myCNC Online Documentation

One of the most popular job for the PLC procedure is moving to given direction till input pin triggered.

It's used in

• Homing procedures,
• Probing,
• Tool Length measure
• Surface measure
• Gantry Alignment procedure
• and many others

This procedure can be handled in Hardware PLC. We offer M88 and M89 PLC procedures which do this job as a standard procedure. However, it can be customized easily according to customer needs.

M88.plc

//Watch on given sensor number, Soft Stop if sensor triggered
//used for homing, surface measure, tool length measure etc
 
main ()
{
 
  input=eparam&0xFFFF;	//P-parameter
  state=eparam>>16;	//L-parameter
  timer=0;
 
  message=PLCCMD_MOTION_CONTINUE;
  timer=30;do{timer--;}while(timer>0);
 
  ready=0;
 
  do {
    a=portget(input);
    if (state==0)
    {
      if (a==0) {ready=1;};
    };
    if (state!=0)
    {
      if (a!=0) {ready=1;};
    };
  }while(ready==0);
 
  message=PLCCMD_MOTION_SOFT_SKIP;
  timer=30;do{timer--;}while(timer>0);
 
  exit(99);
};