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I want to try VBS programming in WINCC6.2 and calculate the real-time bad rate of production equipment. I have two plc variables: a1 (unsigned32int), a2 (unsigned16int), and WINCC6.2 script variable a3 (scripttagfloat32). I want to calculate once every minute: a3=a2/a1*100. How can VBS be programmed to achieve this function?
A: First create the variables tag1, tag2, tag3 in a1, a2, a3.vbs:
Dimmytag, mytag1, mytag2
Mytag=hmiruntime.tags("tag1").read
Mytag1=hmiruntime.tags("tag2").read
Mytag2=mytag1/mytag*100
Hmiruntime.tags("tag3").writemytag2

The above script is placed in wincc's global vbs script, setting the trigger period to 1 minute.