Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 738)

L-force | PLC Designer
General Editors
736 DMS 4.1 EN 03/2011 TD29
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Symbol Element name / Example Description
Examples of transition
Abb. 406 Transition or
property object
indicated by a
triangle:
or
- a valid conditional expression."
Regard that transitions which consist of a
transition or a property object are indicated by a
small triangle in the upper right corner of the
rectangle.
A transition condition must have the value TRUE
or FALSE. Thus it can consist of either a boolean
variable, a boolean address, a boolean constant,
or a series of instructions having a boolean result.
But a transition may not contain programs,
function blocks or assignments!
In contrast to »PLC Designer« V2.3...
... a transition condition is handled like a method
call; It be entered according to the
Syntax:
:=;
(for example" trans1:= a=100")
or just
;
(for example "a=100")
See also t1in the left column.
In online mode the subsequent step can only get
active if the preceding transition has become
TRUE.
Action
Abb. 407 Actions in POUs tree
An action can contain a series of instructions
written in one of the valid programming
languages. It is assigned to a step and in online
mode it will be processed according to the
defined sequence of processing.
Each action to be used in SFC steps must be
available as a valid POU within the SFC POU resp.
the project ( ).
The 'Add Object' command is available for adding
an action POU below a SFC POU.
Note: Step names must be unique in the scope
of the parent POU. An action may not contain a
step having the same name like the step to
which it is assigned to.