User Manual
Appendix A
GFK-2843A
Jan 2020
VersaSafe system
87
Figure 28: Overview of shutdown times when using a VersaSafe island
This results in the following formula for t
SF
t
SF
= t
S
+ t
IN
+ t
FWD_IN
+ t
OUT_LPSDO
+ t
FWD_OUT
+ t
OUT
+ t
A
+ t
STOP
Figure 29: Overview of the shutdown time when using several VersaSafe islands
For example, when two islands are linked, the resulting formula for tSF is:
t
SF
= t
S
+ t
IN
+ t
FWD_IN
+ t
OUT_LPSDO
+ t
FWD_SL
+ t
OUT_LPSDO
+ t
FWD_OUT
+ t
OUT
+ t
A
+ t
STOP
The values t
FWD_SL
+ t
OUT_LPSDO
may deviate for each island. This is why the values t
FWD_SL
+
t
OUT_LPSDO
must be added for each island.
Important
A maximum of 5 serial chains of IC220SDL963 modules may be implemented within a
safety function!
Table 36: Key for formula and Figure 26
Abbreviatio
n
Meaning
Note
A
Demand of the safety function
B
Safe state of the system
t
SF
Required shutdown time for the
safety function
Determined from the application, e.g., from
the re- quired times according to the distance
of a light grid
t
S
Response time of the sensor
Sensor data sheet
t
IN
Processing time of the input
User manual for the safe input module
t
FWD_IN
F-Watchdog time (communication) Specified by the user in VersaConf Safety for
each IC220SDL543/IC220SDL544 module
t
FWD_SL
F-Watchdog time (slave)
Specified by the user in VersaConf Safety for
each IC220SDL543/IC220SDL544 module
t
OUT_LPSDO
Shutdown time of the IC220SDL963 15 ms; see technical data "VersaSafe system"
on page 58
