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Chapter 11. Running the I/O Driver 205
Assume that at this setting, the driver can poll 5 datablocks on the device per second. If you
configure 10 datablocks for the device, all 10 try to poll at the same time. In the first second,
the first 5 poll, leaving 6 to 10 to be marked as overrun, as shown in the following figure.
Datablocks 1 to 10
1 second
2 seconds
3 seconds
4 seconds
Sent to process hardware
Sent to process hardware
Sent to process hardware
Sent to process hardware
Discarded and
marked as overruns
Discarded and
marked as overruns
Discarded and
marked as overruns
Placed in the read queue
Placed in the read queue
Placed in the read queue
- Copyright 2
- Contents 3
- 1. First-time Users 11
- What is a Channel? 12
- What is a Device? 13
- What is a Datablock? 13
- What is a Timeout? 14
- How Do Retries Work? 15
- What is Signal Conditioning? 16
- What is an Overrun? 17
- 3. Accessing Information 21
- Using the Online Help Index 22
- “database blocks” 23
- Navigating the Online Help 26
- Using Online Help Buttons 28
- Printing from the Online Help 30
- Using the Favorites Tab 32
- 4. How Do I? 33
- Choosing Poll Rates 34
- Eliminating Excess Datablocks 34
- Chapter 4. How Do I? 25 35
- Hardware 36
- To use the Enable option 37
- To stop the I/O driver 37
- To use Simulation Mode 37
- Chapter 4. How Do I? 29 39
- Accessed 40
- Remotely 40
- Chapter 4. How Do I? 31 41
- Chapter 4. How Do I? 33 43
- Datablocks using FIX or iFIX 44
- Before the block write 45
- After the block write 45
- To restart the server 46
- 5. About the SI7 I/O Driver 47
- How the I/O Driver Works 48
- The SI7 I/O Driver Features 53
- Automation Applications 57
- Feature: Phasing Poll Rates 62
- Feature: QuickFail Logic 63
- Feature: Using Latched Data 66
- SI7Drv REGSERVICE 68
- SI7Drv REGSERVER 70
- Feature: Block Writes 71
- !Send:DataBlockName 72
- Supported Hardware 74
- Supported Interface Cards 76
- Supported Protocols 76
- Required Software 76
- Programming Software 78
- 6. Hardware Setup 79
- Chapter 6. Hardware Setup 71 81
- S7 300 CPU with a CP342-5 82
- S7 300 or 400 PLC with an 83
- (no communication module) 83
- Configuring the Hardware 84
- Programming the Hardware 85
- Chapter 6. Hardware Setup 77 87
- Chapter 6. Hardware Setup 79 89
- Chapter 6. Hardware Setup 81 91
- 7. Sample Configurations 93
- Profibus to S7 400 98
- To create the database 100
- Industrial Ethernet to S7 300 103
- Industrial Ethernet to S7 400 107
- Using the MPI Port 111
- SCADA Server 112
- S7 300 PLC 112
- MPI Port 112
- Profibus cable 112
- S7 400 PLC 113
- Using SIMATIC NET v6.0 116
- 8. Using the Power Tool 119
- From Database Manager 120
- Interface 121
- Help Topics 125
- Using Shortcut Keys 128
- The Status Bar 129
- To set the refresh rate 130
- Making Advanced Settings 132
- [3] Change the line: 137
- [4] Save the file 137
- From... To 137
- Adding and Modifying Channels 140
- Adding and Modifying Devices 140
- Retry, and Delay Time 141
- Real/Float Memory 151
- Understanding Data Types 152
- Access Time 154
- Using Phasing with Poll Rates 158
- Using I/O Driver Report Files 162
- Applications 167
- Database Block Dialog Box 170
- 170
- Three-letter 172
- Driver Acronym 172
- Device Name 172
- DEVICE_NAME:ADDRESS[:BIT] 173
- !SWITCH:DEVICE 174
- !MODE:NAME 174
- !POLL:NAME 174
- !SEND:DATABLOCK 174
- Manager 176
- NONE Signal Conditioning 177
- 12BN Signal Conditioning 178
- 12AL Signal Conditioning 179
- 15BN Signal Conditioning 181
- 15AL Signal Conditioning 182
- LIN Signal Conditioning 184
- 3BCD Signal Conditioning 186
- 4BCD Signal Conditioning 188
- 13BN Signal Conditioning 189
- 13AL Signal Conditioning 191
- 8BN Signal Conditioning 192
- 8AL Signal Conditioning 193
- S5CO Signal Conditioning 197
- Data Type 199
- Database Manager 200
- 11. Running the I/O Driver 205
- SI7 - Siemens Simatic S7 7.x 209
- Stopping the I/O Driver 211
- Viewing Statistics 212
- Viewing Device Statistics 213
- Viewing Datablock Statistics 213
- Understanding Overruns 214
- 1 second 215
- 2 seconds 215
- 3 seconds 215
- 4 seconds 215
- Understanding Data Quality 216
- 12. Checking Communication 217
- 13. Optimizing Your System 221
- See Also 223
- 14. Troubleshooting 225
- Answers to Common Questions 230
- The driver does not load 231
- To display driver statistics 233
- Power Tool 237
- I am receiving overruns 240
- My message rate is slow 240
- I have a high timeout count 244
- Using the Datascope 245
- Using the Event Viewer 246
- Error Codes 248
- Getting Technical Support 249
- Visual Basic 252
- __uuidof() 253
- 16. Glossary 255
- Numerics 257
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