Siemens SIRIUS 3SK1 Equipment Manual

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
Table of contents
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
4 Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005

Siemens SIRIUS 3SK1 Specifications

General

Brand	Siemens
Model	SIRIUS 3SK1
Category	Relays
Language	English