Local Variable

[MelsecMan]

Hi Friends!

Can someone explain to me?

Why this is not possible in a button script or Cicode script function?

TL_SVCountHlp = TL_SVCount;

TL_SVCountHlp is a Local Variable type INT.

TL_SVCount is a IO variable type INT.

[stuartm]

Hello,

What makes you think it is not possible? All things being equal, it should be possible. Are you getting some sort of error, or is it simply not working?

Stuart

[MelsecMan]

Simply not working.

I can assign a constant to the local variable, but not a IO variable value.

[Juan]

Hi,

Displays the two variables on the screen and presses the button, checks if the value of the local variable is updated with the IO variable.

You may have some problems:
1- That the IO variable is not being read due to communication problems.
2- That the value of IO is cache and not the current one.

If this test works, remove the variables from the screen and create a cicode function something like this:

INT
Function ReturnValue( INT vIO)
return vIO;
END

call it from the button:
vLocal = ReturnValue( vIO);

If it doesn't work, you should use the tag subscriptions functions.

Regards,

Juan

[stuartm]

You could also trace the values of the tags out to the syslog and ensure they are working

for example, put this in a function:

DebugMsgSet(1);  // turns on debug logging

DebugMsg("Before " + TL_SVCountHlp:#.# + "," + TL_SVCount:#.#);  // sends the current values to the syslog

TL_SVCountHlp = TL_SVCount;

DebugMsg("After " + TL_SVCountHlp:#.# + "," + TL_SVCount:#.#);  // sends the current values to the syslog

You could try doing a tagread:

Real rTagValue;

rTagValue = TagRead(TL_SVCount);

DebugMsgSet(1);  // turns on debug logging

DebugMsg("rTagValue " + rTagValue:#.#);  // sends the current values to the syslog

And see what pops out.

[MelsecMan]

Hi!

I have both values on display, IO-variable is updating, the local variable not.

A cyclic event calls my Cicode function with the assignment.

I have verified that that the function is executed.

I'am not on site. I will try your strange funcion 🙂 and read about "subscriptions" later.

/Stefan

[AntonioIacoviello]

Are you using Multiprocess?

Local variables have the scope in the process instance and will be not shared across processes.
If you use single process the behavior that you are experiencing may change.

[MelsecMan]

This crazy function solved my problem:

INT
Function ReturnValue( INT vIO)
return vIO;
END

/Thanks!

[m-plc-2023]

I quickly tried this on a test project that I have and seems to work fine, I dont see any issue.