Question: I would like to connect a passive sensor to a safe input. Which sensor or wiring errors will be detected by the safety component and which DCavg will I achieve according to DIN EN ISO 13849-1?
Answer: If a passive sensor with two equivalent contacts is supplied via the clock outputs CLA and CLB, cross circuits (A --> B), stuck-at-high (short-circuit to 24 VDC) and stuck-at-low (short-circuit to GND) will be detected.
Table E.1 according to DIN EN ISO 13849-1:2016-06 --> input unit:
Cross comparison of input signals with immediate and intermediate results in the logic (L) as well as timewise and logical program run monitoring and detection of static failures and short-circuits (with multiple inputs/outputs) --> DC 99 %
