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Active Components for RS-485 Networks
5-12
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
5.4 Ungrounded Operation of the RS-485 Repeater
Ungrounded Operation
Ungrounded operation means that chassis and PE are not connected.
The ungrounded operation of the RS-485 repeater allows you to operate
electrically isolated bus segments.
Figure 5-8 shows the change in the potentials resulting from using the RS 485
repeater.
Signals
ungrounded
Signals grounded
Figure 5-8 Ungrounded Operation of Bus Segments
- Qualified Personnel 2
- Correct Usage 2
- Trademarks 2
- Safety Guidelines 2
- Contents 10
- PROFIBUS NETWORKS 11
- 1.1.1 General Introduction 12
- SIMATIC NET 13
- AS-Interface 14
- PROFIBUS 14
- PROFIBUS-PA 14
- EN 50170 15
- Attachable Systems 15
- Transmission Media 16
- 1.2.1 Standards 17
- 1.2.2 Access Techniques 18
- 1.2.3 Transmission Techniques 19
- EIA Standard RS-485 20
- Advantages: 20
- Restrictions: 21
- Restrictions 24
- IEC 61158-2 Standard 25
- Transmission Rate 28
- LAN Cable 28
- Node Attachment 28
- 2.2.2 Topologies with OLMs 33
- Bus Topologies 34
- Star Topologies with OLMs 35
- Optical Channels 35
- Monitoring FO Links 36
- Mixed Structure 36
- Alternative Cabling Strategy 38
- Maximum Length of a Link 40
- Point-to-Point Link 40
- Point-to-Multipoint Link 41
- Bus and Star Topology 43
- SpliTConnect System 43
- 2.5 Connectivity Devices 46
- 2.5.1 DP/DP Coupler 46
- How the DP/DP Coupler Works 47
- Parameter Assignment 47
- DP/PA Bus Coupling 48
- 2.5.3 DP/PA Coupler 49
- 2.5.4 DP/PA Link 51
- How the DP/PA Link Works 52
- DP/AS-Interface Link 65 57
- Figure 2-24 DP/EIB Link 62
- Building Automation 63
- Industrial Automation 63
- How the DP/EIB Link Works 64
- Configuring 65
- Configuring Networks 67
- PROFIBUS Networks 68
- Parameters 68
- Length of the Tap Lines 70
- Transmission Rate 1.5 Mbps 70
- Node Attachments at 1.5 Mbps 70
- Value Factors 71
- RS-485 Repeater 75
- Transmission Path 78
- Transmitter 78
- Receiver 79
- Optical Power Budget 80
- Power Budget 81
- Plastic and PCF FO Cables 81
- Glass FO Cables 81
- Link Power Margin 82
- Work Sheet 82
- Calculation Examples 84
- Link at Wavelength 86
- 3.3 Transmission Delay Time 88
- Checking the Bus Parameters 92
- OLM/G11-1300 and OLM/G12-1300 96
- Calculation of the Slot Time 97
- Entering the Bus Parameters 97
- PROFIBUS Cables 100
- Overview 100
- Permitted ambient conditions 101
- 02Y(ST)CY 103
- Permitted ambient conditions 103
- 4.1.1 FC Standard Cable 105
- Properties 106
- 4.1.3 FC Food Cable 107
- 4.1.4 FC Robust Cable 108
- 4.1.5 PROFIBUS Flexible Cable 109
- 4.1.6 FC Underground Cable 111
- 4.1.7 FC Trailing Cable 112
- Segment Lengths 114
- PROFIBUS Networks SIMATIC NET 115
- 4.1.8 PROFIBUS Festoon Cable 116
- Installation Guidelines 119
- 4.2 FastConnect Bus Connector 122
- 4.2.1 The FastConnect System 122
- FastConnect Bus Connector 123
- Technical Specifications 125
- Disconnect Function 126
- Disconnecting a Station 126
- Bus Connector with PG Socket 126
- 6ES7972-0B.50-0XA0 127
- 4.3 Bus Connectors 130
- Connector 131
- Connecting Up the LAN Cable 136
- 972-0BA30-0XA0) 138
- Appearance (6GK1500-0EA02) 142
- Fitting the Bus Connector 143
- Removing the Bus Connector 144
- 4.7.1 Versions 146
- Bus Terminal RS-485 147
- Cable Termination 147
- Additional PG Interface 149
- Bus terminal 12 M 151
- Termination 152
- MADE IN GERMANY 156
- Wall Mounting 157
- 4.8 Cable Connections 161
- 4.9.1 830-1T Connecting Cable 163
- 4.9.2 830-2 Connecting Cable 165
- 5.1 RS-485 Repeater 168
- Block Diagram 171
- Terminating Resistor On/Off 172
- Segments 1 and 2 Terminated 173
- Rear view: Front view: 176
- 80 to 110 Ncm 176
- Ungrounded Operation 178
- Cable Type 179
- Connecting the Power Supply 179
- 5.6 Connecting the LAN Cable 180
- 6ES7 972-0DA00-0AA0 181
- S Rated voltage 24 V DC 182
- S Flexible cables 182
- S Solid cables 182
- Connecting the PROFIBUS Cable 183
- 6.1 FC Process Cable 186
- 6.2 SpliTConnect Tap 187
- 1) siehe Montageanleitung des 191
- FastConnect Stripping Tool 191
- 1) siehe Montageschritt 2 195
