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Math

Rounding and Truncation​

ABS​

The ABS function returns the absolute value of a number.

VAR
  result: REAL;
END_VAR
result := ABS(-5.3);  // result is 5.3

CEIL​

The CEIL function returns the smallest integer greater than or equal to a number.

VAR
  result: REAL;
END_VAR
result := CEIL(5.3);  // result is 6.0

FLOOR​

The FLOOR function returns the largest integer less than or equal to a number.

VAR
  result: REAL;
END_VAR
result := FLOOR(5.7);  // result is 5.0

TRUNC​

The TRUNC function returns the integer part of a number, effectively truncating the decimal part.

VAR
  result: REAL;
END_VAR
result := TRUNC(5.7);  // result is 5.0

Trigonometry​

SIN​

The SIN function returns the sine of an angle (in radians).

VAR
  result: REAL;
END_VAR
result := SIN(3.14 / 2);  // result is approximately 1.0

COS​

The COS function returns the cosine of an angle (in radians).

VAR
  result: REAL;
END_VAR
result := COS(3.14);  // result is approximately -1.0

TAN​

The TAN function returns the tangent of an angle (in radians).

VAR
  result: REAL;
END_VAR
result := TAN(3.14 / 4);  // result is approximately 1.0

ACOS​

The ACOS function returns the arc cosine of a number.

VAR
  result: REAL;
END_VAR
result := ACOS(1.0);  // result is 0.0 (in radians)

ASIN​

The ASIN function returns the arc sine of a number.

VAR
  result: REAL;
END_VAR
result := ASIN(1.0);  // result is 1.57 (in radians)

ATAN​

The ATAN function returns the arc tangent of a number.

VAR
  result: REAL;
END_VAR
result := ATAN(1.0);  // result is 0.785 (in radians)

Exponential and Logarithmic​

EXPT​

The EXPT function returns the value of a number raised to the power of another number.

VAR
  result: REAL;
END_VAR
result := EXPT(2.0, 3.0);  // result is 8.0

EXP​

The EXP function returns the value of e raised to the power of a number.

VAR
  result: REAL;
END_VAR
result := EXP(1.0);  // result is approximately 2.718

LN​

The LN function returns the natural logarithm of a number.

VAR
  result: REAL;
END_VAR
result := LN(2.718);  // result is approximately 1.0

LOG​

The LOG function returns the base-10 logarithm of a number.

VAR
  result: REAL;
END_VAR
result := LOG(100.0);  // result is 2.0

SQRT​

The SQRT function returns the square root of a number.

VAR
  result: REAL;
END_VAR
result := SQRT(9.0);  // result is 3.0