Statement List (STL) - DCE FEL ČVUT v Praze

8.3 Floating-Point Math Instructions: Basic
Floating-Point Math Instructions
8.3.1 +R Add ACCU 1 and ACCU 2 as a Floating-Point Number (32-Bit
IEEE-FP)
Format
+R
Description of instruction
Result
+R (add 32-bit IEEE floating-point numbers) adds the contents of accumulator 1 to
the contents of accumulator 2 and stores the result in accumulator 1. The contents of
accumulator 1 and accumulator 2 are interpreted as 32-bit IEEE floating-point
numbers. The instruction is executed without regard to, and without affecting, the
RLO. The status bits CC 1, CC 0, OS, and OV are set as a function of the result of
the instruction.
The contents of accumulator 2 remain unchanged for CPUs with two ACCUs.
The contents of accumulator 3 are copied into accumulator 2, and the contents of
accumulator 4 are copied into accumulator 3 for CPUs with four ACCUs. The
contents of accumulator 4 remain unchanged.
The result in ACCU 1 is CC 1 CC 0 OV OS Note
+qNaN 1 1 1 1
+infinite 1 0 1 1 Overflow
+normalized 1 0 0 -
+denormalized 0 0 1 1 Underflow
+zero 0 0 0 -
-zero 0 0 0 -
-denormalized 0 0 1 1 Underflow
-normalized 0 1 0 -
-infinite 0 1 1 1 Overflow
-qNaN 1 1 1 1
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 8-3