Twincat 3 User info required

Hi everyone.

How i can declare this vaariable in twc3 ?


Thanks.

Might try here : https://infosys.beckhoff.com/englis.../1033/tc3_plc_intro/9007201784205195.html&id=

>>>
ARRAY
TwinCAT supports one-, two- and three-dimensional arrays of elementary data types. You can define arrays in the declaration part of a function block and in the global variable lists.

Only VAR_IN_OUT variables of function blocks, functions and methods can be declared with the data type of an array of variable length.

For variable-length arrays, the operators LOWER_BOUND (<array name>,<dim>) and UPPER_BOUND (array name,<dim>) provide the lower and upper bounds.



Syntax for declaring an array with a defined length:

<array_name> : ARRAY [<ll1>..<ul1>,<ll2>..<ul2>] OF <elem. type>

ll1, ll2, ll3 indicate the lower bound of a field dimension, ul1, ul2 and ul3 the upper limit. These limits must be integral values.

Example:

aCardGame : ARRAY [1..13, 1..4] OF INT;


Syntax for declaring an array with variable length:

<array_name> : ARRAY [*|, *|, *] OF <data type>;

Example:

//An diese Additionsfunktion können Arrays mit verschiedener Längen übergeben werden
FUNCTION F_Sum : DINT;
VAR_IN_OUT
aSample: ARRAY [*] OF INT;
END_VAR
VAR
nI, nSum2 : DINT;
END_VAR

nSum2 := 0;

//Die Länge des jeweiligen Arrays wird ermittelt
FOR nI:= LOWER_BOUND(aSample,1) TO UPPER_BOUND(aSample,1) DO
nSum2 := nSum2 + aSample[nI];
END_FOR;

F_Sum := nSum2;
Initialization of arrays
>>>

Poet.

I think the OP is looking for a way to declare two different variables, a bool and an array of bools, to point at the same memory location.

LadderLogic said:

I think the OP is looking for a way to declare two different variables, a bool and an array of bools, to point at the same memory location.

Click to expand...

Yes it's !

Maybe like this:

Archie said:

Maybe like this:

Code:

	in_0   AT %MX0.0 : BOOL;
	in_0_b AT %M0 : ARRAY [0..0] OF BOOL;

Click to expand...

I dont know Twincat, but it looks odd to me.

I am guessing that %MX0.0 and %M0 points to a global memory address.
in_0 is a VAR_INPUT, so it will get an address assignment when the block is called. That would conflict with a fixed global address assignment.

JesperMP said:

I dont know Twincat, but it looks odd to me.

I am guessing that %MX0.0 and %M0 points to a global memory address.
in_0 is a VAR_INPUT, so it will get an address assignment when the block is called. That would conflict with a fixed global address assignment.

Click to expand...

You are completely right. I overlooked the "INPUT", so linking to a marker address space will create overlapping memory issues amongst instances of function blocks.

If it not has to be declared to same memory location you can point in_0_b array with pointer in the program of function.