myCNC Online Documentation

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===== myCNC Timers =====

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myCNC controllers support up to 4 timers.

  * Each timer can be assigned to any output pin. 
  * Pulse time (in milliseconds) and Pause time (in milliseconds) can be setup for each timer
  * Timers can be enabled/disabled from myCNC software setup dialog or through number of Global Variable registers.

myCNC software configuration dialog to setup Timers is shown below

{{:mycnc:mycnc_setup:config-triggers-001-main.png}}

==== Global Variable Registers to control myCNC Timers ====

^ Variable Name ^ Address ^ Description ^
^ Timer0 ^  ^  ^
| GVAR_TIMER0_ENABLED | 8100 | Writing "0" to this register will disable Timer0, \\ writing "1" will enable Timer0 |
| GVAR_TIMER0_PORT | 8101 | Writing to this register will change Output pin connected to Timer0. Writing value is the Output Pin# |
| GVAR_TIMER0_PULSE | 8102 | A value written to this register is Timer 0 Pulse width in milliseconds |
| GVAR_TIMER0_PAUSE | 8103 | A value written to this register is Timer 0 Pause in milliseconds |
^ Timer1 ^  ^  ^
| GVAR_TIMER1_ENABLED | 8104 | Writing "0" to this register will disable Timer1, \\ writing "1" will enable Timer1 |
| GVAR_TIMER1_PORT | 8105 | Writing to this register will change Output pin connected to Timer1. Writing value is the Output Pin# |
| GVAR_TIMER1_PULSE | 8106 | A value written to this register is Timer 1 Pulse width in milliseconds |
| GVAR_TIMER1_PAUSE | 8107 | A value written to this register is Timer 1 Pause in milliseconds |
^ Timer2 ^  ^  ^
| GVAR_TIMER2_ENABLED | 8108 | Writing "0" to this register will disable Timer2, \\ writing "1" will enable Timer2 |
| GVAR_TIMER2_PORT | 8109 | Writing to this register will change Output pin connected to Timer2. Writing value is the Output Pin# |
| GVAR_TIMER2_PULSE | 8110 | A value written to this register is Timer 2 Pulse width in milliseconds |
| GVAR_TIMER2_PAUSE | 8111 | A value written to this register is Timer 2 Pause in milliseconds |
^ Timer3 ^  ^  ^
| GVAR_TIMER3_ENABLED | 8112 | Writing "0" to this register will disable Timer3, \\ writing "1" will enable Timer3 |
| GVAR_TIMER3_PORT | 8113 | Writing to this register will change Output pin connected to Timer3. Writing value is the Output Pin# |
| GVAR_TIMER3_PULSE | 8114 | A value written to this register is Timer 3 Pulse width in milliseconds |
| GVAR_TIMER3_PAUSE | 8115 | A value written to this register is Timer 3 Pause in milliseconds |


==== How to use Timers in Hardware PLC ====

Here is an example of Timer0 setup in PLC procedure

M169 is Timer0 initialization and start
<code C M169.plc>
main()
{
  gvarset(8101,1);  // Setup Out#1 as Timer0 output
  gvarset(8102,5);  // Pulse width is 5ms
  gvarset(8103,45); // Pause time is 45ms (Period is 5+45=50ms)

  gvarset(8100,1);  //Start Timer0
  exit(99);
};
</code>

M168 is Timer0 stop
<code C M168.plc>
main()
{
  gvarset(8100,0);  //Stop Timer0
  exit(99);
};
</code>

The result is shown on a picture below

{{mycnc:mycnc-timers-example-001.png}}