1.3 Initialization Implementing an initialization sequence It is usually required to initialize various parameters at the initial call of your block. The block may also contain additional tasks it only has to execute once, depending on the technological function of your block. If this is the case in your block you must implement an initial startup sequence. This is done by defining a BOOLEAN variable, for example sbRESTART, which can be implemented as static variable.  Your block is not only initialized when you restart the system, but also when you reload it while the CPU is in RUN. It is for this reason that you have to integrate the initial startup sequence in the cyclic section of your block. You may therefore, if necessary, distribute the initial startup sequence to several call cycles of the block.  //**************************************************************************** // Dependency on the calling OB //****************************************************************************  // Reading the start info by calling SFC6 (RD_SINFO)  

 DUMMY := RD_SINFO (TOP_SI := TOP_SI, START_UP_SI := START_UP_SI);  

 IF sbRESTART THEN   // Initialization sequence      

TOP_SI.NUM := 100;     // Execution of the initialization sequence as restart   

sbRESTART := FALSE;    // Reset initialization sequence   

END_IF; 

// Which OB called the block?  

 CASE WORD_TO_INT(BYTE_TO_WORD(TOP_SI.NUM)) OF  //**************************************************************************** 

// Handling of error OBs //****************************************************************************     

 // OB80: Timeout error     

80:     QH_ALM  := 0;          

 // Reset error outputs     

QL_ALM  := 0;  //**************************************************************************** 

// Startup 

//****************************************************************************      

// OB100: Restart     

100:     QH_ALM  := 0;           

// Reset error outputs     

QL_ALM  := 0;     

siRUNUPCNT := RUNUPCYC;  // Save RUNUPCYC value