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102597_en_03 PHOENIX CONTACT
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Table of contents
1 Introduction ................................................................................................................................7
1.1 Target group for this application manual ................................................................ 7
1.2 Symbols used ........................................................................................................ 8
1.3 Further documentation .......................................................................................... 8
2 Safety of machines and systems ...............................................................................................9
2.1 Functional safety ................................................................................................. 10
2.2 Practical procedure in accordance with EN ISO 13849 ....................................... 10
2.2.1 Definition of the safety function ............................................................ 10
2.2.2 Determination of the required performance level (PL
r
) ......................... 11
2.2.3 Technical implementation .................................................................... 11
2.2.4 Determination of the achieved PL for each subsystem ......................... 12
2.2.5 Determination of the achieved PL for the overall safety function .......... 14
2.2.6 Verification of the achieved PL ............................................................. 14
2.2.7 Validation ............................................................................................. 14
2.3 Practical procedure in accordance with 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 (SRECS) ............. 15
2.3.4 Dividing the safety function into subsystems ........................................ 16
2.3.5 Determination of the achieved safety integrity for the entire SRECS .... 18
2.3.6 Verification of the achieved SIL ............................................................ 18
2.3.7 Validation ............................................................................................. 19
3 Safety technology basics .........................................................................................................21
3.1 Cross-circuit detection ......................................................................................... 21
3.2 Maximum cable lengths ....................................................................................... 22
3.3 Stop ..................................................................................................................... 24
3.4 Safe isolation ....................................................................................................... 26
4 Overview of safe switching devices .........................................................................................27
4.1 Conventional safety relays PSRclassic................................................................ 27
4.2 Multifunctional safety relays PSRmultifunction .................................................... 29
4.3 Modular safety relay system ................................................................................ 30