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Cycle and reaction times
5.3 Response time
CPU 31xC and CPU 31x, Technical data
5-18 Manual, Edition 08/2004, A5E00105475-05
Calculation
The (longest) response time is the sum of:
Table 5-11 Formula: Longest response time
2 x process image transfer time for the inputs
+ 2 x process image transfer time for the outputs
+ 2 x program processing time
+ 2 × operating system processing time
+ 2 x program processing time
+ 4 x PROFINET IO update time (only if PROFINET IO is used.)
+ 4 x DP cycle time on PROFIBUS DP (only if PROFIBUS DP is used.)
+ I/O delay
= Longest response time
Equivalent to the sum of 2 x the cycle time + I/O delay time + 4 x times the PROFINET IO
update time or 4 x times the DP cycle time on PROFIBUS DP.
See also
Overview (Page 5-14)
5.3.4 Reducing the response time with direct I/O access
Reducing the response time
You can reach faster response times with direct access to the I/O in your user program, e.g.
with
• L PIB or
• T PQW
you can partially avoid the response times described above.
Note
You can also achieve fast response times by using process interrupts.
See also
Shortest response time (Page 5-16)
Longest response time (Page 5-17)
- SIMATIC 1
- CPU 31xC and CPU 31x 1
- Technical data 1
- Preface 3
- Approvals 4
- CE label 4
- C tick mark 4
- Standards 4
- Documentation classification 5
- Recycling and Disposal 6
- Table of contents 10
- Table of contents 11
- Overview 13
- Selecting and configuring 13
- (1) Analog I/Os 18
- Mode selector switch 19
- Power supply connection 19
- Differences between the CPUs 19
- MAC-ADD.: 25
- X1-X2-X3 25
- X4-X5-X6 25
- Communication 29
- 3.1.2 PROFIBUS DP 30
- 3.1.3 PROFINET (PN) 31
- 3.1.4 Point to Point (PtP) 33
- 3.2 Communication services 34
- 3.2.2 PG communication 35
- 3.2.3 OP communication 35
- 3.2.5 S7 communication 36
- Properties 37
- Reduction ratio 37
- Send and receive conditions 37
- 3.2.7 Routing 38
- Communication 39
- 3.2 Communication services 39
- Number of routed connections 40
- Requirements 41
- Real installation 42
- Configuration in STEP 7 42
- 3.2.8 PtP communication 43
- 3.2.9 Data consistency 44
- Objectives in PROFINET 45
- What is PROFINET IO? 45
- Further Information 46
- 3.2.10.1 PROFINET IO System 47
- 3.2 Communication services 48
- System Description PROFINET 48
- Detailed Information 50
- Chapter Content 51
- Data exchange 53
- Disconnecting 53
- Communication interruptions 53
- 3.3 S7 connections 54
- Connection points 55
- Transition point 55
- 3.3 S7 connections 56
- 3.3 S7 connections 57
- Example of a CPU 314C-2 DP 59
- 3.4 DPV1 60
- 3.4 DPV1 62
- 4.1.1 CPU memory areas 63
- System memory 64
- Retentive data in RAM 65
- Memory concept 66
- I/O process image 67
- Memory concept 69
- Local data 70
- Properties of an MMC 71
- MMC copy protection 72
- Useful life of an MMC 72
- 4.2 Memory functions 73
- 4.2.3.2 Uploading blocks 74
- Uploading blocks 74
- 4.2 Memory functions 75
- Restart (warm start) 76
- 4.2.5 Recipes 77
- 4.2 Memory functions 78
- Processing sequence 79
- Function principle 81
- 5.2 Cycle time 84
- Cycle and reaction times 85
- 5.2 Cycle time 85
- Extending the cycle time 86
- Process image update 87
- 5.2 Cycle time 88
- 5.2.3 Different cycle times 90
- 5.2.4 Communication load 91
- Runtimes 93
- Extending the OB1 cycle time 93
- Tips and notes 95
- 5.3 Response time 96
- 5.3 Response time 97
- Calculation 100
- See also 100
- Reducing the response time 100
- Introduction 101
- Cycle time 101
- Response time 102
- 5.5 Interrupt response time 103
- Signal modules 104
- Process interrupt processing 105
- Reproducibility 105
- 5.6 Sample calculations 106
- Installation 107
- User program 107
- Calculating the cycle time 107
- Cycle and reaction times 108
- 5.6 Sample calculations 108
- Technical data of CPU 31xC 111
- 6.1 General technical data 112
- 6.2 CPU 312C 113
- 6.2 CPU 312C 114
- Technical data of CPU 31xC 115
- 6.2 CPU 312C 115
- Technological 117
- Functions 117
- Technological Functions 117
- 6.3 CPU 313C 118
- 6.3 CPU 313C 119
- 6.3 CPU 313C 120
- Reference 123
- 6.6.2 Analog I/O 144
- Measurement principle 145
- Selection in STEP 7 146
- (Software filter) 146
- 1 averaged measured value 147
- Inputs not connected 148
- Outputs not connected 148
- 6.6.3 Configuration 149
- Parameters of standard DO 151
- Parameters of standard AI 151
- Parameters of standard AO 152
- 6.6.4 Interrupts 155
- 6.6.5 Diagnostics 156
- 6.6.6 Digital inputs 156
- 6.6.7 Digital outputs 158
- 6.6.8 Analog inputs 161
- 6.6.9 Analog outputs 163
- Technical data of CPU 31x 167
- 7.1 General technical data 168
- 7.2 CPU 312 169
- 7.2 CPU 312 170
- Technical data of CPU 31x 171
- 7.2 CPU 312 171
- 7.3 CPU 314 174
- 7.3 CPU 314 175
- 7.3 CPU 314 176
- 7.4 CPU 315-2 DP 179
- 7.4 CPU 315-2 DP 180
- 7.4 CPU 315-2 DP 181
- 7.5 CPU 315-2 PN/DP 185
- 7.5 CPU 315-2 PN/DP 186
- 7.5 CPU 315-2 PN/DP 187
- 7.6 CPU 317-2 DP 192
- 7.6 CPU 317-2 DP 193
- 7.6 CPU 317-2 DP 194
- 7.7 CPU 317-2 PN/DP 199
- 7.7 CPU 317-2 PN/DP 200
- 7.7 CPU 317-2 PN/DP 201
- Appendix 207
- SFC 20 "BLKMOV" 209
- SFC 54 "RD_DPARM" 209
- New response by the CPU 210
- Appendix 211
- Replacing a CPU 31xC/31x 212
- Consistent data 213
- A.1.10 PG/OP functions 214
- CPU 317 215
- Procedure 216
- Glossary 217
- See PROFINET CBA 218
- Glossary 219
- See Communication processor 219
- Data, temporary 220
- Default Router 220
- Determinism 220
- Device Name 220
- See System diagnostics 221
- See Switch 224
- See Fast Ethernet 224
- See Slave 227
- See SIMATIC NCM PC 227
- See Organization blocks 228
- See SIMATIC PC Station 229
- See Programming device 229
- See PROFIBUS International 229
- PROFINET 231
- PROFINET ASIC 231
- PROFINET CBA 231
- PROFINET Component 231
- PROFINET Device 231
- See PROFINET Device 233
- See Ground 233
- See Master 235
- See Proxy 236
- See Timers 237
- See Interrupt, time-of-day 237
- See Operating system 238
- See STEP 7 238
- Index 242
- Index 243
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