Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 55)

Fundamental Instruction Set

Chapter 5

518

Figure 5.10

Arithmetic

Instructions

111

030

520

032

1014

031

514

G +

Must be true to allow arithmetic operation

Result stored at this address

Overflow (bit 14) will cause

a 1 to be displayed

Add

111

040

100

042

-009

041

109

G -

Must be true to allow arithmetic operation

Result stored at this address

Underflow (bit 16) will cause

negative sign to be displayed

Subtract

111

130

123

052

503

131

061

G X

Must be true to allow arithmetic operation

051

007

Multiply

111

140

050

067

000

141

025

G :

Must be true to allow arithmetic operation

066

002

Divide

NOTE: The controller performs arithmetic and data manipulation operations

with 3-digit BCD (binary coded decimal) values.

Addition

Symbol: -(+)-

Purpose: Reports the sum of two values stored in the get instruction words.

Syntax: Programmed in the output position of the ladder diagram rung. Your

sum is stored in the add instruction word address.

Function: When the sum exceeds 999, the overflow bit (bit 14) in the add

instruction word is set. When you are in the run, test, or run program mode, the

overflow condition is displayed on the industrial terminal screen as a “1”

preceding the sum.

NOTE: If an overflow value (4 digits) is used for subsequent comparisons or

other arithmetic operations, inaccurate results could occur. Your processor

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 55

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