
Processing time in the safety PLC must be calculated
t
Ps
PROFIsafe cycle time according to manufacturer
information
t
5
Processing time in drive-based safety 14
Safety function starts after ... Σ
Tab. 7-5 Response time in case of PROFIsafe request
Information on how to calculate the processing time and transmission time of the
PROFIsafe can be found in the documentation of the safety PLC used.

Note!
When the PROFIsafe communication is disturbed, it is changed to the fail-safe
state after the PROFIsafe monitoring time (F_WD_Time) has elapsed.
( Tab. 7-15)
Example
ƒ
After an event has occurred at a safe input, the message is fed back to drive-based
safety via the safety PLC.
ƒ Drive-based safety activates a safety function.
ƒ Hence, the maximum response time to the event is calculated as follows:
t
max response
= t
1
+ t
2
+ t
3
+ max {t
WD
; t
PS
+ t
4
+ t
Ps
+ t
5
}