#define command     var00
#define parameter   var01
//set Spindle speed control via DAC channel #1
//Spindle Speed is given in **eparam** register

main()
{
  value=eparam;
  if (value>0xFFF) {value=0xFFF;};      
  //fix if given value is out of range 0...0xfff
  if (value<0) {value=0;};

  dac01=value;   //setup DAC value


  //**Set Spindle Speed** is asynchronous operation. 
  //It's better to inform myCNC Software New Spindle Speed applied.
  //Send information about new Spindle Speed to myCNC Software
  message=PLCCMD_REPLY_TO_MYCNC;                   
  //Command code to send to myCNC software
  command=PLC_MESSAGE_SPINDLE_SPEED_CHANGED;       
  //Message code
  parameter=eparam;     //New Spindle Speed information
  timeout=timer+10; do { timer++; } while (timer<timeout); 
  //Delay to push the Message to myCNC Software

  gvarset(7371,eparam);           
  //myCNC register #7371 contains actual Spindle Speed. 
  //Another way to inform myCNC software about new Spindle Speed 
  //(to display on it DRO for example)

  exit(99);  //normal exit.
};