
Safety systems - General information
4.3 Basic terminology
3SK1 safety relays
Manual, 04/2013, A5E02526190021A/RS-AA/01
31
4.3
Basic terminology
4.3.1
Redundancy/single-channel and two-channel
Redundancy
With redundancy, more than one component is implemented for the same function, so a
faulty function of a component is performed instead by the other component(s).
A redundant configuration reduces the probability of a function failing due to a single
defective component. This requirement is essential for achieving SILCL 3 in accordance with
IEC 62061, SIL 3 in accordance with IEC 61508 and PL e (Cat. 4) in accordance with
ISO 13849-1 (also necessary for SIL 2 / PL d under certain circumstances).
The simplest form of redundancy is two-channel redundancy.
If a circuit fails, two-channel redundancy ensures that the safety function is maintained.
In a redundant system configuration, the subsystems for detecting and reacting must also be
implemented with two-channel redundancy.
Note
All SIRIUS Safety devices that comply with SILCL 3 in accordance with IEC 62061, SIL 3 in
accordance with IEC 61508 and PL e (Cat. 4) in accordance with DIN EN ISO 13849-1 are
redundantly configured with regard to the internal logic as well as with regard to the output
circuits.
4
4
6
67$57
6.
Figure 4-1
Single-channel sensor connection
Содержание SIRIUS 3SK1
Страница 2: ......
Страница 10: ...Table of contents 3SK1 safety relays 10 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 14: ...Introduction 1 6 Correction sheet 3SK1 safety relays 14 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 28: ...Product overview for 3SK1 3 5 3SK1 system 3SK1 safety relays 28 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 94: ...3SK1 devices 5 4 3SK1 input expansions 3SK1 safety relays 94 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 102: ...System configuration 6 3 System configuration rules 3SK1 safety relays 102 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 186: ...Commissioning 3SK1 safety relays 186 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 192: ...Display and diagnostics 12 4 Diagnostics 3SK1 safety relays 192 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 242: ...Technical data 13 3 Expansion modules 3SK1 safety relays 242 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 258: ...Accessories 3SK1 safety relays 258 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 260: ...Appendix A 1 Correction sheet 3SK1 safety relays 260 Manual 04 2013 A5E02526190021A RS AA 01 ...
Страница 261: ......