Basler-electric DECS-250N User Manual Page 180
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164 9440500990 Rev D
Communication DECS-250N
Modbus™ Communication
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, Modbus Setup
HMI Navigation Path: Not available through HMI.
DECS-250N systems support the RS-485 mode and Modbus/TCP (Ethernet) mode at the same time.
DECS-250N Modbus communication registers are listed and defined in the Modbus Communication
chapter of this manual.
Modbus settings for RS-485 and Ethernet are illustrated in Figure 138 and consist of RS-485 Unit ID
A
,
RS-485 Response Delay
B
, and Ethernet Unit ID
C
.
Figure 138. Modbus Setup
A
RS-485 Unit ID: Adjustable from 1 to 247 in increments of 1.
B
RS-485 Response Delay: Adjustable from 10 to 10,000 ms in 10 ms increments.
C
Ethernet Unit ID: Adjustable from 1 to 247 in increments of 1.
RS-485 Port
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, RS-485 Setup
HMI Navigation Path: Settings, Communications, RS-485 Setup
An RS-485 port uses the Modbus RTU (remote terminal unit) protocol for polled communication with other
networked devices or remote annunciation and control with an IDP-800 Interactive Display Panel. RS-485
port terminals are located on the left side panel and are identified as RS-485 A, B, and C. Terminal A
serves as the send/receive A terminal, terminal B serves as the send/receive B terminal, and terminal C
serves as the signal ground terminal. Figure 139 illustrates typical RS-485 connections for multiple
DECS-250N controllers communicating over a Modbus network.
- INSTRUCTION MANUAL 1
- Preface 3
- Warning! 4
- 9440500990 Rev D iii 5
- DECS-250N Preface 5
- Contents 7
- Introduction 17
- Applications 18
- Package 18
- Storage 19
- 4 9440500990 Rev C 20
- Introduction DECS-250N 20
- Controls and Indicators 21
- Menu Navigation 22
- Adjusting Settings 23
- Display Setup 23
- 8 9440500990 Rev D 24
- Screen Scrolling 24
- Power Inputs 25
- 10 9440500990 Rev D 26
- Power Inputs DECS-250N 26
- Power Stage 27
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- Power Stage DECS-250N 28
- Voltage and Current Sensing 29
- 14 9440500990 Rev D 30
- Cross-Current Compensation 30
- Bus Voltage 31
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- Synchronizer 33
- 18 9440500990 Rev D 34
- Synchronizer DECS-250N 34
- Angle Compensation 34
- Failure of Synchronization 34
- 22 9440500990 Rev D 38
- Generator Governor Control 39
- 24 9440500990 Rev D 40
- 26 9440500990 Rev D 42
- Regulation DECS-250N 42
- Pre-Position Setpoints 43
- Transient Boost 44
- 9440500990 Rev D 29 45
- DECS-250N Regulation 45
- Reactive Droop Compensation 45
- Network Load Sharing 45
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- Line Drop Compensation 46
- Autotracking 47
- Setpoint Configure 48
- Auxiliary Control 49
- Summing Type 50
- 9440500990 Rev D 35 51
- DECS-250N Auxiliary Control 51
- 36 9440500990 Rev D 52
- Auxiliary Control DECS-250N 52
- Contact Inputs and Outputs 53
- 9440500990 Rev D 39 55
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- Protection 57
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- Protection DECS-250N 58
- 9440500990 Rev D 43 59
- DECS-250N Protection 59
- Generator Undervoltage 59
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- Generator Overvoltage 60
- Loss of Sensing 60
- Frequency Protection 61
- Power Protection 62
- 9440500990 Rev D 47 63
- Field Protection 64
- 9440500990 Rev D 49 65
- 50 9440500990 Rev D 66
- Exciter Diode Monitor 66
- 9440500990 Rev D 51 67
- 52 9440500990 Rev D 68
- Power Input Failure 68
- Sync-Check Protection 69
- Configurable Protection 70
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- 58 9440500990 Rev D 74
- Limiters DECS-250N 74
- Takeover OEL 74
- 9440500990 Rev D 59 75
- DECS-250N Limiters 75
- 60 9440500990 Rev D 76
- Underexcitation Limiter 77
- 62 9440500990 Rev D 78
- Stator Current Limiter 79
- 64 9440500990 Rev D 80
