SCL - Read OB Temp Data

Hi,

I have quick question regarding to read and evaluate Temp variables in fault OBs.

I need to come up with an SCL block what is called in CFC and called in multiple fault OBs(with the tasklist attribute). When it gets called it evaluate the Event_Class and the diagnostic address to identify the fault location.

The idea is to have a shared DB where every HW element in the HW config have a flag, and when a fault OB get called with the relevant diagnostic address the relevant flag get set. I am not too sure how to read the temp variables of the calling fault OB.

It is quiet funny but I have not find reference for anything like this. I am sure there is an easy way to do it.

Cheers

MicroMan

Hi,

I have quick question regarding to read and evaluate Temp variables in fault OBs.

I need to come up with an SCL block what is called in CFC and called in multiple fault OBs(with the tasklist attribute). When it gets called it evaluate the Event_Class and the diagnostic address to identify the fault location.

The idea is to have a shared DB where every HW element in the HW config have a flag, and when a fault OB get called with the relevant diagnostic address the relevant flag get set. I am not too sure how to read the temp variables of the calling fault OB.

It is quiet funny but I have not find reference for anything like this. I am sure there is an easy way to do it.

Cheers

 Hello,

You can try :

1. To gather as much as data from OB start information  via SFC6 for S7-300/400
   
   
2. Use other system function to extract the data that is not possible to get via SFC6.As an example here, SFC51 is one of those functions.

I hope this helps,

Hamid Hosseini

Hello Microman,

Is this what you need? Now, the code reads only OB100, but you can also make an OR statement to know when OB81,86 etc is called.

VAR_TEMP
TOP_SI              :STRUCT //Structure for SFC6    
    EV_CLASS        :BYTE;
    EV_NUM          :BYTE;
    PRIORITY        :BYTE;
    NUM             :BYTE;
    TYP2_3          :BYTE;
    TYP1            :BYTE;
    ZI1             :WORD;
    ZI2_3           :DWORD; 
END_STRUCT;   
START_UP_SI         :STRUCT //Structure for SFC6   
    EV_CLASS        :BYTE;
    EV_NUM          :BYTE;
    PRIORITY        :BYTE;
    NUM             :BYTE;
    TYP2_3          :BYTE;
    TYP1            :BYTE;
    ZI1             :WORD;
    ZI2_3           :DWORD; 
END_STRUCT;
ERR                 :INT;    
END_VAR

BEGIN

//==========================================================
//INITIALISATION
//==========================================================

//Call Read Startup Info OB
ERR :=RD_SINFO(TOP_SI :=TOP_SI, START_UP_SI :=START_UP_SI);       
           
//Activate when OB100 is running
IF(TOP_SI.NUM = 100)
   THEN ;  //TYPE YOUR CODE HERE            
END_IF; 

Dear HdHosseini, Oreca,

Thank you very much for your post, both posts were very helpful. 5 Star!

Regards