Access with 2 variables to the same address

Hi,

I would like to know if it would be possible as it is in C++ to access with 2 different variables to the same address ?

It means the second variable is like an alias of the first one.

 Are you talking of a C++ union ? Then STRUCT_OVERLAY STRUCT OVERLAP.

Hi!

I don't know exactly what you are asking for, but you have to know that you must not write an output more than once per scan.

But why do you want to do that? Can you explain us the reason to help you more accurately?

Also, take a look at this topic. It may help you: Using outputs more then once

Regards

Hi Jacek d,

no it isn't, it is a reference to the same address from 2 variables, the declaration looks like that :

type_var Var1

type_var &Var2 = Var1

But finally after further consideration I do not think that it would solve my problem.

Thanks anyway for your input.

AutoGen_428733

type_var Var1

type_var &Var2 = Var1

Simotion ST with OOP extensions enabled: 

Var1 : type_var;

Var2 : REF_TO type_var;

Var2 := REF(Var1); // not sure if this can be done in declaration

AutoGen_428733

But finally after further consideration I do not think that it would solve my problem.

Describing the actual problem might be a way to find its solution.

Hi StalinCode
 

I have a modular program with control modules declared as array of structure type on PLC side, but the index of the control modules is not fixed it depends on the machine.
For example the Tearing Axis control module could have the index 10 for a machine and 5 for an other one.
But in the HMI TP1200 I can not use directly the variables from the array otherwise I would need to update de connection for each machine.
So the idea was to declare an additionnal variable for the HMI side with the same type and same address with the fixed name of the control module "Tearing Axis" and then both side can simply read and write.

But As I said finally it would not help in my case...

Thanks very much for your input.

Best regards

Jacek d,

Yes I see what you mean but in that case Var2 is just a pointer to a type_var but not a variable with the type typa_var ...
So you put the adrdress of Var1 into Var2 butno more ...

Thanks very much for your input.

Best regards.

And Yes i am using a SIMOTION D445-2 on my machine I just realized that I forgot to mention it.