- Low-Level Limiting 80
- High-Level Limiting 80
- Initial Delay 80
- Var Limiter 81
- Limiter Scaling 81
- Underfrequency Limiter 82
- GENERATOR VOLTS 83
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- Metered Parameters 86
- 9440500990 Rev D 71 87
- DECS-250N Metering 87
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- Metering DECS-250N 88
- 9440500990 Rev D 73 89
- Synchronization 89
- Auxiliary Control Input 89
- Tracking 89
- 74 9440500990 Rev D 90
- Control Panel 90
- 9440500990 Rev D 75 91
- Metering Summary 91
- Status Indication 92
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- Outputs 94
- 9440500990 Rev D 79 95
- Network Load Share 95
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- 9440500990 Rev D 81 97
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- 9440500990 Rev D 83 99
- Real-Time Clock 99
- Auto Export Metering 100
- Event Recorder 101
- 86 9440500990 Rev D 102
- Event Recorder DECS-250N 102
- Triggers 102
- 9440500990 Rev D 87 103
- DECS-250N Event Recorder 103
- 88 9440500990 Rev D 104
- Trending 105
- 90 9440500990 Rev D 106
- Power System Stabilizer 107
- 92 9440500990 Rev D 108
- PSS Frequency Input Signal 109
- PSS Power Input Signal 110
- P0026-21 111
- 12-09-04 111
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- Output Stage 112
- Terminal Voltage Limiter 112
- 9440500990 Rev D 97 113
- 98 9440500990 Rev D 114
- 9440500990 Rev D 99 115
- 100 9440500990 Rev D 116
- Stability Tuning 117
- Caution 118
- 9440500990 Rev D 103 119
- DECS-250N Stability Tuning 119
- Auto Tuning 119
- FCR and FVR Modes 120
- 9440500990 Rev D 105 121
- FVR Mode Stability Settings 121
- Other Modes and Functions 122
- 9440500990 Rev D 107 123
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- Stability Tuning DECS-250N 124
- Mounting 125
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- Mounting DECS-250N 126
- 9440500990 Rev D 111 127
- DECS-250N Mounting 127
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- 9440500990 Rev D 113 129
- 114 9440500990 Rev D 130
- Terminals and Connectors 131
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- 9440500990 Rev D 117 133
- 118 9440500990 Rev D 134
- Terminal Types 135
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- Typical Connections 137
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- 9440500990 Rev D 123 139
- 124 9440500990 Rev D 140
- BESTCOMSPlus 141
- Software 141
- Installation 142
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- Software DECS-250N 144
- 9440500990 Rev D 129 145
- DECS-250N BESTCOMSPlus 145
- Menu Bars 146
- 9440500990 Rev D 131 147
- Settings Explorer 148
- Metering Explorer 148
- Settings File Management 149
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- Automatic Metering Export 151
- Firmware Updates 151
- 9440500990 Rev D 137 153
- Updates 154
- BESTlogic™Plus 155
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- BESTlogic™Plus DECS-250N 156
- BESTlogic™Plus Composition 156
- 9440500990 Rev D 141 157
- DECS-250N BESTlogic™Plus 157
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- 9440500990 Rev D 153 169
- Logic Schemes 170
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- 9440500990 Rev D 157 173
- Programming BESTlogic™Plus 174
- 9440500990 Rev D 159 175
- Pickup and Dropout Timers 175
- Offline Logic Simulator 176
- BESTlogic™Plus Examples 178
- Communication 179
- Modbus™ Communication 180
- 9440500990 Rev D 165 181
- DECS-250N Communication 181
- Ethernet Port 181
- CAN Communication 182
- Ethernet Communication 183
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- Communication DECS-250N 184
- 9440500990 Rev D 169 185
- PROFIBUS Communication 186
- Configuration 187
- 172 9440500990 Rev D 188
- Configuration DECS-250N 188
- Generator PT 188
- Generator CTs 188
- 9440500990 Rev D 173 189
- DECS-250N Configuration 189
- Operating Power Input 189
- Modes of Operation 189
- Startup Functions 190
- Device Information 191
