Siemens SIRIUS 3SK1 Technical Document

Industrial Controls
Safety engineering
SIRIUS 3SK1 Safety Relays and
3RQ1 Positively-Driven Coupling
Relays
Equipment Manual
05/2021
A5E02526190021A/RS-AE/005
Introduction 1
Safety instructions 2
Description 3
Safety systems - General
information 4
3SK1 / 3RQ1 devices 5
System con󹪝guration 6
Mounting 7
Connection 8
Con󹪝guration / operation 9
Commissioning 10
Display and diagnostics 11
Technical data 12
Dimension drawings 13
Circuit diagrams 14
Accessories 15

Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage
to property. The notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices
referring only to property damage have no safety alert symbol. These notices shown below are graded according to
the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will be
used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to property
damage.
Quali󹪝ed Personnel
The product/system described in this documentation may be operated only by personnel quali󹪝ed for the speci󹪝c
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Quali󹪝ed personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended or
approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and maintenance
are required to ensure that the products operate safely and without any problems. The permissible ambient
conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identi󹪝ed by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication may
be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software described.
Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the information in this
publication is reviewed regularly and any necessary corrections are included in subsequent editions.
Siemens AG
Smart Infrastructure
Electrical Products
Postfach 10 09 53
93009 Regensburg
GERMANY
3ZX1012-0SK11-0AC0
Ⓟ 06/2021 Subject to change
Copyright © Siemens AG 2013.
All rights reserved

Table of contents
1 Introduction ........................................................................................................................................... 9
1.1 Purpose of this manual ........................................................................................................ 9
1.2 Target group ...................................................................................................................... 10
1.3 Required basic knowledge.................................................................................................. 11
1.4 Validity range .................................................................................................................... 12
1.5 Siemens Industry Online Support ....................................................................................... 13
1.6 Siemens Industry Online Support app................................................................................. 15
1.7 DataMatrix code ................................................................................................................ 16
1.8 Con󹪝gurator for 3SK1 safety relays ..................................................................................... 17
1.9 User responsibility for system design and function.............................................................. 18
1.10 Additional documentation ................................................................................................. 19
1.11 History............................................................................................................................... 20
1.12 Support Request ................................................................................................................ 21
2 Safety instructions............................................................................................................................... 23
2.1 General safety notes .......................................................................................................... 23
2.2 Recycling and disposal ....................................................................................................... 26
2.3 Intended use...................................................................................................................... 27
2.4 Current information about operational safety ..................................................................... 28
2.5 Security information .......................................................................................................... 29
2.6 Electromagnetic compatibility (EMC) according to IEC 60947-5-1 ....................................... 30
3 Description........................................................................................................................................... 31
3.1 Use.................................................................................................................................... 31
3.2 Product overview ............................................................................................................... 32
3.3 Components and accessories ............................................................................................. 34
3.4 Functional scope of the 3SK1 basic units ........................................................................... 35
3.5 3SK1 system ...................................................................................................................... 36
3.5.1 3SK1 Standard system con󹪝guration .................................................................................. 36
3.5.2 3SK1 Advanced system con󹪝guration ................................................................................. 37
4 Safety systems - General information ................................................................................................. 41
4.1 What is safety?................................................................................................................... 41
4.2 Safety function .................................................................................................................. 42
4.3 Basic terminology .............................................................................................................. 43
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4.3.1 Redundancy/single-channel and two-channel ..................................................................... 43
4.3.2 Cross-circuit detection........................................................................................................ 44
4.3.3 Enabling circuit (safety-related output)............................................................................... 44
4.3.4 Signaling circuit ................................................................................................................. 44
4.3.5 Feedback circuit................................................................................................................. 45
4.3.6 Stop category .................................................................................................................... 45
4.3.7 Automatic start.................................................................................................................. 46
4.3.8 Manual start ...................................................................................................................... 46
4.3.9 Monitored start.................................................................................................................. 46
4.3.10 Two-hand operation/synchronism ...................................................................................... 47
4.3.11 Cascading.......................................................................................................................... 48
4.3.12 Startup testing................................................................................................................... 48
4.3.13 Connection of actuators..................................................................................................... 48
4.3.14 Series connection of sensors .............................................................................................. 51
4.3.15 Use of magnetically operated switches............................................................................... 52
5 3SK1 / 3RQ1 devices............................................................................................................................. 53
5.1 3SK1 standard ................................................................................................................... 53
