Statement List (STL) - DCE FEL ČVUT v Praze

8 Floating-Point Math Instructions
8.1 Overview of Floating-Point Math Instructions
Description
The math instructions combine the contents of accumulators 1 and 2. In the case of
CPUs with two accumulators, the contents of accumulator 2 remains unchanged.
In the case of CPUs with four accumulators, the contents of accumulator 3 is copied
into accumulator 2 and the contents of accumulator 4 into accumulator 3. The old
contents of accumulator 4 remains unchanged.
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:
• +R Add ACCU 1 and ACCU
• -R Subtract ACCU 1 from ACCU 2
• *R Multiply ACCU 1 and ACCU 2
• /R Divide ACCU 2 by ACCU 1
Using floating-point math, you can carry out the following operations with one 32-bit
IEEE floating-point number:
• ABS Absolute Value
• SQR Generate the Square
• SQRT Generate the Square Root
• EXP Generate the Exponential Value
• LN Generate the Natural Logarithm
• SIN Generate the Sine of Angles
• COS Generate the Cosine of Angles
• TAN Generate the Tangent of Angles
• ASIN Generate the Arc Sine
• ACOS Generate the Arc Cosine
• ATAN Generate the Arc Tangent
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 8-1