2 Visual Components Manuals

Introduction to Visual Components 2.3
endif
endif
3.3.8.32.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
unsigned long VC_HANDLE;
_CYCLIC void Cyclic(void)
{
if (!ready)
{
VC_HANDLE = VA_Setup(1 "vga"); ,
if (VC_HANDLE)
ready = 1;
}
if (ready)
{
if (!VA_Saccess(1,VC_HANDLE))
{
VA_Srelease(1,VC_HANDLE);
}
}
}
3.3.8.33 Manual Project Control − VA_StartProject
A stopped project can be started again with the VA_StartProject command.
A project can be stopped from the PLC program by the VA_StopProject function, or the 'Manual Project Start'
option could have been transferred. Starting a project manually allows driver parameters to be changed with
VA_SetUserParam, as well as other preparatory measures like variable initialization.
Using this, it is also possible to determine exactly when the visualization project is started. This can guarantee
that the machine can be operated immediately. In other words, the PLC program is finished initializing as soon
as the visualization application appears.
3.3.8.33.1 Parameter
I/O Parameter Type Meaning
IN enable BOOL This function is only executed if enable is TRUE.
IN VCHandle UDINT The handle returned by VA_Setup.
OUT Return Value UINT Not equal to 0 if error occurs
Warning:
VA_Saccess cannot be called before the VA_StartProject function.
3.3.8.33.2 Example for Automation Basic
(* init program *)
ready = 0
(* cyclic program *)
IF ready 1 THEN
VC_HANDLE = VA_Setup(1 "vga") ,
IF VC_HANDLE 0 THEN
ready = 1
ENDIF
ENDIF
IF ready = 1 THEN
3.3.8.32 Requirements and Initialization − VA_Srelease 167