5.1.1 General information........................................................................................................... 53
5.1.2 Applications....................................................................................................................... 53
5.1.3 3SK1111 Standard basic unit instantaneous (with relay outputs) ....................................... 54
5.1.3.1 General information........................................................................................................... 54
5.1.3.2 Function description .......................................................................................................... 54
5.1.3.3 Design............................................................................................................................... 55
5.1.3.4 Terminal assignment.......................................................................................................... 55
5.1.3.5 Inputs................................................................................................................................ 56
5.1.3.6 Outputs ............................................................................................................................. 57
5.1.3.7 Display of the operating state............................................................................................. 57
5.1.3.8 Function setting................................................................................................................. 57
5.1.4 3SK1112 Standard basic unit instantaneous (with semiconductor outputs)......................... 60
5.1.4.1 General information........................................................................................................... 60
5.1.4.2 Function description .......................................................................................................... 61
5.1.4.3 Design............................................................................................................................... 62
5.1.4.4 Terminal assignment.......................................................................................................... 62
5.1.4.5 Inputs................................................................................................................................ 63
5.1.4.6 Outputs ............................................................................................................................. 64
5.1.4.7 Display of the operating state............................................................................................. 64
5.1.4.8 Function setting................................................................................................................. 64
5.2 3SK1 Advanced.................................................................................................................. 67
5.2.1 General information........................................................................................................... 67
5.2.2 Applications....................................................................................................................... 67
5.2.3 General device features...................................................................................................... 67
5.2.4 Function description .......................................................................................................... 68
5.2.5 Functions........................................................................................................................... 69
5.2.6 3SK1121 Advanced basic unit instantaneous (with relay outputs)....................................... 70
5.2.6.1 Device features .................................................................................................................. 70
5.2.6.2 Function description .......................................................................................................... 70
5.2.6.3 Design............................................................................................................................... 71
5.2.6.4 Terminal assignment.......................................................................................................... 71
5.2.7 3SK1121 Advanced basic unit time-delayed (with relay outputs)......................................... 73
5.2.7.1 Device features .................................................................................................................. 73
5.2.7.2 Design............................................................................................................................... 74
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5.2.7.3 Terminal assignment.......................................................................................................... 74
5.2.8 3SK1122 Advanced basic unit instantaneous (with semiconductor outputs) ....................... 76
5.2.8.1 Device features .................................................................................................................. 76
5.2.8.2 Design............................................................................................................................... 78
5.2.8.3 Terminal assignment.......................................................................................................... 78
5.2.9 3SK1122 Advanced basic unit time-delayed (with semiconductor outputs) ......................... 80
5.2.9.1 Device features .................................................................................................................. 80
5.2.9.2 Design............................................................................................................................... 82
5.2.9.3 Terminal assignment.......................................................................................................... 82
5.2.10 3SK1120 Advanced basic unit instantaneous (with semiconductor outputs) ....................... 84
5.2.10.1 Device features .................................................................................................................. 84
5.2.10.2 Design............................................................................................................................... 86
5.2.10.3 Terminal assignment.......................................................................................................... 86
5.2.10.4 Status diagrams ................................................................................................................. 87
5.3 3SK1 output expansions .................................................................................................... 89
5.3.1 Applications....................................................................................................................... 89
5.3.2 Function description .......................................................................................................... 89
5.3.3 Display of the operating state............................................................................................. 90
5.3.4 Function setting................................................................................................................. 90
5.3.5 Output expansion 3SK1211 ............................................................................................... 90
5.3.5.1 Device features .................................................................................................................. 90
5.3.5.2 Design of 3SK1211-.B..0 .................................................................................................... 92
5.3.5.3 Design of 3SK1211-.BB40 .................................................................................................. 93
5.3.5.4 Terminal assignment.......................................................................................................... 93
5.3.6 Output expansion 3SK1213 ............................................................................................... 94
5.3.6.1 Device features .................................................................................................................. 94
5.3.6.2 Design of 3SK1213-.AB40 .................................................................................................. 95
5.3.6.3 Design of 3SK1213-.A.20 ................................................................................................... 96
