[Beremiz-devel] Generating the code for initialization variables

[Beremiz-Devel mailing list]

Hi, All!

Generating the code for initialization variables

I have a problem:
There is a global variable that is referenced to a variable from the Canfestival. For example %IV0.0.8192.1. Field init value - empty.
But in the code I see the following:

IEC.code :
CONFIGURATION config
  VAR_GLOBAL
    CONF : UINT := 1;

    DO4 AT %QW0.0.25344.4 : UINT;
    DO5 AT %QW0.0.25344.5 : UINT := 0;
  END_VAR
 
  
In config.c file:  

  void config_init__(void) {
  BOOL retain;
  retain = 0;
  __INIT_GLOBAL(UINT,CONF,__INITIAL_VALUE(1),retain) 

  
  __INIT_GLOBAL_LOCATED(CONFIG,DO4,__QW0_0_25344_4,retain)
  __INIT_GLOBAL(UINT,DO4,__INITIAL_VALUE(0),retain)  - WHY init 0?
  
  __INIT_GLOBAL_LOCATED(CONFIG,DO5,__QW0_0_25344_5,retain)
  __INIT_GLOBAL(UINT,DO5,__INITIAL_VALUE(0),retain
  

Why (correctly?) with an empty field "Init value" initialize a variable?

Thank!

Best regards,

Aleksandr Safronov!

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[Beremiz-Devel mailing list]

On 18-03-20 11:49, [hidden email] wrote:

> Hi, All!
>
> Generating the code for initialization variables
>
> I have a problem:
> There is a global variable that is referenced to a variable from the
> Canfestival. For example %IV0.0.8192.1. Field init value - empty.
> But in the code I see the following:
>
> IEC.code :
> /CONFIGURATION config //
> //  VAR_GLOBAL //
> //    CONF : UINT := 1; //
> /
>
> /DO4 AT %QW0.0.25344.4 : UINT; //
> //    DO5 AT %QW0.0.25344.5 : UINT := 0; //
> //  END_VAR //
> /
>
> In config.c file:
>
>   void config_init__(void) {
>   BOOL retain;
>   retain = 0;
>   __INIT_GLOBAL(UINT,CONF,__INITIAL_VALUE(1),retain)
>
>
>   __INIT_GLOBAL_LOCATED(CONFIG,DO4,__QW0_0_25344_4,retain)
>   __INIT_GLOBAL(UINT,DO4,__INITIAL_VALUE(0),retain)  - WHY init 0?
>
>   __INIT_GLOBAL_LOCATED(CONFIG,DO5,__QW0_0_25344_5,retain)
>   __INIT_GLOBAL(UINT,DO5,__INITIAL_VALUE(0),retain
>
>
> Why (correctly?) with an empty field "Init value" initialize a variable?
>
> Thank!
>
> Best regards,
>
> Aleksandr Safronov!

Hi Aleksandr,

if "init value" is empty, then according to the standard IEC 61131-3 variable
should be initialized to default value for variables of this type.
What other would you expect for global variables?
This is the same as in C. ;-)


--
Best regards,
Andrey Skvortsov

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