Safety systems - General information
4.3 Basic terminology
3SK1 safety relays
Manual, 04/2013, A5E02526190021A/RS-AA/01
41
Series connection of position switches
In general, position switches may be connected in series if measures ensure that several
protective doors are not regularly opened simultaneously (otherwise a fault cannot be
detected).
For safety level SILCL3 in accordance with IEC 62061, SIL3 in accordance with IEC 61508,
and PL e (Cat. 4) in accordance with ISO 13849-1, however, they must never be connected
in series, because every hazardous error must be detected (independently of the operating
personnel).
6.
6
6
6
6
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