5.3.6.4 Terminal assignment.......................................................................................................... 96
5.3.7 3RM1 Failsafe motor starters.............................................................................................. 97
5.4 3RQ1 output expansion ..................................................................................................... 98
5.4.1 Applications....................................................................................................................... 98
5.4.2 Function description .......................................................................................................... 99
5.4.3 Display of the operating state............................................................................................. 99
5.4.4 Device features .................................................................................................................. 99
5.4.5 3RQ11.00-.E.00, 3RQ1000-.G.00 con󹪝guration ................................................................ 101
5.4.6 3RQ1000-xHB00, 3RQ1000-xLB00 con󹪝guration .............................................................. 102
5.4.7 Terminal assignment........................................................................................................ 102
5.5 3SK1 input expansions..................................................................................................... 104
5.5.1 Input expansion 3SK1220 ................................................................................................ 104
5.5.1.1 Device features ................................................................................................................ 104
5.5.1.2 Applications..................................................................................................................... 104
5.5.1.3 Design............................................................................................................................. 105
5.5.1.4 Terminal assignment........................................................................................................ 105
5.5.1.5 Display of the operating state........................................................................................... 106
5.5.1.6 Function setting............................................................................................................... 106
5.5.2 Power supply 3SK1230 .................................................................................................... 107
5.5.2.1 Device features ................................................................................................................ 107
5.5.2.2 Applications..................................................................................................................... 108
5.5.2.3 Design............................................................................................................................. 109
5.5.2.4 Terminal assignment........................................................................................................ 109
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5.5.2.5 Display of the operating state........................................................................................... 110
6 System con󹪝guration......................................................................................................................... 111
6.1 General information......................................................................................................... 111
6.1.1 General notes on the Standard system.............................................................................. 111
6.1.2 General information on the Advanced system................................................................... 111
6.1.3 Maximum system con󹪝guration ....................................................................................... 112
6.2 3ZY12 device connector................................................................................................... 116
6.2.1 Device features ................................................................................................................ 116
6.2.2 Applications..................................................................................................................... 119
6.3 System con󹪝guration rules............................................................................................... 120
7 Mounting ........................................................................................................................................... 123
7.1 Warning notices............................................................................................................... 123
7.2 Terminal coding ............................................................................................................... 124
7.3 Mounting the devices on a level surface ........................................................................... 125
7.4 Disassembling devices from a level surface....................................................................... 127
7.5 Mounting 22.5 mm/17.5 mm devices on a standard mounting rail ................................... 129
7.6 Mounting the 90 mm devices on a standard mounting rail ............................................... 130
7.7 Removing devices from a standard mounting rail.............................................................. 131
7.8 Mounting 22.5 mm/17.5 mm devices with device connectors on a standard mounting rail ... 132
7.9 Removing 22.5 mm/17.5 mm devices with device connectors from a standard mounting
rail................................................................................................................................... 135
7.10 Mounting 90 mm devices with device connectors on a standard mounting rail ................. 138
7.11 Removing 90 mm devices with device connectors from a standard mounting rail.............. 141
7.12 Mounting 22.5 mm/17.5 mm devices with device connectors on the wall......................... 144
7.13 Removing 22.5 mm/17.5 mm devices with device connectors from the wall ..................... 147
7.14 Mounting 90 mm devices with device connectors on the wall........................................... 149
7.15 Removing 90 mm devices with device connectors from wall ............................................. 152
7.16 Mounting the sealable cover ............................................................................................ 154
8 Connection......................................................................................................................................... 155
8.1 Warning notices............................................................................................................... 155
8.2 22.5 mm/17.5 mm devices............................................................................................... 156
8.2.1 Terminal assignment........................................................................................................ 156
8.2.2 Connection data for 3SK1 terminals ................................................................................. 157
8.2.3 Connection data for 3RQ1 terminals................................................................................. 158
8.2.4 Connecting the screw-type terminals ............................................................................... 158
8.2.5 Disconnecting the screw-type terminals ........................................................................... 159
8.2.6 Wiring rules for spring-loaded terminal (push-in system) .................................................. 160
8.2.7 Connection data for 3SK1 spring-loaded terminal (push-in system)................................... 160
8.2.8 Connection data for 3RQ1 spring-loaded terminal (push-in system) .................................. 161
8.2.9 Connecting spring-loaded (push-in) terminals .................................................................. 161
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8.2.10 Disconnect the spring-loaded (push-in) terminal............................................................... 162
8.2.11 Attaching the terminals.................................................................................................... 163
8.2.12 Disconnecting.................................................................................................................. 164
