Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Uživatelský manuál stáhnout pdf (Strana 141)

100

101

Using Math Instructions

8–9

Divide (DIV)

Use the DIV instruction to divide one value (source A) by another (source B), and

place the rounded quotient in the destination. If the remainder is 0.5 or greater, the

destination is rounded up.

Updates to Arithmetic Status Bits

With this Bit: The Controller:

S:0/0 Carry (C) always resets.

S:0/1 Overflow (V)

sets if division by zero or overflow is detected; otherwise

resets. On overflow, the minor error flag is also set. The value

32,767 is placed in the destination. If S:2/14 (math overflow

selection bit) is set, then the unsigned, truncated overflow

remains in the destination.

S:0/2 Zero (Z)

sets if result is zero; otherwise resets; undefined if overflow is

set.

S:0/3 Sign (S)

sets if result is negative; otherwise resets; undefined if

overflow is set.

Changes to the Math Register

The unrounded quotient is placed in the most significant word, the remainder is

placed in the least significant word.

Programming

Execution Times

(µsec) when:

True False

147.87 6.78

DIV

DIVIDE

Source A

Source B

Dest

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 421 422

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