Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 741)

L-force | PLC Designer
General Editors

DMS 4.1 EN 03/2011 TD29 739
Symbol Element name / Example Description
Parallel branch
A parallel branch must begin and end with a
step. Parallel branches can contain alternative
branches or other parallel branches.
The horizontal lines before and after the
branched area are double-lines.
Processing in online mode: If the preceding
transition (t2 in the example shown on the left) is
TRUE, the first steps of all parallel branches will
become active (Step11 and Step21). The
particular branches will be processed parallel to
one another before the subsequent transition (t3)
will be noticeed.
A parallel branch is inserted via command 'Insert
branch (right)' when a step is currently selected.
Notice that parallel and alternative branches can
be transformed to each other by the commands
Parallel resp. Alternative. This might be useful
during programming.
Automatically a branch label is added at the
horizontal line preceding the branching which is
named "Branch<n> whereby n is a running
number starting with "0". This label can be
specified when defining a jump target.
Alternative branch
An alternative branch must begin and end with a
transition. Alternative branches can contain
parallel branches and other alternative branches.
The horizontal lines before and after the
branched area are simple lines.
If the step which precedes the alternative
beginning line is active, then the first transition
of each alternative branch will be evaluated from
left to right. The first transition from the left
whose transition condition has value TRUE, will
be opened and the following steps will be
activated.
Alternative branches are inserted via command
'Insert branch (right)' when a transition is
currently selected.
The horizontal lines before and after the
branched area are simple lines.
Notice that parallel and alternative branches can
be transformed to each other by the commands
Parallel resp. Alternative. This might be useful
during programming.