Siemens SIRIUS 3SK1, Manual

Page: 5 / 262

3SK1 safety relays
Manual, 04/2013, A5E02526190021A/RS-AA/01
5
Table of contents
1
Introduction.............................................................................................................................................. 11
1.1
User responsibility for system design and function......................................................................11
1.2 Required basic knowledge...........................................................................................................11
1.3 Validity range ...............................................................................................................................11
1.4 Definitions ....................................................................................................................................11
1.5 DataMatrix code...........................................................................................................................12
1.6 Correction sheet...........................................................................................................................13
2 Product-specific safety information .......................................................................................................... 15
2.1
General safety notes....................................................................................................................15
2.2 Safety information for hazardous areas.......................................................................................17
2.3 Intended use ................................................................................................................................17
2.4 Current information about operational safety...............................................................................18
2.5 Declaration of conformity .............................................................................................................18
3 Product overview for 3SK1 ...................................................................................................................... 19
3.1
Overview ......................................................................................................................................19
3.2 Overview of components and accessory parts............................................................................22
3.3 Functional scope of the 3SK1 basic units....................................................................................23
3.4 Introduction ..................................................................................................................................24
3.5 3SK1 system................................................................................................................................25
3.5.1 Standard.......................................................................................................................................25
3.5.1.1 Typical system configuration........................................................................................................25
3.5.2 Advanced .....................................................................................................................................26
3.5.2.1 Typical system configuration........................................................................................................26
4 Safety systems - General information...................................................................................................... 29
4.1
What is safety?.............................................................................................................................29
4.2 Safety function .............................................................................................................................29
4.3 Basic terminology.........................................................................................................................31
4.3.1 Redundancy/single-channel and two-channel.............................................................................31
4.3.2 Cross-circuit detection .................................................................................................................32
4.3.3 Enabling circuit.............................................................................................................................32
4.3.4 Signaling circuit............................................................................................................................33
4.3.5 Feedback circuit...........................................................................................................................33
4.3.6 Stop categories ............................................................................................................................33
4.3.7 Automatic start .............................................................................................................................34
4.3.8 Manual start .................................................................................................................................34