Lenze DDS v2.3 Uživatelský manuál stáhnout pdf (Strana 49)

Drive PLC Developer Studio

Programming languages

4-11

l DDS EN 2.3

4.4 Sequential Function Chart (SFC)

Sequential Function Chart is a graphically oriented language that enables the user to describe the

chronological sequence of different actions within a program.

Example of a network in SFC

4.4.1 Step

An organization unit written in SFC consists of a sequence of steps that are interconnected through

transitions.

There are two different step types:

• The simplified step consist of an action and a flag to indicate whether the step is active or

not. A small triangle appears in the top right-hand corner of the step to indicate that the

action for a step has been implemented.

• An IEC step consists of a flag and one or more assigned actions or Boolean variables. The

associated actions appear to the right of the step.

4.4.2 Action

An action may contain a sequence of instructions in IL, CFC or ST, a number of networks in FBD or

LD or another sequence structure (SFC).

• Simplified steps always have an action linked to the step.

• Actions can be edited by double-clicking the step linked to the action or selecting the step

before executing menu command Extras➞

➞➞

➞Zoom action/transition. Furthermore, the

configuration allows one entry and / or one exit action per step.

• In the

Object Organizer

, actions of IEC steps are grouped directly underneath their SFC

organization unit and can be loaded into the editor with a double-click or pressing the

<Enter> key. New actions can be generated with Project➞

➞➞

➞Add action.

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Lenze DDS v2.3 Uživatelský manuál Strana 49