Siemens Simatic S7-300 Service Manual download pdf (Page 100)

Integer Math Instructions

Statement List (STL) for S7-300 and S7-400 Programming

7-6

A5E00706960-01

7.6 /I Divide ACCU 2 by ACCU 1 as Integer (16-Bit)

Format

Description

(divide 16-bit integer numbers) divides the contents of ACCU 2-L by the contents of

ACCU 1-L. The contents of ACCU 1-L and ACCU 2-L are interpreted as 16-bit

integer numbers. The result is stored in accumulator 1 and consists of two 16-bit

integer numbers, the quotient, and the remainder. The quotient is stored in ACCU

1-L and the remainder in ACCU 1-H. The instruction is executed without regard to,

and without affecting, the RLO. The status word 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.

See also Evaluating the Bits of the Status Word with Integer Math Instructions.

Status word

BR CC 1 CC 0 OV OS OR STA RLO /FC

writes: - x x x x - - - -

Status bit generation CC 1 CC 0 OV OS

Quotient = 0 0 0 0 -

-32768 <= Quotient < 0 0 1 0 -

32767 >= Quotient > 0 1 0 0 -

Quotient = 32768 1 0 1 1

Division by zero 1 1 1 1

Example

STL Explanation

L IW10 //Load the value of IW10 into ACCU 1-L.

L MW14 //Load the contents of ACCU 1-L into ACCU 2-L. Load the value of MW14 into

ACCU 1-L.

/I //Divide ACCU 2-L by ACCU 1-L; store the result in ACCU 1: ACCU 1-L:

quotient, ACCU 1-H: remainder

T MD20 //The contents of ACCU 1 (result) are transferred to MD20.

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 271 272

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