Table of Contents
Software 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.
General examples
Endless loop for G-code program
An endless loop can be made in Software PLC procedure. PLC procedure contains an endless loop. In the loop it checks the current status of myCNC controller, if the controller is in Idle mode and ready to run a new program, it reloads G-code file (if needed), reset current program pointer and starts running g-code.
PLC code is -
- ENDLESS.plc
main() { do { do{ a=gvarget(6065); }while(a!=0); //wait Motion Controller ready to accept new program gvarset(100001,1); //Reset G-code pointer to start timer=5; do{ timer--;}while(timer>0); //0.5 sec Pause gvarset(100002,1); //Start G-code }while(1); //endless loop exit(99); };
If Stop button pressed, g-code will be stopped, the procedure will see Motion controller is ready for next loop entry and restart g-code again. This behaviour can be inappropriate for many applications.
A simple solution is to add global variable single/auto and check this variable in the loop.
- NOT_ENDLESS.plc
main() { do { do{ a=gvarget(6065); }while(a!=0); //wait Motion Controller ready to accept new program gvarset(100001,1); //Reset G-code pointer to start timer=5; do{ timer--;}while(timer>0); //0.5 sec Pause gvarset(100002,1); //Start G-code }while(gvarget(400)==0); //endless loop, if #400==0, otherwise exit from procedure exit(99); }; //If variable #400 will be set to non-zero value, NOT_ENDLESS.plc process will be finished
In case no need to exit from ENDLESS.plc and variable #400 should be monitored constantly and run g-code when #400 is set bu user -
- ENDLESS2.plc
main() { do { if (gvarget(400)!=0) //if #400!=0, run g-code, otherwise continue to test #400 { do{ a=gvarget(6065); }while(a!=0); //wait Motion Controller ready to accept new program gvarset(100001,1); //Reset G-code pointer to start timer=5; do{ timer--;}while(timer>0); //0.5 sec Pause gvarset(100002,1); //Start G-code }; }while(1); //endless loop exit(99); }; //If variable #400 will be set to non-zero value, ENDLESS.plc process will be finished
Endless loop with switch to left & right sides of working area
- LEFT-RIGHT.plc
#define MAX_X 800 #define MAX_Y 800 main() { do { auto=gvarget(501); //Automatic mode if (auto) { do { rect_not_ready=gvarget(7369); }while(rect_not_ready==0); left_right=1; xmax=gvarget(7350); if (xmax>MAX_X){ left_right=0;}; ymax=gvarget(7351); if (ymax>MAX_Y){ left_right=0;}; gvarset(502,left_right); //502 - shows both sides or single side LR=gvarget(500); if (LR==0) //left { // gvarset(9100,1); //show message #1 //do{ a=portget(11); }while(a==0); //press pedal, port 11 //do{ a=gvarget(6065); }while(a!=0); //press pedal, port 11 // gvarset(9100,0); //clear the message portclr(10);//Vacuum Left OFF portset(9); // portset(11);// portset(22);// // gvarset(9101,1); //show message #2 //do{ a=portget(13); }while(a==0); //press pedal, port 13 // gvarset(9101,0); //убрать portset(10);//Vacuum Left portclr(9); // timer=5; do{ timer--; }while(timer>0); //wait 0.5 seconds while the vacuum is working portclr(11);//выключить упоры portclr(22);// //// //ждать пока УП завершится do{ a=gvarget(6065); }while(a!=0); //wait //// do { do{ a=gvarget(6065); }while(a!=0); //wait for the system to be ready gvarset(100010,54); //Дать код G54 timer=5; do{ timer--; }while(timer>0); //wait 0.5s for the system to switch n=gvarget(5220);//gets the current coordinate system number } while(n!=1); //while the current system is not G54 do{ a=gvarget(6065); }while(a!=0); //wait for the system to be ready gvarset(100001,1); //go to the beginning of the program timer=5; do{ timer--; }while(timer>0); //wait 0.5s do{ a=gvarget(6065); }while(a!