help about indirect tag and dot field value

hlpang said:

Hi guys, I write a script on a button's action:

interlockcheck5 is a indirect tag(I/o descrete),
gassing_hood_in and gassing hood out are (I/o descrete) B3:20/1 and B3:20/2 .
the script does not work well.


interlockcheck5.Value = gassing_hood_in.Value OR gassing_hood_out.Value ;

does anyone know why or what is the right script ?

Click to expand...

hlpang said:

interlockcheck5.Value = gassing_hood_in.Value OR gassing_hood_out.Value ;

Click to expand...

hlpang said:

interlockcheck5 is a indirect tag(I/o descrete),

Click to expand...

joaco1993 said:

Do you want to have 1 in interlockcheck5 if gassing_hood_in is in 1 or gassing_hood_out is in 1 ??

If this is the case, use an if then else:

if gassing_hood_in==1 or gassing_hood_out==1 then
interlockcheck5=1;
else interlockcheck5=0;
endif;

Click to expand...

SandwichMagic said:

I do believe that that is your problem. Your script is saying "Set the value of either gassing_hood_in OR gassing_hood_out to the value of interlockcheck5." But what determines which one it uses?? You have to tell it what to do in what situation. What do you want it to do is the first question we gotta get out of the way before we can help you.

Also, This part of your statement is a little bit confusing to me.



What do you mean by an indirect tag? If it is really an indirect tag, there is a whole tag type that is "Indirect Discrete". You set the .name value of the tag to determine which tag it actually is pointing to. I just found it strange that its an indirect tag but its IO discrete. Unless its indirect in the PLC, then it makes a little more sense.

Another tip as well, most of the time when you want to look at a value of a tag, the .value that follows the tag is implied if you just put the tag name. It's only if you want to look at a specific aspect of a tag (like .name as I mentioned above, .comment to examine the comment of the tag, etc.) that you would need to specify down to the dotlevel.

I hope I've been helpful!

Click to expand...