Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics
5
Table of contents
1
Introduction ..................................................................................................................................................... 7
1.1
Target group for this application manual ................................................................................................ 7
2
Safety of machines and systems ..................................................................................................................... 9
2.1
Functional safety ................................................................................................................................... 10
2.2
Practical procedure according to EN ISO 13849 ................................................................................... 10
2.2.1
Definition of the safety function ................................................................................................... 10
2.2.2
Determination of the required performance level (PLr) .............................................................. 11
2.2.3
Technical implementation ............................................................................................................. 11
2.2.4 Dividing the safety function into subsystems ................................................................................ 12
2.2.5
Determination of the achieved PL for each subsystem ................................................................. 12
2.2.6
Determination of the achieved PL for the overall safety function ................................................ 14
2.2.7
Verification of the achieved PL ...................................................................................................... 14
2.2.8
Validation ...................................................................................................................................... 14
2.3
Practical procedure according to EN ISO 62061 ................................................................................... 15
2.3.1
Specification of requirements for the safety-related control function (SRCF) ............................... 15
2.3.2
Determination of the required safety integrity level (SIL) ............................................................ 15
2.3.3
Drafting the safety-related electrical control system ................................................................... 15
(SRECS) .......................................................................................................................................................... 15
2.3.4
Determination of the achieved safety integrity for the entire SRECS ........................................... 16
2.3.5 Verification of the achieved SIL ...................................................................................................... 16
2.3.6
Validation ...................................................................................................................................... 17
3
Safety technology basics ............................................................................................................................... 18
3.1
Cross-circuit detection .......................................................................................................................... 18
3.2
Maximum cable lengths ........................................................................................................................ 19
3.3
Stop ....................................................................................................................................................... 20
4
Application examples for YRB-4EML-31S safety relay .................................................................................. 22
4.1
Emergency stop ..................................................................................................................................... 22
4.1.1
YRB-4EML-31S up to PL c/SIL 1 ...................................................................................................... 23
4.1.2
YRB-4EML-31S up to PL d/SIL 2 ..................................................................................................... 25
4.2
Light curtain (ESPE) ................................................................................................................................ 27
