Basler-electric DECS-250N User Manual Page 219
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9440500990 Rev D 203
DECS-250N Modbus™ Communication
DECS-250N Modbus™ via Ethernet
Modbus can communicate through Ethernet if the IP address of the DECS-250N is configured as
described in the Communications chapter of this manual.
Detailed Message Query and Response for RTU Transmission Mode
A detailed description of DECS-250N supported message queries and responses is provided in the
following paragraphs.
Read Holding Registers
Query
This query message requests a register or block of registers to be read. The data block contains the
starting register address and the quantity of registers to be read. A register address of N will read holding
register N+1. If the query is a broadcast (device address = 0), no response message is returned.
Device Address
Function Code = 03 (hex)
Starting Address Hi
Starting Address Lo
No. of Registers Hi
No. of Registers Lo
CRC Hi error check
CRC Lo error check
The number of registers cannot exceed 125 without causing an error response with the exception code
for an illegal function.
Response
The response message contains the data queried. The data block contains the block length in bytes
followed by the data (one Data Hi byte and one Data Lo byte) for each requested register.
Reading an unassigned holding register returns a value of zero.
Device Address
Function Code = 03 (hex)
Byte Count
Data Hi (For each requested register, there is one Data Hi and one Data Lo.)
Data Lo
.
.
Data Hi
Data Lo
CRC Hi error check
CRC Lo error check
Return Query Data
This query contains data to be returned (looped back) in the response. The response and query
messages should be identical. If the query is a broadcast (device address = 0), no response message is
returned.
Device Address
Function Code = 08 (hex)
Subfunction Hi = 00 (hex)
Subfunction Lo = 00 (hex)
Data Hi = xx (don't care)
Data Lo = xx (don't care)
CRC Hi error check
- 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
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- Power Inputs DECS-250N 26
- Power Stage 27
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- Power Stage DECS-250N 28
- Voltage and Current Sensing 29
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- Cross-Current Compensation 30
- Bus Voltage 31
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- Synchronizer 33
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- Synchronizer DECS-250N 34
- Angle Compensation 34
- Failure of Synchronization 34
- 22 9440500990 Rev D 38
- Generator Governor Control 39
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- 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
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- Auxiliary Control DECS-250N 52
- Contact Inputs and Outputs 53
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- Protection 57
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- Protection DECS-250N 58
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- DECS-250N Protection 59
- Generator Undervoltage 59
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- Generator Overvoltage 60
- Loss of Sensing 60
- Frequency Protection 61
- Power Protection 62
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- Field Protection 64
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- Exciter Diode Monitor 66
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- Power Input Failure 68
- Sync-Check Protection 69
- Configurable Protection 70
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- Limiters DECS-250N 74
- Takeover OEL 74
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- DECS-250N Limiters 75
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- Underexcitation Limiter 77
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- Stator Current Limiter 79
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- 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
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- 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
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- Control Panel 90
- 9440500990 Rev D 75 91
- Metering Summary 91
- Status Indication 92
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- Outputs 94
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- Network Load Share 95
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- 9440500990 Rev D 83 99
- Real-Time Clock 99
- Auto Export Metering 100
- Event Recorder 101
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- Event Recorder DECS-250N 102
- Triggers 102
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- DECS-250N Event Recorder 103
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- Trending 105
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- Power System Stabilizer 107
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- 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
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- 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
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- Stability Tuning DECS-250N 124
- Mounting 125
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- Mounting DECS-250N 126
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- DECS-250N Mounting 127
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- Terminals and Connectors 131
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- 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
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- Settings Explorer 148
- Metering Explorer 148
- Settings File Management 149
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- Automatic Metering Export 151
- Firmware Updates 151
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- Updates 154
- BESTlogic™Plus 155
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- BESTlogic™Plus DECS-250N 156
- BESTlogic™Plus Composition 156
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- 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
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- 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
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- Security 195
- Port Security 196
- Login and Access Controls 197
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- 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
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- 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
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- Testing DECS-250N 210
- CAN Parameters 211
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- CAN Communication DECS-250N 212
- 9440500990 Rev D 197 213
- DECS-250N CAN Communication 213
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- Modbus Modes of Operation 216
- 9440500990 Rev D 201 217
- Modbus on TCP/IP 217
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- 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
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- 9440500990 Rev D 217 233
- 218 9440500990 Rev D 234
- Metering 234
- 9440500990 Rev D 219 235
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- 9440500990 Rev D 221 237
- 222 9440500990 Rev D 238
- 9440500990 Rev D 223 239
- Limiters 239
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- 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
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- 9440500990 Rev D 241 257
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- 9440500990 Rev D 245 261
- PROFIBUS Parameters 262
- 9440500990 Rev D 247 263
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- 9440500990 Rev D 249 265
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- 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
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- 9440500990 Rev D 345 361
- 9440500990 Rev D 347 363
- Revision History 365
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