1
3
0
8
6
3
2
0
1
9
-0
4
20
VAA-2E2A-KE1-S/E2, VAA-2E2A-KE1P-S/E2
Appendix A
Example 3:
Dual-channel, dependent
Dual-channel, force-guided
6.4
Category 4
The occurrence of a fault and an accumulation of faults must not lead to the loss of the safety
function.
Example 1:
Connection of a dual-channel mechanical position switch.
To detect a dangerous accumulation of faults, the safety function must be tested. The test
intervals must be adapted to the application.
Figure 6.5
Danger!
The function block
"Dual-channel, independent" must
not
be used in example 3.
Safety circuit
Module
S+1
S-1
S+2
S-2
