Siemens SIPART PS2 6DR50xx Instrucciones de operaciones Pagina 102
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- MARCADORES
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Functional safety
8.1 General safety notes
SIPART PS2 with and without HART communications
102 Operating Instructions, 09/2007, A5E00074631-07
Functioning of the system as shown in the example
The transmitter generates a process-specific analog signal. The downstream control system
monitors this signal to ensure that it does not fall below or exceed a set limit value. In case of
a fault, the control system generates a failure signal of < 3.6 mA or > 22 mA for the
connected positioner, which switches the associated valve to the specified safety position.
8.1.2 Safety Integrity Level (SIL)
The international standard IEC 61508 defines four discrete Safety Integrity Levels (SIL) from
SIL 1 to SIL 4. Each level corresponds to the probability range for the failure of a safety
function.
Description
The following table shows the dependency of the SIL on the "average probability of
dangerous failures of a safety function of the entire safety-instrumented system" (PFD
AVG
)
The table deals with "Low demand mode", i.e. the safety function is required a maximum of
once per year on average.
Table 8-1 Safety Integrity Level
SIL Interval
4 10
-5
≤ PFD
AVG
< 10
-4
3 10
-4
≤ PFD
AVG
< 10
-3
2 10
-3
≤ PFD
AVG
< 10
-2
1 10
-2
≤ PFD
AVG
< 10
-1
The "average probability of dangerous failures of the entire safety-instrumented system"
(PFD
AVG
) is normally split between the three sub-systems in the following figure.
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Figure 8-2 Example of PFD distribution
- sipart 1
- Electropneumatic positioners 3
- SIPART PS2 with and without 3
- HART communications 3
- Table of contents 5
- Table of contents 7
- Introduction 11
- 1.3 Further information 12
- General safety notes 13
- 2.4 Measures 14
- 2.5 Qualified Personnel 15
- 2.6 SIL applications 15
- 3.2 Structure 18
- Description 19
- 3.2 Structure 19
- Functional principle 21
- 3.4 Device components 23
- 3.4.2 Motherboard 24
- 3.4.4 Pneumatic connections 25
- Structure 26
- 3.4 Device components 27
- 3.4.5 Purge air switching 28
- 3.4.6 Restrictors 28
- 3.5 Mode of operation 29
- 3.5.2 Control algorithm 30
- 3.5 Mode of operation 31
- Function 32
- Mounting 33
- Installing the positioner 35
- Mounting 37
- 40
- 0% 20 40 60 80 100% 41
- Procedure 45
- Installing option modules 49
- Installing option modules 51
- Installing the module cover 54
- 5.2 Iy module 55
- 5.3 Alarm unit 56
- 5.4.1 SIA unit 58
- Installing the SIA unit 59
- Setting the L1 and L2 limits 60
- Device features 61
- 5.6 EMC filter module 63
- 5.7 Accessories 65
- Warning labels 66
- Connection 67
- 6.1 Electrical connection 68
- Two-wire mode 69
- 6.1.2.1 Basic device 70
- 6.1.2.2 Current output 71
- 6.1.2.4 SIA unit 72
- Connection 73
- 6.1 Electrical connection 73
- 6.1.3.1 Basic device 77
- Basic device 77
- 6.1.3.2 Split range 79
- 6.1.3.3 Current output 80
- 6.1.3.5 SIA unit 82
- 6.1.4.1 Basic device 85
- 6.1.4.2 Current output 87
- 6.1.4.4 SIA unit 88
- 6.2 Pneumatic connection 89
- Operating 91
- 7.1.2 Buttons 93
- 7.2 Operating modes 94
- VLPXOWDQHRXV VLPXOWDQHRXV 96
- Manual mode (MAN) 97
- Automatic (AUT) 97
- Diagnostics 97
- Operating 99
- 8.1 General safety notes 101
- Description 102
- Functional safety 103
- 8.2.2 Safety function 104
- 8.2.3 Settings 105
- Checking the safety function 106
- Repairs 106
- See also 106
- Commissioning 107
- Sequence of RUN1 109
- Commissioning 111
- IODVKHV 113
- DOWHUQDWLQJ 113
- Condition 114
- Connecting the positioner 114
- Setting the actuator 115
- Conditions 115
- Setting parameter 3 117
- Replacing the positioner 126
- Parameterizing/addressing 129
- 10.3 Overview of parameters 131
- Overview 132
- Parameterizing/addressing 133
- 10.3 Overview of parameters 134
- Overview parameter A 135
- Overview parameter b 136
- Overview parameter C 136
- Overview parameter d 136
- Overview parameter E 136
- Overview parameter F 136
- Overview parameter G 137
- Overview parameter H 137
- Overview parameter J 137
- Overview parameter L 137
- Overview parameter O 138
- Overview parameter P 138
- 1.YFCT - actuator type 138
- 8.SPRE - Split range start 142
- 9.SPRE - Split range end 142
- 10.TSUP - Setpoint ramp OPEN 143
- 12.SFCT - Setpoint function 143
- 44.AFCT - Alarm function 149
- 50.PRST - Preset 152
- PST - partial stroke test 153
- A1.STPOS - start position 154
- A2.STTOL - start tolerance 154
- A3.STEP - step height 154
- A4.STEPD - step direction 154
- A5.INTRV - test interval 155
- A7.FACT1 - factor 1 155
- A8.FACT2 - factor 2 155
- A9.FACT3 - factor 3 156
- LEAK - pneumatic leakages 158
- C2.FACT1 - factor 1 159
- C3.FACT2 - factor 2 159
- C4.FACT3 - factor 3 159
- DEBA - dead zone monitoring 161
- F1.LEVL1 - threshold 1 162
- F2.LEVL2 - threshold 2 162
- F3.LEVL3 - threshold 3 163
- G1.LEVL1 - threshold 1 164
- G2.LEVL2 - threshold 2 164
- G3.LEVL3 - threshold 3 164
- J3.LEVL2 - threshold 2 167
- J4.LEVL3 - threshold 3 167
- L2.FACT1 - factor 1 168
- L3.FACT2 - factor 2 168
- L4.FACT3 - factor 3 168
- P3.LEVL1 - threshold 1 171
- P4.LEVL2 - threshold 2 171
- P5.LEVL3 - threshold 3 171
- Messages during operation: 177
- 11.2 Diagnosis 178
- Explanation about the table 179
- Diagnostic value 53 180
- 11.2 Diagnosis 181
- 10 LEAK - leakage 182
- 11.2 Diagnosis 184
- 44 PRDN - prediction down 186
- 11.3 Online diagnostics 187
- 11.3.2 XDIAG parameter 188
- 11.3 Online diagnostics 190
- 11 Pneumatic leakage 191
- 13 Temperature undershot 192
- 14 Temperature overshot 192
- 11.4 Fault correction 193
- Service and maintenance 199
- Dismantling 200
- Installation 200
- Technical data 201
- 13.1 General technical data 202
- Technical data 203
- SIPART PS2 HART 204
- Optional modules 206
- Dimension drawings 211
- Dimension drawings 213
- 15.1 Overview 215
- Options 216
- Accessories 216
- 15.3 Optional modules 217
- 15.4 Spare parts 218
- 15.4 Spare parts 219
- Small part set 1 220
- Small part set 2 221
- 15.6 Accessories 222
- Appendix 223
- SIEMENS AG, A&D PI TQ2 225
- A.3 Test report (extract) 226
- Appendix 227
- A.3 Test report (extract) 227
- Abbreviations 229
- Glossary 231
- Glossary 233
- Zone 22 238
- Index 241
- A5E00074631 242
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