=0); //wait for the system to be ready gvarset(100002,1); //start the program }else //right { // gvarset(9110,1); //show message #1 // do{ a=portget(12); }while(a==0); //press pedal, port 11 // gvarset(9110,0); //clear the message portclr(15); //Vacuum Left OFF portset(16); // portset(14); // portset(23); // // gvarset(9111,1); //show message #2 // do{ a=portget(14); }while(a==0); //press pedal, port 13 // gvarset(9111,0); //clear portset(15); //Vacuum Left portclr(16); // timer=5; do{ timer--; }while(timer>0); //wait 0.5 seconds while the vacuum is working portclr(14);// portclr(23);// //// do{ a=gvarget(6065); }while(a!=0); //wait //wait until the control program is finished //// do{ do{ a=gvarget(6065); }while(a!=0); //wait until the program is ready gvarset(100010,55); //assigns G54 coordinate system timer=5; do{ timer--; }while(timer>0); //wait 0.5 seconds while the coordinate system switch is happening n=gvarget(5220);//obtain the current coordinate system number } while(n!=2);//while the system is not G55 do{ a=gvarget(6065); }while(a!=0); //wait while the processor is busy gvarset(100001,1); //return to the beginning of the program timer=5; do{ timer--; }while(timer>0); //wait 0.5 seconds do{ a=gvarget(6065); }while(a!=0); //wait for the system to be ready gvarset(100002,1); //start the program }; timer=20; do{ timer--; }while(timer>0); //3 second pause do{ a=gvarget(6065); }while(a!=0); //wait until the program is complete LR=LR^1; //switch to the other side gvarset(500,LR); };//auto }while(1); exit(99); };
Jog Step (0.001, 0.01, 0.1 1.0) Indication with external LED display
There are global variables which represent current jog step size
Variable Name | Variable Number | Description |
---|---|---|
GVAR_JOG_STEP_SIZE | 5522 | prepresents current jog step size (double) |
GVAR_JOG_STEP_0_0001 | 7381 | the value is “1” if Current Jog Step Size is “0.0001”, otherwize is “0” (integer) |
GVAR_JOG_STEP_0_001 | 7382 | the value is “1” if Current Jog Step Size is “0.001”, otherwize is “0” (integer) |
GVAR_JOG_STEP_0_01 | 7383 | the value is “1” if Current Jog Step Size is “0.01”, otherwize is “0” (integer) |
GVAR_JOG_STEP_0_1 | 7384 | the value is “1” if Current Jog Step Size is “0.1”, otherwize is “0” (integer) |
GVAR_JOG_STEP_1_0 | 7385 | the value is “1” if Current Jog Step Size is “1.0”, otherwize is “0” (integer) |
GVAR_JOG_STEP_10 | 7386 | the value is “1” if Current Jog Step Size is “10”, otherwize is “0” (integer) |
Software PLC procedure can be made to handle LED display according to “Current Jog Step Size”.
- The procedure contains an endless loop.
- Variables a7382…a7385 keep previous state or “Current Jog Step Size”
- There are testing “Current Jog Step Size” global variables values, switching binary output if variables were changed and store new states in the a7382…a7385 local variables
- JOG_STEP_LEDS
main() { a7382=gvarget(7382); a7383=gvarget(7383); a7384=gvarget(7384); a7385=gvarget(7385); do{ if (gvarget(7382)!=a7382) { a7382=gvarget(7382); if (a7382==0){portclr(14);}else {portset(14);}; }; if (gvarget(7383)!=a7383) { a7383=gvarget(7383); if (a7383==0){portclr(13);}else {portset(13);}; }; if (gvarget(7384)!=a7384) { a7384=gvarget(7384); if (a7384==0){portclr(12);}else {portset(12);}; }; if (gvarget(7385)!=a7385) { a7385=gvarget(7385); if (a7385==0){portclr(11);}else {portset(11);}; }; }while(1); exit(99); };
Switching an output ON for a certain period of time
#define OUTPUT_TIMER 15 main() { count=0; do{ a=gvarget(7373); if (a!=0) { count++; if (count<30) { portset(OUTPUT_TIMER); } else { portclr(OUTPUT_TIMER); if (count>6000) { count=0; }; }; }else { portclr(OUTPUT_TIMER); count=0; }; }while(1); exit(99); };