PLC Programming

5 - Editors in CoDeSys
'Extras' 'Connection marker'
Connections can also be represented by a connector (connection marker) instead of a connecting
line. Here the output and the associated input have a connector added to them which is given a
unique name.
Where a connection already exists between the two elements which should now be represented by
connectors, the output of the connecting line is marked and the menu point ‚Extras' ‚Connection
marker' is selected. The following diagram shows a connection before and after the selection of this
menu point.
A unique name is given as standard by the program which begins with M, but which can be changed
The connector name is stored as an output parameter, but can be edited both at the input and at the
output.
It is important to know that the connector name is associated with a property of the output of a
connection and is stored with it.
1. Edit the connector at the output:
If the text in the connector is replaced, the new connector name is adopted by all associated
connectors at the inputs. One cannot, however, select a name which already belongs to another
connection marker since the uniqueness of the connector name would be violated.
2. Edit the connector at the input:
If the text in a connector is replaced, it will also be replaced in the corresponding connection marker
on the other POU. Connections in connector representations can be converted to normal connections
in that one marks the output of the connections (Cursor position 4) and again selects the menu point
'Extras' 'Connection marker'.
Insert inputs/outputs "on the fly"
If exactly one input or output pin of an element is selected, then the corresponding input- or outputelement
can be directly inserted and its editor field filled with a string by entering the string at the
keyboard.
Order of execution
The elements block, output, jump, return and label each possess a number indicating the order in
which they are executed. In this sequential order the individual elements are evaluated at run time.
When pasting in an element the number is automatically given according to the topological sequence
(from left to right and from above to below). The new element receives the number of its topological
successor if the sequence has already been changed and all higher numbers are increased by one.
The number of an element remains constant when it is moved.
The sequence influences the result and must be changed in certain cases.
If the sequence is displayed, the corresponding sequential execution number is shown in the upper
right hand corner of the element.
'Extras' 'Order' 'Show Order'
This command switches the display of the order of execution on and off. The default setting is to show
it (recognised by a tick (ü) in front of the menu point).
The relevant order of execution number appears in the upper right hand corner for the elements block,
output, jump, return and label.
CoDeSys V2.3 5-41