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ONDELAYTIMER.md

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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;