VAA-2E2A-KE1-S/E2, VAA-2E2A-KE1P-S/E2
Appendix A
1
3
0
8
6
3
2
0
1
9
-0
4
19
Example 2:
If a dangerous failure (short circuit) of the switches cannot be excluded, these switches must
be duplicated and connected in series.
Figure 6.3
Example 3:
If a short circuit in the cabling across the switches cannot be excluded, both channels are
needed to achieve a category 3 safety function.
Figure 6.4
The following function blocks can be parameterized to achieve safety category 3 in this
application during operation of the AS-Interface safety module on a safety monitor (e.g., VAS-
1A-K12 or VAS-2A-K12):
Examples 1 and 2:
Dual-channel, independent
Channel 1
Channel 2
Module
S+1
S-1
S+2
S-2
S+1
S-1
S+2
S-2
Safety circuit
Module
separately
laid
separately
laid