8.3 Devices 90 mm ................................................................................................................ 167
8.3.1 Opening the terminal cover.............................................................................................. 167
8.3.2 Connection data for terminals .......................................................................................... 168
8.3.3 Connecting terminals....................................................................................................... 168
8.3.4 Mounting terminals ......................................................................................................... 170
8.3.5 Disconnecting.................................................................................................................. 171
8.4 Device replacement ......................................................................................................... 173
9Con󹪝guration / operation .................................................................................................................. 175
9.1 Procedure for con󹪝guration.............................................................................................. 175
9.2 Explanation of the device's functions................................................................................ 176
9.3 Modes ............................................................................................................................. 179
9.4 Response times................................................................................................................ 180
10 Commissioning ................................................................................................................................. 183
11 Display and diagnostics ..................................................................................................................... 185
11.1 LED display ...................................................................................................................... 185
11.2 Power-up ......................................................................................................................... 187
11.3 Error statuses................................................................................................................... 188
11.4 Diagnostics...................................................................................................................... 189
12 Technical data.................................................................................................................................... 191
12.1 Technical data in Siemens Industry Online Support........................................................... 191
12.2 Electrical endurance......................................................................................................... 192
12.3 Overview tables .............................................................................................................. 194
13 Dimension drawings.......................................................................................................................... 195
13.1 CAx data.......................................................................................................................... 195
14 Circuit diagrams................................................................................................................................. 197
14.1 CAx data.......................................................................................................................... 197
14.2 Internal circuit diagrams................................................................................................... 198
14.2.1 Internal circuit diagrams for 3SK1 Standard basic units ..................................................... 198
14.2.2 Internal circuit diagrams for 3SK1 Advanced basic units.................................................... 200
14.2.3 Internal circuit diagrams for expansion units..................................................................... 202
14.3 Typical circuits ................................................................................................................. 211
14.4 Typical circuits of 3SK1 safety relays with 3RM1 Failsafe motor starters ............................. 222
14.4.1 3SK1 safety relay with 3RM1 Failsafe motor starter via device connector........................... 222
14.4.2 3SK1 safety relay wired with 3RM1 Failsafe motor starter.................................................. 224
14.5 Additional applications..................................................................................................... 226
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15 Accessories ........................................................................................................................................ 227
Index .................................................................................................................................................. 229
Table of contents
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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Introduction 1
1.1 Purpose of this manual
This manual contains a detailed description of SIRIUS 3SK1 safety relays and components that
can be used with them as well as of 3RQ1 coupling relays.
This manual provides you with the information you require to con󹪝gure, install, connect and
diagnose 3SK1 safety relays. A few application examples provide you with a clear and practice-
oriented introduction.
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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1.2 Target group
The manual is intended for everyone involved in the following tasks:
• Planning and con󹪝guring systems
• Installation
• Commissioning
• Service and maintenance
Introduction
1.2 Target group
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1.3 Required basic knowledge
A general knowledge of the following areas is needed in order to understand this manual:
• Low-voltage switchgear
• Digital circuit logic
• Automation systems
• Safety systems
Introduction
1.3 Required basic knowledge
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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1.4 Validity range
The manual is valid for SIRIUS 3SK1 safety relays and 3RQ1 positively-driven coupling relays. It
describes the components that are valid at the time of publication.
SIEMENS reserves the right of including a Product Information for each new component, and for
each component of a later version.
Introduction
1.4 Validity range
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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1.5 Siemens Industry Online Support
Information and service
At Siemens Industry Online Support you can obtain up-to-date information from our global
support database:
• Product support
• Application examples
• Forum
• mySupport
Link: Siemens Industry Online Support
Product support
You can 󹪝nd information and comprehensive know-how covering all aspects of your product
here:
•FAQs
Answers to frequently asked questions
•Manuals/operating instructions
Read online or download, available as PDF or individually con󹪝gurable.
•Certi󹪝cates
Clearly sorted according to approving authority, type and country.
•Characteristics
For support in planning and con󹪝guring your system.
•Product announcements
The latest information and news concerning our products.
•Downloads
Here you will 󹪝nd updates, service packs, HSPs and much more for your product.
•Application examples
Function blocks, background and system descriptions, performance statements,
demonstration systems, and application examples, clearly explained and represented.
•Technical data
Technical product data for support in planning and implementing your project
Link: Product support
mySupport
The following functions are available in your personal work area "mySupport":
•Support Request
Search for request number, product or subject
•My 󹪝lters
With 󹪝lters, you limit the content of the online support to di󹪜erent focal points.
Introduction
1.5 Siemens Industry Online Support
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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•My favorites
With favorites you bookmark articles and products that you need frequently.
•My noti󹪝cations
Your personal mailbox for exchanging information and managing your contacts. You can
compile your own individual newsletter in the "Noti󹪝cations" section.
