Omron CX-PROGRAMMER V9 Operation Manual page 96

OMRON
The following items are standard features of the Ladder program area:
♦ Cursor. A rectangular block showing the current position within the rung. The location of the cursor is
displayed in the status bar.
♦ Rung. A logical unit of a ladder program. A rung can encompass one or more rows and columns. All rungs
are numbered.
♦ Bus-bars. The left bus-bar provides a graphical representation of the power supply bus-bar. The right bus-
bar contains the output region: to align objects to the right bus-bar. The right bus-bar is selectable for
display. If shown, the ladder rungs are justified so that the outputs of the rungs are organized along it.
♦ Grid Dots. Dots that display at the connection points of each cell. To display the grid, select the Grid
button from the toolbar.
♦ Rung Margin Area. The area to the left of the Left bus-bar. The rung number and step number for each rung
are shown here (rung number on the left).
♦ Automatic Error Detection. A bar is displayed to the left of the currently selected rung area. As elements
and instructions are added to the rung, the additions are automatically checked to see if they are valid. The
color of the bar indicates the validity of the program: red highlights an error, whilst green indicates a correct
entry. In addition, elements of the text on the ladder are drawn in this error color if a problem exists.
The color and display preferences of the above features can be amended by selecting Options from the Tools
menu.
More than one element in a rung can be selected by pressing the mouse button down on an element and, keeping
the left-mouse button depressed, dragging a highlight over other elements in the rung. Selected elements can
then be moved as a block.
The global/local, name, address/value, and I/O comment fields for the symbol at the cursor position can be
displayed in the symbol bar below the Ladder Section window (CX-Programmer Ver. 4.0 or later). Enable this
function by selecting Show symbol bar in the Diagrams Tab in the Options Dialog Box of the Tools Menu (the
default setting is ON: display). Therefore, while increasing the program display density, the text in particularly
long I/O comments can be checked, thereby improving the readability of the program.
Mnemonics View
The Mnemonics view is a formatted editor for programming in mnemonic instructions. This view is made up of
a table of six columns containing the rung number, step number, instruction, operands, value and comment.
Mnemonic instructions are a 'low-level' view of a PLC program, whilst ladder is higher. Since the ladder
program is just a higher-level representation of the mnemonic instructions, it is possible to type in mnemonics
and see the ladder program update.
PART 1: CX-Programmer
CHAPTER 2 – Quick Start Guide
CX-Programmer _Page 13