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sngX1 := UINT_TO_REAL (uintX1);
sngX2 := UINT_TO_REAL (uintX2);
sngY1 := UINT_TO_REAL (uintY1);
sngY2 := UINT_TO_REAL (uintY2);
sngX := UINT_TO_REAL (uintX)*EXPT (10.0, uintDecPtDiff);

IF sngX <= sngX1 THEN
    uintY := REAL_TO_UINT (sngY1);
ELSIF sngX >= sngX2 THEN
    uintY := REAL_TO_UINT (sngY2);
ELSE
    uintY := REAL_TO_UINT (sngY1+(sngY2-sngY1)/(sngX2-sngX1)*(sngX-sngX1));
END_IF;

我沒(méi)用過(guò)歐姆龍的，不過(guò)這個(gè)看起來(lái)也不難理解吧。
sngX1 := UINT_TO_REAL (uintX1);這個(gè)是數(shù)據(jù)類型轉(zhuǎn)換，整型轉(zhuǎn)換成浮點(diǎn)型，
IF sngX <= sngX1 THEN
    uintY := REAL_TO_UINT (sngY1);
ELSIF sngX >= sngX2 THEN
    uintY := REAL_TO_UINT (sngY2);
比較，轉(zhuǎn)換，賦值。
ELSE
    uintY := REAL_TO_UINT (sngY1+(sngY2-sngY1)/(sngX2-sngX1)*(sngX-sngX1));
END_IF;
計(jì)算，賦值。