Siemens SINAMICS G120 Operations Instructions Page 137
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Configuring the fieldbus
6.2 Communication via RS485
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
135
The telegram runtime is longer than just purely adding all of the character runtimes
(=residual runtime). You must also take into consideration the character delay time between
the individual characters of the telegram.
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: : :
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&KDUDFWHUGHOD\WLPH &KDUDFWHUUXQWLPH
0D[LPXPUHPDLQLQJWHOHJUDPUXQWLPH
Residual runtime
(compressed telegram)
50% of compressed
telegram residual runtime
Figure 6-10 Telegram runtime as the sum of the residual runtime and character delay times
The total telegram runtime is always less than 150% of the pure residual runtime.
Before each request telegram, the master must maintain the start delay. The start delay
must be > 2 × character runtime.
The slave only responds after the response delay has expired.
: : :
: : :
: : :
: : :
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6WDUWGHOD\
5HVSRQVHGHOD\
5HTXHVWIURPPDVWHU 5HTXHVWIURP
WKHPDVWHU
6ODYHUHVSRQVH
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Q
Figure 6-11 Start delay and response delay
The duration of the start delay must at least be as long as the time for two characters and
depends on the baud rate.
Table 6- 28 Duration of the start delay
Baud rate in bit/s Transmission time per character (= 11 bits) Min. start delay
9600 1.146 ms > 2.291 ms
19200 0.573 ms > 1.146 ms
38400 0.286 ms > 0.573 ms
57600 0.191 ms > 0.382 ms
115200 0.059 ms > 0.117 ms
Note: The character delay time must be shorter than the start delay.
- SINAMICS 1
- A5E02299792B AB 3
- Change history 5
- Table of contents 10
- Table of contents 11
- Introduction 13
- 1.3.1 General basics 15
- 1.3.2 Parameter 15
- Introduction 17
- Binectors and connectors 18
- BICO parameters 19
- +DQGKHOG 24
- ,23 %23 24
- Description 25
- 2.3 Power Module 26
- 2.4 Reactors and filters 27
- 2.4 Reactors and filters 28
- Installing 29
- Line supply 31
- Line filter 31
- Installing 33
- Preconditions 37
- Connecting the inverter 39
- Control cabinet design 40
- Cable routing and shielding 40
- 3.4 Installing Control Unit 44
- 3.4 Installing Control Unit 46
- Motorized potentiometer 49
- Two- or three-wire control 49
- Fixed speeds 51
- Two safety functions 52
- Process industry 54
- Commissioning 59
- 4.2.1 Collecting motor data 61
- 4.4.1 Display of the BOP-2 68
- 4.4.2 Menu structure 69
- ② Basic commissioning 69
- 4.4.5 Additional settings 72
- Commissioning steps 73
- Going online 75
- ① In the next step, set the 77
- ④ Switch on the motor 78
- Go offline 79
- Recording 80
- Trigger 81
- Display options 82
- External data backup 83
- Series commissioning 83
- Automatic upload 85
- Manual upload 85
- Automatic download 86
- Manual download 86
- 5.1 Digital inputs 92
- 5.2 Fail-safe digital input 94
- 5.3 Digital outputs 95
- 5.4 Analog inputs 96
- Adapt terminal strip 97
- 5.4 Analog inputs 97
- 5.5 Analog outputs 99
- Adapt terminal strip 100
- 5.5 Analog outputs 100
- $2 101
- Configuring the fieldbus 103
- 6.1.2 Setting the address 105
- 6.1.4 Cyclic communication 107
- Select telegram 108
- Control word 1 (STW1) 109
- Status word 1 (ZSW1) 110
- Control word 3 (STW3) 111
- Status word 3 (ZSW3) 112
- Parameter channel 113
- Configuring the fieldbus 115
- Parameter index (IND) 116
- Parameter value (PWE) 116
- 6.1.5 Acyclic communication 119
- Changing parameter values 121
- Diagnostics 122
- 6.2 Communication via RS485 124
- 6.2.2 Communication via USS 125
- 6.2 Communication via RS485 126
- Description 127
- Start delay 127
- channel (IND) 129
- 6.2.2.6 USS read request 134
- 6.2.2.7 USS write job 135
- Communication settings 139
- 6.2.3.1 Setting the address 140
- 6.2.3.3 Modbus RTU telegram 141
- Function codes used 145
- Communication errors 147
- Logical error 148
- ,QWHUIDFHV 149
- Functions 150
- 7.2 Inverter control 151
- Functions 153
- 7.2 Inverter control 153
- 7.2 Inverter control 154
- &RPPDQGGDWDVHW 158
- &RPPDQGGDWDVHW 158
- Advanced settings 159
- 7.3 Command sources 160
- 7.4 Setpoint sources 161
- 7.4 Setpoint sources 162
- 7.4 Setpoint sources 163
- Procedure 164
- Setting jogging 166
- 7.5 Setpoint calculation 168
- 7.5 Setpoint calculation 169
- 7.6 Motor control 170
- 7.6.1 V/f control 171
- 7.6 Motor control 172
- 7.6 Motor control 173
- 7.6.2 Vector control 175
- 7.6.2.3 Torque control 176
- 7.7 Protection functions 177
- 7.7 Protection functions 178
- 7.7 Protection functions 179
- Method of operation of I 180
- controller 180
- 7.8 Status messages 183
- 7.9.1 Unit changeover 184
- (VWDEOLVKWKHRQOLQH 187
- FRQQHFWLRQ 187
- *RRIIOLQH 187
- GLVFRQQHFW 187
- Regenerative power 189
- ,QYHUWHU 190
- %UDNLQJUHVLVWRU 190
- %UDNLQJ 190
- 7.9.2.2 DC braking 192
- Principle of operation 192
- DC braking parameters 194
- 7.9.2.3 Compound braking 195
- 7.9.2.4 Dynamic braking 197
- DC link, max 197
- Braking resistor connection 197
- *URXQG(DUWK 200
- )O\LQJOHDGWR 200
- 3RZHU0RGXOH 200
- &RQQHFWLRQWREUDNHFRLO 200
- LQVLGHWKHPRWRU 200
- Commissioning 204
- 7.9.3.2 Automatic switch-on 208
- WRVLJQDOHYDOXDWLRQ 215
- ',[ 215
- Speed deviation monitoring 216
- Activating the free blocks 218
- Analog signal scaling 219
- Example: AND operation 221
- 7.10.2 Permitted sensors 222
- 266' 223
- 266' 223
- Discrepancy 225
- 7.10.6 Password 228
- 7.10.7.1 Commissioning tool 229
- 7.10.7.4 Setting STO 231
- 7.10.7.5 Activate settings 231
- 7.10.8.4 Documentation 236
- Machine overview 236
- Converter data 236
- Function table 237
- 7.10.8.5 Function test 238
- Data backup 240
- Countersignatures 240
- )LUPZDUH9HUVLRQ 243
- Service and maintenance 244
- Acceptance test 245
- Signal states of the LED 248
- 9.2 Alarms 250
- Extended settings for alarms 252
- 9.3 Faults 253
- Fault acknowledgement 254
- 9.3 Faults 255
- 9.3 Faults 256
- Extended settings for faults 257
- Axxxxx Alarm 258
- Fyyyyy: Fault 258
- Technical data 265
- Technical data 267
- Definitions 269
- General data, PM240 - IP20 270
- General data, PM250 - IP20 276
- General data, PM260 - IP20 279
- Appendix 281
- Appendix 283
- A.1 Application Examples 283
- A.1 Application Examples 284
- Final steps 285
- Settings in the control 292
- Index 299
- 114, 130 300
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