B&B Electronics VFG3000 - Manual - Manual (Page 131)

C ONFIGURING A V IRTUAL HMI P RIMITIVE D ESCRIPTIONS
R EVISION 1 P AGE 115
The first step is achieved using the system variable Data . This system variable is only
available for the OnHelp field and contains information on the alarm selected. Data is a Long
(Double word) and contains the following information:
• Low word: the tag index this alarm is related to.
• High word: the alarm number for this tag. (Remember, there are two alarms per
tag.
The second step is thus achieved by running a program with Data as argument. A program
has to be created first and set up to accept an integer argument as show in the image below.
Now the OnHelp field is ready to accept the following code. This tells the viewer to run
Program1 with the information provided in Data when the Help button is pressed.
Program1(Data)