C script execute both side of If else statement in WinCC V7.2

Dear expert,

I am fighting a nasty bug in a c script.

I am using an if else statement and it compile OK.

But in runtime, the else statement is always executed.

Exemple:

End of example

As BR7S20_1 = 0, the production start OK. 

But I do not see the message "START PRODUCTION". Instead I have "ALREADY IN PRODUCTION".

What I have done wrong?

Hello,

what exactly you want to do? 

Can you explain better?

I did some variable display in WinCC.

The customer had a Spare PC with with WinCC installed. So I updated the WinCC project in the spare PC and swapped the PC. Seem that in the spare PC, everything is OK.

Hi BABYCN,

If the Tag COMLIA_MSG is all the time ALREADY IN PRODUCTION

than the tag BR7S20_1 is all the time different from 0

GetTagSWord Determines the value of a tag of data type "signed 16 bit".

Make any printout massgaes with the c-commad printf(); and check the messages in

The diagnostic window

Best regards

schufri

Hi BABYCN,

How often do You call the script ?

Cause every time when if code is executed You change the value of BR7S20_1 to 20. So in next call, it's goes into else condition.

So if You call it very often, f.e. less than 1s You can miss that "START PRODUCTION" is displayed, cause it's on one program cycle displayed.

If inside if executes only one instruction

Best regards,

Rafał