Statement List (STL) - DCE FEL ČVUT v Praze

Integer Math Instructions
7.2 Evaluating the Bits of the Status Word with Integer Math
Instructions
Description
The integer math instructions influence the following bits in the Status word: CC1
and CC0, OV and OS.
The following tables show the signal state of the bits in the status word for the results
of instructions with Integers (16 and 32 bits):
Valid Range for the Result CC 1 CC 0 OV OS
0 (zero) 0 0 0 *
16 bits: -32 768 0 (positive number)
32 bits: 2 147 483 647 >= result > 0 (positive number)
1 0 0 *
* The OS bit is not affected by the result of the instruction.
Invalid Range for the Result A1 A0 OV OS
Underflow (addition)
16 bits: result = -65536
32 bits: result = -4 294 967 296
0 0 1 1
Underflow (multiplication)
16 bits: result < -32 768 (negative number)
32 bits: result < -2 147 483 648 (negative number)
0 1 1 1
Overflow (addition, subtraction)
16 bits: result > 32 767 (positive number)
32 bits: result > 2 147 483 647 (positive number)
0 1 1 1
Overflow (multiplication, division)
16 bits: result > 32 767 (positive number)
32 bits: result > 2 147 483 647 (positive number)
1 0 1 1
Underflow (addition, subtraction)
16 bits: result < -32. 768 (negative number)
32 bits: result < -2 147 483 648 (negative number)
1 0 1 1
Division by 0 1 1 1 1
Operation A1 A0 OV OS
+D: result = -4 294 967 296 0 0 1 1
/D or MOD: division by 0 1 1 1 1
Statement List (STL) for S7-300 and S7-400 Programming
7-2 A5E00706960-01