Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 175)

Chapter 10
Using Math Instructions
10–9
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.
Source A and B can either be a word address or a constant; however, both
sources cannot be a constant. The destination must be a word address.
Updates to Arithmetic Status Bits
With this Bit: The Controller:
S0/0 Carry (C) always resets.
S0/1 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 S2/14 (math
overflow selection bit) is set, then the unsigned, truncated
overflow remains in the destination.
S0/2 Zero (Z)
sets if result is zero; otherwise resets; undefined if overflow
is set.
S0/3 Sign (S)
sets if result is negative; otherwise resets; undefined if
overflow is set.
Entering the Instruction
You enter the instruction from within the program monitor functional area.
P 0 0 0 D I V S R C A
1 0 0
P 0 0 0 D I V S R C B
T 0 0 . P R E 1 0 0
P 0 0 0 D I V D E S T
C 0 1 . P R E 1 2 0
Changes to the Math Register
The unrounded quotient is placed in the most significant word; the remainder
is placed in the least significant word.
DIV
DIVIDE
Source A
100
Source B T4:0.PRE
100
Dest C5:1.PRE
120
Execution Times (
µ
sec) when:
True False
147.87 6.78
Ladder representation:
Divide (DIV)
3
U
8
FUN ENT
To enter the function code, press: