PLC Programming

The Graphic Editors...
'Extras' 'Order' 'Order topologically'
Elements are ordered in a topological sequence when the execution takes place from left to right and
from above to below, that is the number increases from left to right and from above to below for
topologically arranged elements. The connections are not relevant, only the location of the elements is
important.
All selected elements are topologically arranged when the command 'Extras' 'Order' 'Order
topologically' is executed. All elements in the selection are taken out of the sequential processing list
by this process. The elements are then entered into the remaining sequential processing list
individually from bottom right through to upper left. Each marked element is entered into the
sequential processing list before its topological successor, i.e. it is inserted before the element that in
a topological sequencing would be executed after it, when all elements in the editor were sequenced
according to a topological sequencing system. This will be clarified by an example.
The elements with numbers 1, 2 and 3 are selected. If the command 'Order topologically' is selected
the elements are first taken out of the sequential processing list. Var3, the jump and the AND-operator
are then inserted again one after the other. Var3 is placed before the label and receives the number 2.
The jump is then ordered and receives the number 4 at first but this then becomes 5 after the AND is
inserted. The new order of execution which arises is:
When a newly generated block is introduced it will be placed by default in front of its topological
successor in the sequential processing list.
'Extras' 'Order' 'One up'
With this command all selected elements with the exception of the element which is at the beginning
of the sequential processing list are moved one place forwards in the sequential processing list.
5-42 CoDeSys V2.3