Rockwell-automation 1747-PTxx Getting Started Guide for HHT Uživatelský manuál stáhnout pdf (Strana 25)

Chapter 2

Control Basics

2–8

Processor Operating Cycle

The diagram below indicates the events that occur during the processor

operating cycle. This sequence is repeated many times each second.

Input Data File

address data

I:1 0001

( )

O:3.0

] [

I:1.0

]/[

I:1.0

Output Data File

address data

O:3 0000 0001

The status of external input circuits is

read. The input data file is updated with

this information.

The ladder program is executed. The

input data file is evaluated, the ladder

rung is solved, and the output data file

is updated.

The output data file information is

transferred to the external output circuit,

thus energizing or de–energizing it.

Communications with the HHT and other

network devices takes place.

Processor internal housekeeping takes place.

Input

Scan

Program Scan

Output Scan

Communications

Housekeeping

Event Description

Illuminated

activated

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 76 77

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Rockwell-automation 1747-PTxx Getting Started Guide for HHT Uživatelský manuál Strana 25