- Networks 197
- 7.1 Fiber-Optic Cables 198
- 7.2.3 PCF Fiber-Optic Cables 206
- 7.3 Glass Fiber-Optic Cables 209
- Ordering 219
- 7.3.5 Special Cables 220
- 7.4 Fiber-Optic Connectors 222
- Optical Interfaces 222
- Order Numbers 223
- Cable Lengths 224
- Fitting Connectors On-Site 227
- Preassembled Cables 227
- 8.1 Optical Bus Terminal OBT 230
- Functions 231
- Operating Instructions 231
- 8.2 Optical Link Module OLM 232
- 9.1 Infrared Link Module ILM 238
- Ordering Data: 239
- Testing PROFIBUS 241
- A.1.1 Possible Uses 242
- A.1.2 Area of Application 242
- A.1.3 Logging Functions 242
- A.1.4 Design 243
- A.1.5 Functions 244
- A.1.6 How the Unit Functions 245
- Ordering Data 246
- Attenuation 247
- Test Methods 247
- How an OTDR Functions 250
- OTDR Evaluation 251
- LAN Cables Between Buildings 255
- Introduction 256
- Further Literature 256
- Bus Cables within Buildings 256
- LAN Cables between Buildings 257
- Coarse Protection 257
- Installing LAN Cables 263
- C.2 Electrical Safety 265
- Mechanical Protection 266
- Redundant LAN Cables 267
- Install LAN cables separately 268
- Grounding 270
- Definition 270
- Cable Shields 270
- Handling the Shield 271
- C.4.4 Equipotential Bonding 272
- Voltages and Currents 275
- Fiber-Optic Cables 275
- Telecom Cables 275
- Cable Groups 275
- Conditions 276
- Clearance Table 276
- C.5.2 Cabling within Closets 278
- Underground Cabling 280
- Cabinet Lighting 281
- C.7 Installing LAN Cables 283
- Avoid Loops 285
- Installing other Cables 285
- Simplex Connectors or 289
- Stripping the Outer Jacket 296
- Removing the Buffer 298
- Fitting Simplex Connectors 299
- Assembling the Plug Adapter 300
- Cables, Tools and Accessories 301
- Crimping the BFOC Connector 310
- Copyright © Siemens AG 1999 316
- All Rights Reserved 316
- Using the Pulling Loop 318
- Marking of the 319
- Cubicles 321
- Degree of Protection 322
- E.2 SIMATIC NET Components 323
- Standards 324
- Dimension Drawings 325
- PRLFIBUSILM 335
- Infrared Link Modul (ILM) 344
- 6ZB530–3AC30–0BA1 344
- Copyright by Siemens 345
- 1 The Product 347
- 2 Symbols 348
- 3 Introduction 349
- 4 Description of the Device 350
- SIEMENS PROFIBUS ILM 351
- 5.1 Transmission Rate 352
- 5.2 Topologies 352
- 5.2.1 Point–to–Point–Link 353
- 5.3 Signal Regeneration 360
- 5.5 Constant Light Monitoring 360
- 6 Modes and Settings 363
- 12345678 366
- 7 Installation and Startup 369
- + Caution: 370
- 8 Installing the PROFIBUS ILM 372
- ) – S1 S2 380
- ) – S1 S 2 381
- 9 Displays 382
- 11 Technical Specifications 388
- 11.1 Illumination Range 391
- 12 Appendix 393
- 13 References 394
- Noise emission Noise immunity 395
- Safety Instructions 398
- Qualified personnel 398
- Certified usage 398
- 1 Introduction 401
- Optics Company 402
- 2 General Functions 403
- Version 1.0 8/00 404
- 3 Network Topologies 405
- 3.2 Star topology 408
- 3.3 Redundant optical ring 409
- 4 Setting Up 411
- NEC Class 2 24VDC, 200mA 412
- SINEC L2FO 413
- OLM/S3; OLM/S4; 413
- OLM/S3-1300; OLM/S4-1300 413
- OLM/P3; OLM/P4 413
- 4.4 Installation 416
- Locking slide 417
- Toothed washer 417
- 5.1 LED Indicators 421
- 5.2 Troubleshooting 423
- 6 Configuration 425
- 7 Technical Data 427
- 8 Appendix 429
- 8.2 Literature notes 430
- 8.3 List of abbreviations 430
- 8.4 Measuring sockets 431
- © Siemens AG 1999 433
- Subject to alteration 433
- Order No. 6ZB5530-3AD00-0BA0 433
- Printed in Germany 433
- Connections 440
- Sensitivity 440
- Power Supply 440
- Operating Mode 440
- Mechanical Design 440
- Supplied 441
- Not supplied 441
- C79000-G8976-C122-02 442
- Functional Description 443
- 3.4 Supported FO Fiber Types 444
- 3.5 Displays 444
- 3.6 Operator Controls 446
- Network Topology 447
- 4.3 Attaching RS-485 Segments 449
- Installation and Startup 451
- 5.2 Installation 453
- Connecting the Optical Cables 456
- Troubleshooting 459
- Notes on the CE Label 465
- Notes for Australia 466
- References 467
- Abbreviations 469
- General Information 473
- Further Information 477
- SIMATIC Training Center 479
- Further Support 480
- Glossary 481
- Glossary-8 488
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