Emerson iPro SERIES Manual do Utilizador descarregar pdf (Página 37)

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1592025400 – Vers. 1.0 - 37 -

7. THE ISAGRAF WORKBENCH

7.1 Definitions

Before to start with the examples is important to fix some important definitions.

Resource: it is your project; inside there are the elements of your project.

The elements of your project are:

Programs: it is the software that you develop to execute your application.

In this picture, for every PLC Cycle, iPRO executes

the programs: Read_Inputs Æ Regulator_status_of_controller

Æ Regulator _Fans Æ ……

The number and the order of the programs depend on

your software.

PLC Cycle: it is the time that synchronize the execution of

the programs. For every PLC cycle, iPRO executes

the list of the program.

It is important to define this value considering that the CT must be:

• NEVER = 0ms (zero ms)

• ALWAYS compare the Current Cycle Time (CCT) and the Programmed

Cycle Time (PCT) with the following rule:

PCT > (2 x CCT)

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Emerson iPro SERIES Manual do Utilizador Página 37