//Turn on Spindle clockwise
//set Spindle speed control ET10 DAC channel #2
#include pins.h  //defines for pins numbers
#include vars.h  //defines for variable names

main()
{
  timer=0;
  value=eparam;

  command=0x32;//EXT_ET5_DAC_OFFSET
  parameter=0x800-(eparam/2)+(2<<12);//channel #2
  message=PLCCMD_SET_CNC_EXTVAR;
  texit=timer+2;do{timer++;}while(timer<texit);

  portclr(OUTPUT_CCW_SPINDLE);
  portset(OUTPUT_SPINDLE);


  gvarset(7370,1);         
  //Global Register #7370 shown actual Spindle state (0=OFF, 1=ON).
  //Set Register value when Spindle is ON
  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)


  //**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



  //Wait till Spindle Rotation Speed comes to good values before next motion started
  timeout=timeout_on_delay+timer;
  do{timer++;}while (timer<timeout);               //delay for Spindle reach given speed

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