myCNC Online Documentation

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==== PLC Examples ====

//**NOTE**: The myCNC team recommends utilizing the examples provided in this manual (as well as other manuals in this documentation) as a starting point for your machine setup. When possible (and applicable), it is recommended to keep changes to a mininum. In general, using these examples as the basis for your PLCs/macro commands allows for an easier setup process.//

=== Spindle Speed control for DAC ===
<code c SPN.plc>
#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=val;                            //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.
};
</code>


=== Spindle Speed control for ET10_DAC Examples ===
<code c SPN.plc>
#define command     var00
#define parameter   var01
//set Spindle speed control via ET10 DAC channel #1
//Spindle Speed is given in **eparam** register

main()
{

  command=0x32; //EXT_ET10_DAC_OFFSET; set ADC offset register address
  parameter=0x800-(eparam/2)+(1<<12);
  //0x800 - is the middle of 12bits range - represents 0V
  //Eparam contains 12bits DAC value in 10V range, 
  //ET10 DAC setup in +10V...-10V range, so need half range (/2)
  //Encoder channel number is given in high 12 bits of 16bit word  -
  //Channel #1 is (1<<12).

  message=PLCCMD_SET_CNC_EXTVAR;    
  //setup Message register with command for access to [[External CNC Variables]]
  texit=timer+2;do{timer++;}while(timer<texit);
  //2ms delay to push the command from PLC to myCNC Core


  //**Set Spindle Speed** is an asynchronous operation. 
  //It's good to inform myCNC Software New Spindle Speed applied.
  //Send information about new Spindle Speed to myCNC Software
  //myCNC register #7371 contains actual Spindle Speed. 

  gvarset(7371,eparam);           
  timer=30; do { timer--; } while (timer>0); //Delay to push the Message to myCNC Software
  //A way to inform myCNC software about new Spindle Speed (to display on it DRO for example)


exit(99);  //normal exit.
};
</code>


=== Spindle Speed control Example for ET15 DAC===
<code c SPN.plc>
#include vars.h

#define ADC_CHANNEL 1

main()
{
  speed=eparam/2;
 
  command=0x32; //set ADC offset register address
  parameter=0x800+(speed)+(ADC_CHANNEL<<12);
  message=PLCCMD_SET_CNC_EXTVAR;    timer=2;do{timer--;}while(timer>0);

  gvarset(7371,eparam);   timer=20;do{timer--;}while(timer>0);
 
  exit(99);  //normal exit.
}; 


</code>


=== ET15 Spindle control examples ===

== Spindle Speed control Example for ET15 DAC==
<code c SPN.plc>
#include vars.h

#define ADC_CHANNEL 1

main()
{
  speed=eparam/2;
 
  command=0x32; //set ADC offset register address
  parameter=0x800+(speed)+(ADC_CHANNEL<<12);
  message=PLCCMD_SET_CNC_EXTVAR;    timer=2;do{timer--;}while(timer>0);

  gvarset(7371,eparam);   timer=20;do{timer--;}while(timer>0);
 
  exit(99);  //normal exit.
}; 


</code>

== M03 - Spindle ON Example for ET15 DAC ==
<code c M03.plc>
//Turn on Spindle clockwise
#include pins.h
#include vars.h

#define ADC_CHANNEL 1

main()
{
  timer=0;
  proc=plc_proc_spindle;

  speed=eparam/2;
 
  command=0x32; //set ADC offset register address
  parameter=0x800+(speed)+(ADC_CHANNEL<<12);
  message=PLCCMD_SET_CNC_EXTVAR;    timer=2;do{timer--;}while(timer>0);

  portset(OUTPUT_SPINDLE);

  gvarset(7370,1); timer=30;do{timer--;}while (timer>0); //Spindle State
  gvarset(7371,eparam); timer=30;do{timer--;}while (timer>0); //Spindle Speed Mirror register

  //delay after spindle started
  timer=spindle_on_delay; do{timer--;}while (timer>0); //delay for Spindle reach given speed

  exit(99);	//normal exit 
};


</code>


== M05 - Spindle OFF Example for ET15 ==
<code c M05.plc>
//Turn on Spindle clockwise
#include pins.h
#include vars.h

#define ADC_CHANNEL 1

main()
{

  portclr(OUTPUT_SPINDLE);
  portclr(OUTPUT_CCW_SPINDLE);

  proc=plc_proc_idle;
  
  speed=0;

  command=0x32; //set ADC offset register address
  parameter=0x800+(speed)+(ADC_CHANNEL<<12);
  message=PLCCMD_SET_CNC_EXTVAR;    timer=2;do{timer--;}while(timer>0);

  gvarset(7370,0);  timer=30;do{timer--;}while(timer>0); //Spindle State
  gvarset(7371,0);  timer=30;do{timer--;}while(timer>0); //Spindle Speed


  timer=spindle_off_delay;
  do { timer--; } while (timer>0);

  exit(99);  //normal exit 
};

</code>