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69 lines
1.8 KiB
Plaintext
69 lines
1.8 KiB
Plaintext
6 months ago
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<?xml version="1.0" encoding="utf-8"?>
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<TcPlcObject Version="1.1.0.1" ProductVersion="3.1.4024.12">
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<POU Name="SCALE_R" Id="{25a95851-a5ac-4c3a-83d0-6d0841537cfe}" SpecialFunc="None">
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<Declaration><![CDATA[FUNCTION SCALE_R : REAL
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VAR_INPUT
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X : REAL;
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I_LO : REAL;
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I_HI : REAL;
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O_LO : REAL;
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O_HI : REAL;
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END_VAR
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VAR
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END_VAR
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]]></Declaration>
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<Implementation>
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<ST><![CDATA[(*
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version 1.2 11. jan. 2011
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programmer hugo
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tested by oscat
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Scale_R is used to translate and scale a REAL input x to a real output.
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the input is limited to I_LO <= X <= I_HI.
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Type Function: REAL
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Input X: REAL (input)
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I_LO: REAL (min input value)
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I_HI: REAL (max input value)
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O_LO: REAL (min output value)
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O_HI: REAL (max output value)
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Output REAL (output value)
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SCALE_R scales an input value REAL and calculates an output value in
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REAL. The input value X is limited here to I_LO and I_HI.
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SCALE_D(IN,4,20,0,100) scales an input with 4 .. 20mA to the output 0..100.
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SCALE_R can also be negative output values and work with a negative slope, the values I_LO and I_HI but must always be specifed that ILO < I_HI.
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*)
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IF I_LO = I_HI THEN
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SCALE_R := O_LO;
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ELSE
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SCALE_R := (O_HI - O_LO) / (I_HI - I_LO) * (LIMIT(I_LO, X, I_HI) - I_LO) + O_LO;
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END_IF;
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(* revision history
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hm 18. may. 2008 rev 1.0
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original version
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hm 13. nov. 2008 rev 1.1
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corrected formula for negative gradient
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hm 11. jan 2011 rev 1.2
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avoid division by 0
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*)]]></ST>
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</Implementation>
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<LineIds Name="SCALE_R">
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<LineId Id="13" Count="6" />
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<LineId Id="38" Count="0" />
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<LineId Id="40" Count="9" />
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<LineId Id="52" Count="0" />
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<LineId Id="51" Count="0" />
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<LineId Id="20" Count="0" />
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<LineId Id="7" Count="0" />
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<LineId Id="22" Count="14" />
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<LineId Id="21" Count="0" />
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<LineId Id="37" Count="0" />
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</LineIds>
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</POU>
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</TcPlcObject>
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