- Display Units 192
- 9440500990 Rev D 177 193
- 178 9440500990 Rev D 194
- Security 195
- Port Security 196
- Login and Access Controls 197
- 182 9440500990 Rev D 198
- Security DECS-250N 198
- Login Failure 198
- Timekeeping 199
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- Timekeeping DECS-250N 200
- 9440500990 Rev D 185 201
- DECS-250N Timekeeping 201
- 186 9440500990 Rev D 202
- Testing 203
- Frequency Response 204
- 9440500990 Rev D 189 205
- DECS-250N Testing 205
- Bode Plotting 205
- Transfer Function 205
- Time Response 206
- 9440500990 Rev D 191 207
- Signal Input 207
- Test Signal Characteristics 207
- Step Response Analysis 208
- Analysis Options 209
- 194 9440500990 Rev D 210
- Testing DECS-250N 210
- CAN Parameters 211
- 196 9440500990 Rev D 212
- CAN Communication DECS-250N 212
- 9440500990 Rev D 197 213
- DECS-250N CAN Communication 213
- 198 9440500990 Rev D 214
- Modbus Modes of Operation 216
- 9440500990 Rev D 201 217
- Modbus on TCP/IP 217
- 202 9440500990 Rev D 218
- 9440500990 Rev D 203 219
- Read Holding Registers 219
- Return Query Data 219
- 204 9440500990 Rev D 220
- Listen Only Mode 220
- Preset Multiple Registers 220
- 9440500990 Rev D 205 221
- Preset Single Register 221
- Data Formats 222
- Modbus Parameters 224
- 9440500990 Rev D 209 225
- Binary Points 225
- 210 9440500990 Rev D 226
- 9440500990 Rev D 211 227
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- 9440500990 Rev D 213 229
- 214 9440500990 Rev D 230
- 9440500990 Rev D 215 231
- 216 9440500990 Rev D 232
- 9440500990 Rev D 217 233
- 218 9440500990 Rev D 234
- Metering 234
- 9440500990 Rev D 219 235
- 220 9440500990 Rev D 236
- 9440500990 Rev D 221 237
- 222 9440500990 Rev D 238
- 9440500990 Rev D 223 239
- Limiters 239
- 224 9440500990 Rev D 240
- 9440500990 Rev D 225 241
- Setpoints 241
- 226 9440500990 Rev D 242
- 9440500990 Rev D 227 243
- Global Settings 243
- 228 9440500990 Rev D 244
- Relay Settings 244
- 9440500990 Rev D 229 245
- 230 9440500990 Rev D 246
- Protection Settings 246
- 9440500990 Rev D 231 247
- 232 9440500990 Rev D 248
- Gains Settings 248
- 9440500990 Rev D 233 249
- Legacy Modbus 249
- 234 9440500990 Rev D 250
- 9440500990 Rev D 235 251
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- 240 9440500990 Rev D 256
- 9440500990 Rev D 241 257
- 242 9440500990 Rev D 258
- 244 9440500990 Rev D 260
- 9440500990 Rev D 245 261
- PROFIBUS Parameters 262
- 9440500990 Rev D 247 263
- 248 9440500990 Rev D 264
- 9440500990 Rev D 249 265
- 250 9440500990 Rev D 266
- 9440500990 Rev D 251 267
- 252 9440500990 Rev D 268
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- 9440500990 Rev D 301 317
- 302 9440500990 Rev D 318
- Maintenance 319
- Troubleshooting 320
- Support 321
- 306 9440500990 Rev D 322
- Maintenance DECS-250N 322
- Specifications 323
- Generator Current Sensing 324
- Accessory Inputs 325
- Contact Inputs 325
- Communication Ports 325
- Contact Outputs 326
- Field Power Output 327
- Regulation 327
- Parallel Compensation 328
- Field Protection Functions 329
- Startup 330
- Voltage Matching 331
- Data Logging (Oscillography) 332
- Environment 332
- Type Tests 332
- Physical 333
- Regulatory Standards 333
- 318 9440500990 Rev D 334
- Specifications DECS-250N 334
- Analog Expansion Module 335
- 322 9440500990 Rev D 338
- Connections 338
- 324 9440500990 Rev D 340
- AEM-2020 341
- 9440500990 Rev D 327 343
- Communications 344
- Functional Description 344
- 9440500990 Rev D 329 345
- RTD Inputs 345
- 330 9440500990 Rev D 346
- Thermocouple Inputs 346
- 9440500990 Rev D 331 347
- Analog Outputs 347
- 9440500990 Rev D 333 349
- Analog Input Values 349
- 334 9440500990 Rev D 350
- 336 9440500990 Rev D 352
- Contact Expansion Module 353
- 340 9440500990 Rev D 356
- 9440500990 Rev D 341 357
- 9440500990 Rev D 343 359
- 344 9440500990 Rev D 360
- 9440500990 Rev D 345 361
- 9440500990 Rev D 347 363
- Revision History 365
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