Goodmorning,

I need to understand how the smarttags actually work.

I found on the forum the same problem that I have encountered, in different year, but no solution.

For Example:

If I want to write a SmartTag in a loop or iteration everything is fine

For i = 0 to 15 step 1

Smarttags("VariableOut" & Cstr(i)) = i

next

But if I want Read a smartTags it compute but does not do the job

For i = 0 to 15 step 1

Smarttags("VariableOut" & Cstr(i)) = Smarttags("VariableIn" & Cstr(i)) 

next

The compiler notice if there is or there isn't the correct smartTags, but it always write 0, no matter what.

I am not the only one on the forum that has this problem. Please can someone help me to understand or bypass the problem?

meeda

HelloWhoppertje

I noticed something now using S7315-2DP and WinCC TIA V13 SP1:

• If I generate an internal tag dynamically and write value to it then it does the job.
• If I generate an internal tag dynamically and read value from it then it does the job.
• If I generate an external tag dynamically and write value to it then it does the job.
• If I generate an external tag dynamically and read value from it then it fails.

I configured TP1200 Comfort and connected its simulation with the PLC via PC Adapter(MPI).

Perhaps the experts can confirm and explain??

If it helps, you may use rate button.

https://support.industry.siemens.com/tf/ww/en/posts/smarttags-in-for-loop-stop-working-after-the-third-loop/167917/?page=0&pageSize=10

Thank You for the support

This would work only if the tags with these names exist, are "standard" tags or structure elements that are used also from somewhere else.

This would not work inside a Faceplate.

Thanks for helping me.

Unfortunatly I'm not using Faceplate.

What do You mean for Standard? 

In my case I'm using one group that are internal variable and the other group are linked to the PLC.

Both of them exist, if I try to misspell the name of the variable Tia Portal warn me about that when I run the runtime. 

If I write the correct name like Variable1 work without problem, if  I write Variable & i stop working.

I don't understand why?

Thanks Murof

Yes, the option was already checked.

Load names was enabled.

Any other suggestion?

I don't have any System Message.

I try to compile only the code and nothing show in the System Message.

I try to compile the project ,and again, nothing show in the System Message.

I tried a little experiment during this days.

I tried to insert a variable not present, to see if there is an error during the concatenation of the string. I insert a variable that i'm sure it's not present, like VariableOUT21 for example.

An error show up thar say:

"An unhandled exception('no tag 'VariableOUT21') occured in HmiRTm.exe [9344] "

If the name is correct no warning and no error appear.

Hope that give a hint.

I found a solution.

I change the variable acquisition time

From

Cyclic in operation - 1 s

to 

Cyclic continuous - 100 ms

and finally works

Now I have some question.

Why I have to run in continuous mode? How does that change the performance on the HMI pannel?

Is there a Timeout limit?

Thanks for the support!

Cyclic in operation only reads the Tag from the address if it is used on the screen.

Such usage as you have implemented here cannot be determined by the RT it seems.

Ok I will try some other setting to understand how different setting change the performance.

Thanks for the support.