Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 114)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

6–16

Entering Parameters

Accumulator

alue (ACC)

This is the number of false-to-true transitions that have occurred since the counter

was last reset.

Preset

alue (PRE)

Specifies the value which the counter must reach before the controller sets the done

bit. When the accumulator value becomes equal to or greater than the preset value,

the done status bit is set. Y

ou can use this bit to control an output device.

Preset and accumulated values for counters range from –32,768 to +32,767, and are

stored as signed integers. Negative values are stored in two’

s complement form.

Addressing Structure

Address bits and words using the format Cf:e.s/b

Format Explanation

C Counter file

f File number. The only valid file number is 5.

: Element delimiter

Cf:e

Element

number

Ranges from 0 – 39. These are 3-word elements. See figure

on page 6–15.

Cf:e

Word

element

s subelement

/ Delimiter

b bit

Note If

assigned to a high-speed counter instruction, C5:0 is not available as an addr

ess

for any other counter instructions. For mor

e information on high-speed counter

instructions, see chapter 12.

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 421 422

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