schmersal PSC1 Series Installation Manual page 6

Installation manual
7.3 Reset behaviour .................................................................................................................................. 128
7.3.1 Reset types and triggering element .................................................................................... 128
7.3.2 Reset timing ........................................................................................................................ 129
7.3.3 Reset function ..................................................................................................................... 129
7.3.3.1 Example reset function with protection against incorrect usage .................................... 131
7.4 LED indication ..................................................................................................................................... 134
7.5 Parameter configuration..................................................................................................................... 135
7.5.1 Using the Memory Card ...................................................................................................... 135
7.6 Function test ....................................................................................................................................... 136
7.7 Validation ........................................................................................................................................... 136
8 SAFETY-RELATED CHECK .............................................................................. 137
9 MAINTENANCE ................................................................................................. 138
9.1 Modification / dealing with changes to the device ............................................................................. 138
9.2 Replacement of a module ................................................................................................................... 138
9.3 Servicing interval ................................................................................................................................ 138
10 TECHNICAL DATA ......................................................................................... 139
10.1 Ambient conditions ............................................................................................................................ 139
10.2 Safety-related characteristic data ....................................................................................................... 139
11 SWITCH TYPES .............................................................................................. 140
12 NOTES FOR DESIGNING, PROGRAMMING, VALIDATING AND TESTING
SAFETY-RELATED APPLICATIONS ....................................................................... 147
12.1 Risk assessment .................................................................................................................................. 147
12.2 Technical documentation required ..................................................................................................... 149
12.3 Steps required for designing, realisation and testing .......................................................................... 150
12.3.1 Phases of the V model ....................................................................................................... 151
12.3.2 Specification of the safety requirements (breakdown) ....................................................... 152
12.3.3 Specification of the functional safety system ...................................................................... 155
12.3.3.1 Definition of the safety functions ................................................................................. 155
12.3.3.2 Performance Level required (PLr) (additional emergency stop) ................................ 155
Example - specification of the safety functions in tabular form ................................. 156
12.3.3.3
12.3.4 Software specification ......................................................................................................... 157
12.3.5 Hardware specification ....................................................................................................... 159
12.3.5.1 Selection of SRP/CS and equipment ......................................................................... 159
12.3.5.2 Examples for hardware specification .......................................................................... 160
12.3.5.3 Consideration of systematic failures ........................................................................... 161
12.3.6 Hardware and software design ........................................................................................... 162
12.3.7 Check on the hardware design ........................................................................................... 162
12.3.7.1 Iterative check on the safety level achieved ............................................................... 163
12.3.8 Verification of software (program) and parameters ............................................................ 165
12.3.8.1 FUP check .................................................................................................................. 165
12.3.8.2 Validating FUP against IL and parameters using validation report ............................ 167
12.3.9 Performance of system tests / FIT test (Fault Injection Test) ............................................. 170
13 APPENDIX ...................................................................................................... 171
13.1 Appendix A - categorisation of the switch types ................................................................................ 171
13.2 CE - declaration of conformity ............................................................................................................ 174
PSC1-C-10 Installation manual V2.7
Version: 57E
Page 6 of 174