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9440500990 Rev D 199
DECS-250N Modbus™ Communication
Modbus™ Communication
Introduction
This document describes the Modbus™ communications protocol employed by DECS-250N systems and
how to exchange information with DECS-250N systems over a Modbus network. DECS-250N systems
communicate by emulating a subset of the Modicon 984 Programmable Controller.
Modbus communications use a master-slave technique in which only the master can initiate a transaction.
This transaction is called a query. When appropriate, a slave (DECS-250N) responds to the query. When
a Modbus master communicates with a slave, information is provided or requested by the master.
Information residing in the DECS-250N is grouped categorically as follows:
• General
• Binary Points
• Metering
• Limiters
• Setpoints
• Global Settings
• Relay Settings
• Protection Settings
• Gains
• Legacy Modbus
All supported data can be read as specified in the Register Table. Abbreviations are used in the Register
Table to indicate the register type. Register types are:
• Read/Write = RW
• Read Only = R
When a slave receives a query, the slave responds by either supplying the requested data to the master
or performing the requested action. A slave device never initiates communications on the Modbus and will
always generate a response to the query unless certain error conditions occur. The DECS-250N is
designed to communicate on the Modbus network only as slave devices.
Refer to the Communication chapter for Modbus communication setup and the Terminals and Connectors
chapter for wiring.
Message Structure
Device Address Field
The device address field contains the unique Modbus address of the slave being queried. The addressed
slave repeats the address in the device address field of the response message. This field is 1 byte.
Although Modbus protocol limits a device address from 1 - 247. The address is user-selectable at
installation and can be altered during real-time operation.
Function Code Field
The function code field in the query message defines the action to be taken by the addressed slave. This
field is echoed in the response message and is altered by setting the most significant bit (MSB) of the
field to 1 if the response is an error response. This field is 1 byte in length.
The DECS-250N maps all available data into the Modicon 984 holding register address space supports
the following function codes:
• Function 03 (03 hex) - read holding registers
• Function 06 (06 hex) - preset single register
• Function 08 (08 hex), subfunction 00 - diagnostics: return query data
- 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
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- Introduction DECS-250N 20
- Controls and Indicators 21
- Menu Navigation 22
- Adjusting Settings 23
- Display Setup 23
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- 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
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- Generator Governor Control 39
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- Regulation DECS-250N 42
- Pre-Position Setpoints 43
- Transient Boost 44
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- 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
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- 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
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- Synchronization 89
- Auxiliary Control Input 89
- Tracking 89
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- Control Panel 90
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- Metering Summary 91
- Status Indication 92
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- Outputs 94
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- Network Load Share 95
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- 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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- Stability Tuning 117
- Caution 118
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- DECS-250N Stability Tuning 119
- Auto Tuning 119
- FCR and FVR Modes 120
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- 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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- BESTCOMSPlus 141
- Software 141
- Installation 142
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- Software DECS-250N 144
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- 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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- 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
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- DECS-250N Communication 181
- Ethernet Port 181
- CAN Communication 182
- Ethernet Communication 183
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- Communication DECS-250N 184
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- PROFIBUS Communication 186
- Configuration 187
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- Configuration DECS-250N 188
- Generator PT 188
- Generator CTs 188
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- 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
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- DECS-250N Timekeeping 201
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- Testing 203
- Frequency Response 204
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- DECS-250N Testing 205
- Bode Plotting 205
- Transfer Function 205
- Time Response 206
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- 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
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- 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
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- Listen Only Mode 220
- Preset Multiple Registers 220
- 9440500990 Rev D 205 221
- Preset Single Register 221
- Data Formats 222
- Modbus Parameters 224
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- Binary Points 225
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- Metering 234
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- 9440500990 Rev D 223 239
- Limiters 239
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- 9440500990 Rev D 225 241
- Setpoints 241
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- 9440500990 Rev D 227 243
- Global Settings 243
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- Relay Settings 244
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- 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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- PROFIBUS Parameters 262
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- 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
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- Contact Expansion Module 353
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- Revision History 365
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