Echelon i.LON SmartServer 2.0 Manuel d'utilisateur Page 97
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i.LON SmartServer 2.0 Programming Tools User’s Guide 83
Writing Data Point Values
You can write updated values to the scalar and structured data points declared in your FPM application
in the Work() routine. The updated values are then written back to the data points when the FPM
application exits the Work() routine. You can directly write an updated value to a scalar data point
by simply assigning it a value.
nviTemp = 25.28;
nviSetPoint = 22.22;
Writing an updated value to a structured data point requires a few additional steps. You can directly
write values to the fields of a structured data point and then mark the data point as modified, or you
can create temporary data point variables and use them to write values to the fields of your structured
data points. The following sections describe how to write values to a structured data point using each
of these methods.
Directly Writing to a Structured Data Point
To directly write a value to a structured data point, you use the -> operator (element selection through
pointer), and you then mark the data point as modified using the PROPAGATE()macro. The
following code demonstrates how to write to a structured data point using this method:
DECLARE(_0000000000000000_0_::SNVT_switch,
nvoAirConditioner_OnOff, OUTPUT_DP);
...
void CUFPTHVACController::Work()
{
// use variable directly and tell the system that this value /
should be written back to the data point
nvoAirConditioner_OnOff->value = 200;
nvoAirConditioner_OnOff->state = 1;
PROPAGATE(nvoAirConditioner_OnOff);
}
Using Temporary Data Point Variables to Write to a Structured Data Point
To use a temporary data point variable to write to a structured data point, you declare a temporary data
point in the Work() routine, store the desired values in the various fields of the temporary data point,
and then assign the declared data point a reference to the temporary data point variable. The following
code demonstrates how to write to a structured data point using this method.
DECLARE(_0000000000000000_0_::SNVT_switch,
nvoAirConditioner_OnOff, OUTPUT_DP)
...
void CUFPTHVACController::Work()
{
SNVT_switch tmp;
tmp.value = 200;
tmp.state = 1;
nvoAirConditioner_OnOff = tmp;
// change detected and written to data point automatically
}
See the
Programmer’s Reference in Appendix A for more information on writing values to structured
data points.
- SmartServer 2.0 1
- Table of Contents 3
- Preface 8
- Hardware Requirements 10
- SmartServer Requirements 10
- Related Reading 11
- Content 12
- Introduction 15
- FPM Types 16
- Creating and Deploying FPMs 16
- Quick-Start FPM Exercise 20
- 14 Introduction 28
- Programming Tools 37
- Importing FPM Projects 44
- Creating FPM Templates 55
- Creating a Model File 70
- Declaring Functional Blocks 72
- Using Include Directives 73
- Example Model Files 73
- Saving your Model File 76
- Other Command Switches 78
- Creating FPMs 79
- Creating FPMs Overview 80
- Creating New FPM Projects 81
- Creating an FPM 82
- Using UFPT Local Variables 89
- Writing an FPM Application 90
- Starting Timers 91
- Using the Start() Method 91
- Reading Data Point Values 95
- Reading Scalar Data Points 95
- Writing Data Point Values 97
- Writing an FPM Driver 100
- { 102
- Compiling an FPM 103
- Using Non-Latin Characters 104
- Debugging FPMs 105
- Using Wind River Workbench 106
- Using SNMP Support 116
- ONWORKS network. It 119
- FPM Deployment Overview 120
- Deploying FPM Applications 125
- Deploying FPM Drivers 125
- ONWORKS network 126
- ONWORKS connections 126
- ONWORKS connections, or 126
- ONWORKS 126
- ONWORKS channel, and then 128
- Commissioning FPM Devices 134
- Recommissioning FPM Devices 135
- Testing FPM Applications 136
- Connecting FPM Data Points 136
- ONWORKS Connections 137
- Creating Web Connections 141
- Updating FPMs 152
- Updating Device Interfaces 153
- Licensing Overview 160
- ONMARK ID 161
- Creating a Security DLL File 163
- Verifying the Lock ID 170
- Verifying the License Key 172
- Supplying FPMs to Customers 178
- Interface 181
- Translating Property Files 199
- Appendix A 217
- FPM Programmer’s Reference 217
- Overview 218
- Template Files 218
- Routines 218
- Initialize() 219
- Work() 219
- OnTimer() 220
- FPM Application 221
- FPM Driver 221
- Methods 222
- Changed() 223
- NotifyOnAllUpdates() 224
- Propagate() 224
- Write() 225
- ResetPriority() 225
- SetDpProperty (UCPTpriority) 230
- SetDpProperty(defOutput) 230
- UFPT Local Variables 231
- Timer Methods 235
- Expired() 236
- Stop () 237
- StopAllTimers() 237
- IsRunning() 237
- Reboot Method 238
- RS-232 Interface Methods 239
- RS-485 Interface Methods 243
- ONWORKS directory 244
- File Access Methods 247
- if(iTemp) 248
- Appendix B 251
- Checklist 251
- ONWORKS channel 253
- Appendix C 255
- FPM FAQ 255
- SmartServer FPM FAQs 256
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