Var declaration AT %MW...voiding memory overlapping

2020-02-27T23:26:52.316000Z

I found that each timer uses 4 DINT's.

So I would put the timer names in a spreadsheet and add the %md** in the column next to them. Fill out the first 2 or 3 names and addresses then drag the cells down to have the spreadsheet auto-fill the rest of the memory names. In this way you can determine where each timer memory starting point will fall.

Var declaration AT %MW...voiding memory overlapping

2020-02-27T23:26:50.630000Z

I know it's easier to define FB without physical memory addressing, but I need it..

Var declaration AT %MW...voiding memory overlapping

2020-02-27T23:26:46.005000Z

hki75 hat geschrieben:
Hi Jonascox,
thanks for reply.
I try to insert your suggestion into Codesys but it doesn't work..for the following reasons:
TON (timer cannot to be defined AT odd address %W:
ex:
Timer1 AT %MW1 : TON; --> return error compiler 3729
Defining
Timer1 AT %MW0 : TON;
Timer2 AT %MW2 : TON;
--> compiler return:
the only way I found to void memory overlapping during compiling is this:
Timer1 AT :TON;
Timer2 AT :TON;
(it seems each timer needs 6 dword memory allocation)
But my question was: how to know it in advance without try with different data type (MB or MW or MD...) and compiling every time until I get

Is there a reason you need the TON's defined at an absolute memory location?

It is much simpler to define them without an absolute address.

Example:

Timer3:TON;

The timer bits can be used in your code directly. They are predefined and shouldn't be added to any variable list.
Example:

Timer3.Q (Done Bit)
Timer3.ET (Elapsed Time)
Timer3.PT (Preset Time*)
Etc.

Var declaration AT %MW...voiding memory overlapping

2020-02-27T23:26:44.363000Z

Hi Jonascox,
thanks for reply.
I try to insert your suggestion into Codesys but it doesn't work..for the following reasons:

TON (timer cannot to be defined AT odd address %W:
ex:
Timer1 AT %MW1 : TON; --> return error compiler 3729

Defining
Timer1 AT %MW0 : TON;
Timer2 AT %MW2 : TON;
--> compiler return:

the only way I found to void memory overlapping during compiling is this:
Timer1 AT %MD0:TON;
Timer2 AT %MD6:TON;

(it seems each timer needs 6 dword memory allocation)
But my question was: how to know it in advance without try with different data type (MB or MW or MD...) and compiling every time until I get

Var declaration AT %MW...voiding memory overlapping

2020-02-27T23:26:42.719000Z

hki75, unlike Siemens, you don't need to offset your variables of like kind.

Timer1 AT %MW0 : TON;
Timer2 AT %MW1 : TON;
Word3 AT %MW2 : word;

However, if you use Bytes as a starting point, you can overlap memory. Like this:

Word1 AT %MB0 : Word;
Word2 AT %MB2 : Word;
Word3 AT %MB3 : word; ( This variable will be overwritten by the variable starting at %MB2 )

Var declaration AT %MW...voiding memory overlapping

2020-02-27T23:26:38.119000Z

I need to declare some variable mapped to %M address, something like:

Timer1 AT %MW0 : TON;

The question is: how to know the right offset for each variable to void memory overlapping?
ex:
Timer1 AT %MW0 : TON;
Timer2 AT %MW ?? : TON;

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