Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 100)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

6–2

Timer/Counter Instructions

Instruction

Purpose

Page

Mnemonic Name

Purpose

Page

TON Timer On-Delay Counts timebase intervals when the instruction is

true.

6–11

TOF Timer Off-Delay Counts timebase intervals when the instruction is

false.

6–12

RTO Retentive Timer Counts timebase intervals when the instruction is

true and retains the accumulated value when the

instruction goes false or when power cycle occurs.

6–14

CTU Count Up Increments the accumulated value at each false-to-

true transition and retains the accumulated value

when the instruction goes false or when power cycle

occurs.

6–18

CTD Count Down Decrements the accumulate value at each false-to-

true transition and retains the accumulated value

when the instruction goes false or when power cycle

occurs.

6–19

RES Reset Resets the accumulated value and status bits of a

timer or counter. Do not use with TOF timers.

6–20

About the Basic Instructions

These instructions, when used in ladder programs represent hardwired logic circuits

used for the control of a machine or equipment.

The basic instructions are separated into three groups: bit, timer, and counter.

Before you learn about the instructions in each of these groups, we suggest that you

read the overview that precedes the group:

• Bit Instructions Overview

• Timer Instructions Overview

• Counter Instructions Overview

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 421 422

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