Simatic Pcs7 v6.1 Step7-Lad Programming For s7-300 And 400 Reference Manual

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Description
The IEEE 32-bit floating-point numbers belong to the data type called REAL.
You can use the floating-point math instructions to perform the following math
instructions using two 32-bit IEEE floating-point numbers:
• ADD_R Add Real
• SUB_R Subtract Real
• MUL_R Multiply Real
• DIV_R Divide Real
Using floating-point math, you can carry out the following operations with one
32-bit IEEE floating-point number:
• Establish the Absolute Value (ABS)
• Establish the Square (SQR) and the Square Root (SQRT)
• Establish the Natural Logarithm (LN)
• Establish the Exponential Value (EXP) to base e (= 2,71828)
• Establish the following trigonometrical functions of an angle represented as a
32-bit IEEE floating-point number
- Sine (SIN) and Arc Sine (ASIN)
- Cosine (COS) and Arc Cosine (ACOS)
- Tangent (TAN) and Arc Tangent (ATAN)
See also Evaluating the Bits of the Status Word.