•My products
With product lists you can virtually map your control cabinet, your system or your entire
automation project.
•My documentation
Con󹪝gure your individual documentation from di󹪜erent manuals.
•CAx data
Easy access to CAx data, e.g. 3D models, 2D dimension drawings, EPLAN macros, device
circuit diagrams
•My IBase registrations
Register your Siemens products, systems and software.
Introduction
1.5 Siemens Industry Online Support
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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1.6 Siemens Industry Online Support app
Siemens Industry Online Support app
The Siemens Industry Online Support app provides you access to all the device-speci󹪝c
information available on the Siemens Industry Online Support portal for a particular article
number, such as operating instructions, manuals, data sheets, FAQs etc.
The Siemens Industry Online Support app is available for Android and iOS:
Android iOS
Introduction
1.6 Siemens Industry Online Support app
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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1.7 DataMatrix code
A DataMatrix code is lasered onto the lower terminal cover of all 3SK1-series safety relays.
DataMatrix codes are standardized in ISO/IEC 16022. The DataMatrix codes on Siemens devices
use ECC200 coding for powerful error correction.
The following device information is encoded in the DataMatrix codes as a bit stream:
• Article number (MLFB)
• Serial number
• MAC address, if applicable
This information is stored in the following format in the DataMatrix code:
1P Article number + S serial number
(+ 23S MAC address)
Data identi󹪝er Net content Separator
Note
The information content is displayed without spaces.
This machine-readable information simpli󹪝es and accelerates handling of the respective devices.
As well as fast access to the serial numbers of the respective devices for unique identi󹪝cation, the
DataMatrix codes simplify communication with Siemens Technical Support.
Introduction
1.7 DataMatrix code
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1.8 Con󹪝gurator for 3SK1 safety relays
Con󹪝gurator
Various con󹪝gurators are available on the Internet to assist you with con󹪝guration.
The con󹪝gurator for safety relays with accessories is an easy-to-use selection and engineering
tool. You can select the individual components and plan your system in accordance with your
speci󹪝c requirements. You can save your selection, export it as a text 󹪝le or you can order it
directly.
The con󹪝gurator automatically compiles a document list of the information available in Service
& Support for every component. You can use it as the basis for putting together your system
documentation.
Link:
Configurator (https://mall.industry.siemens.com/mall/en/de/Catalog/Products/10027588?
tree=CatalogTree&activetab=configurator)
Introduction
1.8 Con󹪝gurator for 3SK1 safety relays
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1.9 User responsibility for system design and function
The products described here were developed to perform safety-related functions as part of an
overall installation or machine.
A complete, safety-related system is generally equipped with sensors, evaluation units, and
signaling units, and uses reliable shutdown concepts.
It is the responsibility of the manufacturer of a system or machine to ensure that the product
functions properly.
Siemens AG, its regional o󹪟ces, and associated companies (hereinafter referred to as "Siemens")
cannot guarantee all the properties of an entire plant, system or machine that has not been
designed by Siemens.
Nor can Siemens assume liability for recommendations that appear or are implied in the
following description. No new guarantee, warranty, or liability claims beyond the scope of the
Siemens general terms of supply are to be derived or inferred from the following description.
Introduction
1.9 User responsibility for system design and function
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1.10 Additional documentation
List of references
You will 󹪝nd further manuals in the table that may be of interest for your project planning. They
are available to download from the Internet free of charge. You can create your own individual
system documentation in the Siemens Industry Online Support under "mySupport".
Title of the manual Document number
SIRIUS 3RK3 Modular Safety System 3ZX1012-0RK31-1AB1
SIRIUS 3SK2 Safety Relays 3ZX1012-0SK21-1AB1
SIRIUS 3RM1 motor starters 3ZX1012-0RM10-2AB1
SIRIUS Safety Integrated 3ZX1012-0SK11-1AB1
Interesting links
• Manuals in Siemens Industry Online Support
• FAQs about safety engineering
• Safety Evaluation Tool
• Systematic industrial safety engineering: Safety Integrated
• The EMC Directive 2014/30/EU in Practice
• Industrial Control Panels and Electronic Equipment of Industrial Machinery for North America
• Control Panels compliant with IEC Standards and European Directives
Introduction
1.10 Additional documentation
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
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1.11 History
Product version New features
02/2013 Initial release
02/2014 Integration of 3RM1 Failsafe motor starters
09/2015 Revision of the manual
04/2021 Revision of the manual and incorporation of the 3RQ1 coupling relay
Introduction
1.11 History
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