PLC Programming

The Graphic Editors...
All editors for POUs consist of a declaration part and a body. These are separated by a screen
divider.
The Sequential Function Chart editor is a graphic editor. The most important commands are found in
the context menu (right mouse button or ). Tooltips show in Offline as well as in Online
mode and in the zoomed state the full names or expressions of steps, transitions, jumps, jump labels,
qualifiers or associated actions.
For information about the Sequential Function Chart see Chapter 2.2.3, 'Sequential Function Chart'.
The editor for the Sequential Function Chart must agree with the particulars of the SFC. In reference
to these, the following menu items will be of service.
Marking Blocks in the SFC
A marked block is a bunch of SFC elements that are enclosed in a dotted rectangle.
You can select an element (a step, a transition, or a jump) by pointing the mouse on this element and
pressing the left mouse button, or you can use the arrow keys. In order to mark a group of several
elements, press for a block already marked, and select the element in the lower left or right
corner of the group. The resulting selection is the smallest cohesive group of elements that includes
both of these elements.
Please regard, that a step can only be deleted together with the preceeding or the succeeding
transition !
'Insert' 'Step Transition (before)'
Symbol:
Shortcut: +
This command inserts a step in the SFC editor followed by a transition in front of the marked block.
'Insert' 'Step Transition (after)'
Symbol:
Shortcut: +
This command inserts a step in the SFC editor followed by a transition after the first transition in the
marked block.
Delete Step and Transition
A step can only be deleted together with the preceeding or the succeeding transition. For this purpose
put a selection frame around step and transition and choose command 'Edit' 'Delete' or press the
key.
'Insert' 'Alternative Branch (right)'
Symbol:
Shortcut: +
This command inserts an alternative branch in the SFC editor as a right branch of the marked block.
For this the marked block must both begin and end with a transition. The new branch is then made up
of one transition.
'Insert' 'Alternative Branch (left)'
Symbol:
This command inserts an alternative branch in the SFC editor as the left branch of the marked block.
For this the marked block must both begin and end with a transition. The new branch is then made up
of one transition.
5-30 CoDeSys V2.3