PLC Programming

The Graphic Editors...
Network
Even with the object zoomed, cursor positions in the editors can be further selected and even reached
with the arrow keys. Text size is governed by the zoom factor and the font size that is set.
The execution of all editor menu features (e.g. inserting a box) as a function of cursor position is
available at all zoom levels, taking the same into account.
In Online mode, each object is displayed according to the zoom level that has been set; Online
functionality is available without restriction.
When the IntelliMouse is used, an object can be enlarged/reduced by pressing the key and
at the same time turning the wheel forward or backwards.
In the LD and FBD editors, the program is arranged in a list of networks. Each network is designated
on the left side by a serial network number and has a structure consisting of either a logical or an
arithmetic expression, a program, function or function block call, and a jump or a return instruction.
Label
Each network has a label that can optionally be left empty. This label is edited by clicking the first line
of the network, directly next to the network number. Now you can enter a label, followed by a colon.
Network Comments, Networks with Linebreaks, 'Extras' 'Options'
Every network can be supplied with a multi-lined comment. In the dialog 'Function Block and Ladder
Diagram Options', which can be opened by executing the command 'Extras' 'Options', you can do the
settings concerning comments and linebreaks:
In the maximum comment size field you can enter the maximum number of lines to be made
available for a network comment (The default value here is 4.) In the field minimum comment size
you can enter the number of lines that generally should be reserved for . If, for example, the number 2
is entered, then, at the start of each network there will be two empty lines after the label line. The
default value here is 0, which has the advantage of allowing more networks to fit in the screen area.
If the minimal comment size is greater than 0, then in order to enter a comment you simply click in the
comment line and then enter the comment. Otherwise you first must select the network to which a
comment is to be entered, and use 'Insert' 'Comment' to insert a comment line. In contrast to the
program text, comments are displayed in grey.
In the Ladder editor you can also assign an individual comment to each contact or coil. For this
activate the option Comments per Contact and insert in the edit field Lines for variable comment
the number of lines which should be reserved and displayed for the comment. If this setting is done, a
comment field will be displayed in the editor above each contact and coil where you can insert text.
If the option Comments per Contact is activated, then in the Ladder editor also the number of lines
(Lines for variable text :) can be defined which should be used for the variable name of the contact
resp. coil. This is used to display even long names completely by breaking them into several lines.
In the Ladder editor it is possible to force linebreaks in the networks as soon as the network length
would exceed the given window size and some of the elements would not be visible. For this activate
the option Networks with Linebreaks.
'Insert' 'Network (after)' or 'Insert' 'Network (before)'
Shortcut: + (Network after)
In order to insert a new network in the FBD or the LD editor, select the 'Insert' 'Network (after)' or
the 'Insert' 'Network (before)' command, depending on whether you want to insert the new network
before or after the present network. The present network can be changed by clicking the network
number. You will recognize it in the dotted rectangle under the number. With the and a
mouse click you can select from the entire area of networks, from the present one to the one clicked.
The network editors in the online mode
In the FBD and the LD editors you can only set breakpoints for networks. The network number field of
a network for which a breakpoint has been set, is displayed in blue. The processing then stops in front
5-18 CoDeSys V2.3