27 lines
587 B
Plaintext
27 lines
587 B
Plaintext
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#Faster response than SMA, no large buffer needed. The alpha parameter (0.0–1.0) controls smoothing — lower = more smoothing.
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FUNCTION_BLOCK FB_EMA
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VAR_INPUT
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xEnable : BOOL;
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rInput : REAL;
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rAlpha : REAL := 0.1; // Smoothing factor: 0 = max smooth, 1 = no filter
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END_VAR
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VAR_OUTPUT
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rOutput : REAL;
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END_VAR
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VAR
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xFirst : BOOL := TRUE;
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END_VAR
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IF NOT xEnable THEN
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xFirst := TRUE;
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rOutput := rInput;
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RETURN;
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END_IF;
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IF xFirst THEN
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rOutput := rInput;
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xFirst := FALSE;
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ELSE
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rOutput := rAlpha * rInput + (1.0 - rAlpha) * rOutput;
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END_IF;
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