+AXOpen.Timers
+
+AXOpen.Timers provide implementations of basic timers used in PLC programming. Timers are implemented in separated classes within corresponding methods.
+Functionality of Timers is based on Real Time Clock implementation provided from AXContext.
+AxOpen.Timers.OnDelayTimer
+OnDelayTimer class contains OnDelay method, where logic of OnDelayTimer is implemented. OnDelay method has following input:
+VAR_INPUT
+ Parent : IAxoObject; // or IAxoContext, parent provides RTC implementation
+ inSignal : BOOL; // starts timer with rising edge, resets timer with falling edge
+ TimeDelay : LTIME; // time to pass, before output is set
+END_VAR
+
+The OnDelay method returns output, which is TRUE, TimeDelay seconds after rising edge of inSignal is detected.
+The OnDelayTimer have also public variables which can be used to access timer results:
+VAR PUBLIC
+ output : BOOL; // is TRUE, TimeDelay seconds after rising edge of inSignal is detected.
+ elapsedTime : LTIME; // elapsed time
+END_VAR
+
+The LOGIC of OnDelayTimer is following:
+If inSignal is FALSE, output is FALSE and elapsedTime is 0. As soon as input becomes TRUE, the time will begin to be counted in elapsedTime until its value is equal to TimeDelay. It will then remain constant. The output is TRUE when inSignal is TRUE and elapsedTime is equal to TimeDelay. Otherwise it is FALSE. Thus, output has a rising edge when the time indicated in TimeDelay has run out.
+Example usage of OnDelay timer:
+USING AXOpen.Timers;
+
+
+VAR
+ _signal : BOOL; // input signal
+ _testTimerOnDelay: AXOpen.Timers.OnDelayTimer; // timer instance
+ _testTimeDelay: LTIME := LTIME#5s; // time delay
+END_VAR
+
+// call OnDelay method somewhere in application
+// THIS must type of IAxoObject
+_testTimerOnDelay.OnDelay(THIS, _signal, _testTimeDelay);
+
+// check for output
+IF(_testTimerOnDelay.output) THEN
+
+ // handle result
+
+ENDIF;
+
+AxOpen.Timers.OffDelayTimer
+OffDelayTimer class contains OffDelay method, where logic of OffDelayTimer is implemented. OffDelay method has following input:
+VAR_INPUT
+ Parent : IAxoObject; // or IAxoContext, parent provides RTC implementation
+ inSignal : BOOL; // starts timer with falling edge, resets timer with rising edge
+ TimeDelay : LTIME; // time to pass, before output is set
+END_VAR
+
+The OffDelay method returns output, which is FALSE, TimeDelay seconds after falling edge of inSignal is detected.
+The OffDelayTimer have also public variables which can be used to access timer results:
+VAR PUBLIC
+ output : BOOL; // is FALSE, TimeDelay seconds after falling edge of inSignal is detected
+ elapsedTime : LTIME; // elapsed time
+END_VAR
+
+The LOGIC of OffDelayTimer is following:
+When inSignal is TRUE, output is TRUE and elapsedTime is 0. As soon as inSignal becomes FALSE, the time will begin to be counted in elapsedTime until its value is equal to that of TimeDelay. It will then remain constant. The output is FALSE when inSignal is FALSE and elapsedTime is equal to TimeDelay. Otherwise it is TRUE. Thus, output has a falling edge when the time indicated in TimeDelay has run out.
+Example usage of OffDelay timer:
+USING AXOpen.Timers;
+
+
+VAR
+ _signal : BOOL; // input signal, which is set somewhere in application
+ _testTimerOffDelay: AXOpen.Timers.OffDelayTimer; // timer instance
+ _testTimeDelay: LTIME := LTIME#5s; // time delay
+END_VAR
+
+// call OffDelay method somewhere in application
+// THIS must type of IAxoObject
+_testTimerOffDelay.OffDelay(THIS, _signal, _testTimeDelay);
+
+// check for output
+IF(_testTimerOffDelay.output) THEN
+
+ // handle result
+
+ENDIF;
+
+AxOpen.Timers.PulseTimer
+PulseTimer class contains Pulse method, where logic of PulseTimer is implemented. Pulse method has following input:
+VAR_INPUT
+ Parent : IAxoObject; // or IAxoContext, parent provides RTC implementation
+ inSignal : BOOL; // Trigger for start of the pulse signal
+ PulseLenght : LTIME; // the length of the pulse signal
+END_VAR
+
+The Pulse timer returns output, which is TRUE only during time counting. It creates pulses with a defined pulse duration.
+The PulseTimer have also public variables which can be used to access timer results:
+VAR PUBLIC
+ output : BOOL; // the pulse
+ elapsedTime : LTIME; // the current phase of the pulse
+END_VAR
+
+The LOGIC of PulseTimer is following:
+If inSignal is FALSE, the output is FALSE and elapsedTime is 0. As soon as inSignal becomes TRUE, output also becomes TRUE and remains TRUE for the pulse duration PulseLength. As long as output is TRUE, the time is incremented in elapsedTime, until the value reaches PT. The value then remains constant. The output remains TRUE until the pulse duration has elapsed, irrespective of the state of the input inSignal. The output therefore supplies a signal over the interval specified in PulseLength.
+Example usage of Pulse timer:
+USING AXOpen.Timers;
+
+
+VAR
+ _signal : BOOL; // input signal, which is set somewhere in application
+ _testTimerPulse: AXOpen.Timers.PulseTimer; // timer instance
+ _testPulseLength: LTIME := LTIME#5s; // pulse length
+END_VAR
+
+// call Pulse method somewhere in application
+// THIS must type of IAxoObject
+_testTimerPulse.Pulse(THIS, _signal, _testPulseLength);
+
+// check for output
+IF(_testTimerPulse.output) THEN
+
+ // handle result
+
+ENDIF;
+
+