Echelon i.LON SmartServer 2.0 - Manual (Page 223)

i.LON SmartServer 2.0 Programming Tools User’s Guide 209
Variable Type Size
unsigned long 32 Bits
long 32 Bits
unsigned int 32 Bits
int 32 Bits
float 32 Bits
double 64 Bits
Internal FPM Data Point Methods
For the data points declared in an FPM application or FPM driver, you can use the
Changed()method
to determine if a data point value has been changed, and you can use the
NotifyOnAllUpdates()
method to modify the Changed() method so that it checks whether
any data point property has been updated, including value, status, time of last update, and priority.
You can use the PROPAGATE()macro to write values to a structured data point.
For data points declared in an FPM application, you can use the ResetPriority()method to set
and reset the priority used by the module to write values to a data point.
You can use these internal data point methods in the Work() and OnTimer()routines of an FPM
application or driver.
FPM Scope
Internal Data Point
Method
Initialize() Work() OnTimer() Shutdown
Changed() —
FPM Application
FPM Driver FPM Application
FPM Driver
—
NotifyOnAllUpdates()* — — — —
Propagate() —
FPM Application
FPM Driver FPM Application
FPM Driver
—
ResetPriority() —
FPM Application FPM Application
—
*Declared in constructor of FPM Application or FPM Driver
Changed()
You can use the Changed() method in the Work() and OnTimer()routines of an FPM
application or driver to determine whether the value of a data point has changed.
SYNTAX
bool Changed(const CVariable& rVar)
The rVar parameter specifies a data point declared in the FPM. If the value of the specified data
point has changed, this method returns a true value; otherwise, it returns a false value.
EXAMPLE
The following example demonstrates how you can use the Changed()method to check whether
the values of the data points in your FPM have changed.
void CUFPT_FPM_Application::Work()
{
if (Changed(x) || Changed(y))
{
//insert code here
}