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RS 485 repeater
10.2 Applications and features (6ES7972-0AA01-0XA0)
S7-400 Automation System Module Data
404 Reference Manual, Edition 09/2009, A5E00850736-06
10.2 Applications and features (6ES7972-0AA01-0XA0)
Application of the RS 485 repeater
The RS 485 repeater amplifies data signals on bus lines and couples bus segments. You
need an RS 485 repeater for the following situations:
● There are more than 32 nodes connected to the bus.
● Bus segments should be operated ungrounded on the bus.
● The maximum cable length of a segment is exceeded.
Table 10- 1 Maximum cable length of a segment
Baud rate Max. cable length of a segment (in m)
9.6 to 187.5 Kbps 1000
500 Kbps 400
1.5 Mbps 200
3 to 12 Mbps 100
Rules
The following applies if you configure the bus with RS 485 repeaters:
● No more than 9 RS 485 repeaters can be connected in series.
● The maximum cable length between two nodes with RS 485 repeater may not exceed the
values listed in the table below.
Table 10- 2 Maximum cable length between two RS 485 repeaters
Baud rate Max. cable length between 2 nodes (in m)
with the RS 485 repeater (6ES7 972-0AA01-0XA0)
9.6 to 187.5 Kbps 10000
500 Kbps 4000
1.5 Mbps 2000
3 to 12 Mbps 1000
- SIMATIC 1
- Legal information 2
- Preface 3
- Further Information 4
- Recycling and disposal 4
- Additional support 4
- Training center 4
- Technical support 5
- Table of contents 10
- Table of contents 11
- General specifications 21
- EMC directive 22
- Low voltage directive 22
- UL approval 23
- +$=/2& 24
- FM Approval 27
- Marine Approvals 27
- Pulse-shaped interference 29
- Sinusoidal interference 30
- System perturbation 31
- Additional measures 31
- Shipment of backup batteries 32
- Storing backup batteries 32
- General specifications 33
- Operating conditions 34
- Use with additional measures 34
- Reducing vibrations 34
- Climatic ambient conditions 35
- Test voltages 36
- Protection class 36
- Design of the racks 37
- 123456789101112131415161718 38
- Order number 39
- Design of the UR1 and UR2 39
- Suitable modules for UR2-H 41
- Design of the UR2-H 42
- Suitable modules for the CR2 43
- Design of the CR2 43
- Suitable modules for the CR3 45
- Design of the CR3 45
- Design of the ER1 and ER2 47
- Power supply modules 49
- Order numbers and function 51
- Redundant operation 51
- 3.3 Backup battery (option) 53
- Backup times 54
- Meaning of the LEDs 56
- Power supply modules 57
- INTF, 5 VDC, 24 VDC LEDs 60
- Overload at 24 V 62
- Overload at 5 V 62
- BAF, BATTF 62
- BAF, BATT1F, BATT2F 63
- Function 65
- Power connection 65
- '&9 81
- '$$$ 81
- '$$$ 83
- 4.1 Module overview 94
- 4.3.1 Parameters 96
- Reading diagnostic messages 99
- Overview 100
- Digital modules 102
- Introduction 103
- Enabling interrupts 103
- Diagnostic interrupt 103
- See also 104
- Hardware interrupt 104
- Hardware interrupt lost 104
- IEC 61131, type 1 and type 2 105
- EN 60947-5-2, 2-wire BEROs 105
- Features 106
- Digital modules 107
- 4.8.1 Features 110
- Parameter assignment 115
- Data register and bus control 121
- 4.10.1 Features 124
- 1FH00-0AA0) 130
- 1BH11-0AA0) 142
- 5EH10-0AB0) 146
- Changing fuses 149
- 1BL00-0AA0) 151
- 7BL00-0AB0) 155
- 1FF00-0AA0) 161
- LED control 162
- 5EH00-0AB0) 169
- (6ES7422-1HH00-0AA0) 174
- Analog modules 179
- 5.2 Module overview 180
- Analog modules 181
- 5.2 Module overview 181
- 5.2 Module overview 182
- 5.4.1 General information 184
- Measured value resolution 185
- Input ranges 186
- Two procedures 205
- 5.6.1 Introduction 208
- Operational limit 211
- Basic error limit 211
- Conversion time, channel 1 212
- Conversion time, channel 2 212
- Conversion time, channel 3 212
- Cycle time 212
- Use of smoothing 213
- Smoothing principle 213
- Example 213
- Settling time 214
- Response time 215
- Configuration in RUN (CiR) 216
- Non-isolated sensors 221
- Connecting voltage sensors 223
- Sensor supply voltage 224
- Thermocouple design 231
- Recommended compensating box 234
- Cables for analog signals 237
- 5.19.1 Features 248
- Setting the operating mode 254
- Parameters 254
- Measuring methods 255
- Unused channels 255
- Measuring ranges 256
- Default 256
- 5.20.1 Features 257
- Measuring range modules 267
- Measured value smoothing 269
- Defaults 273
- 5.21.1 Features 274
- 5.22.1 Features 284
- 5.23.1 Features 293
- Wire break monitoring 309
- 5.24.1 Features 311
- 5.25.1 Features 321
- Step response 329
- Bus control 335
- Interface modules 343
- Rules for connection 345
- Terminator 345
- Interface modules 347
- (6ES7 461-0AA01-0AA0) 348
- Setting/changing the number 349
- (6ES7461-1BA01-0AA0) 351
- (6ES7461-3AA01-0AA0) 355
- (6ES7461-4AA01-0AA0) 358
- Compatibility 360
- S5 interface IM 463-2 361
- S5 interface IM 463-2 363
- Interface selector switch 365
- Cable length selector switch 365
- Prepare the cable 366
- Plug in the cable 366
- Select the interface 366
- Select the cable length 366
- Setting the address area 369
- Specifications 375
- 8.1.1 Overview 377
- Communication services 379
- IM operating mode 380
- Mode selector 381
- Loadable firmware 381
- 8.2 Configuration 382
- 8.3.1 Connection options 383
- 8.3.2 Bus connector 383
- Connector pin assignment 384
- Required accessories 385
- Installing connectors 386
- Reusing fiber-optic cable 387
- 8.4 Specifications 389
- 8.4 Specifications 390
- 8.4 Specifications 391
- 9.1 Features 393
- Fan monitoring 394
- Example of a message concept 395
- Shield clamp 396
- (Side elevation 396
- Scale 1:1) 396
- Shielding clamps 397
- Installation 398
- Monitoring function 399
- Wiring 400
- Signaling concept 400
- Technical specifications 401
- RS 485 repeater 403
- Grounded or ungrounded 406
- Connection scheme 407
- Amplification of bus signals 408
- 10.5 Specifications 409
- 10.5 Specifications 410
- Modifiable parameters 411
- Further references 412
- Structure of data record 1 413
- This section 421
- Bytes 0 and 1 422
- Module types 422
- Accessories and spare parts 443
- Definition 447
- Electrostatic charging 448
- Ensure sufficient grounding 449
- Avoid direct contact 449
- List of abbreviations 451
- E.1 List of abbreviations 452
- List of abbreviations 453
- E.1 List of abbreviations 453
- Glossary 455
- Glossary 457
- Work memory 468
- Index 471
- SFC 55, 411 486
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