Siemens WinCC Checkbox Set & Reset Bit

Hello Everyone!!!

Dear Experts:beerchug:,

I am new to Siemens WinCC. I have created one Internal Tag 100_XV_01 (Unsigned 32-Bit), All I want to do is, If I check the Checkbox it should Set Bit 0 of the Tag and If i uncheck the checkbox it should Reset Bit 0. Same thing I would like to do with the Push button linked with PLC Tag. Please help me out to solve this issue.

I will be grateful for your kind guidance on the mentioned subject.

Use a switch.
It wont look like a checkbox, but it will have the same functionality.

Thank you sir for you response.
Switch button is not there in WInCC 7.2. There is only Button (Momentary)we can make it switch by activating the Latch Down Property. But In this case how to Link a Tag 100_XV_01 (Unsigned 32-Bit) to set and Reset the Bit 0 for Press and Release of PB respectively???

Maybe this will help
https://www.automation.siemens.com/forum/guests/PostShow.aspx?PostID=212938&Language=en&PageIndex=1

You need two functions to achieve what you want GetPropWord and SetTagDWord.
GetPropWord reads properties (word value) of objects.

Place your script in miscellaneous>Object change of your check box.

First you need to know if your check box is checked or not.
You can do it like this
selected is word type variable.
If selected = 1 check box is checked, if selected = 0 it is not checked.
Basically:
Now when you know when to set and reset bit in your tag you need to do it.
To set bit you need:

tag_val=GetTagDWordWait(TAG); //TAG is your unsigned 32bit tag
temp=tag_val|1; //OR your tag with 1 to set first bit
SetTagDWordWait(TAG, temp); wright new value to tag

Click to expand...

To reset bit you need:

tag_val=GetTagDWordWait(TAG); //TAG is your unsigned 32bit tag
temp=tag_val&0xFFFE; //AND your tag with 32bit value where all bits ecxept 1st are set to 1 to reset first bit
SetTagDWordWait(TAG, temp); wright new value to tag

Click to expand...

tag_val and temp are DWORD type varialbles.
You can declare variables like this:
put these lines right before main code.
Put it all together and you'll have working script.

Thanks a bundle Mr. Moggie, Mr. Marcius and Mr. JesperMP for your kind assistance. I have tested the mentioned things and it worked, thanks a lot once again!!!