Programming Actions and Conditions
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
7-29
Displaying Symbol Information when Entering Addresses
You can simplify the entry of symbolic addresses in LAD and FBD by displaying
existing symbols in a drop-down list box. If the menu command View > Display
with > Symbol List is selected, the list box with the symbols is displayed
automatically when you enter addresses. If the menu command is not selected,
you can open the list box with the symbols at any time using the right mouse button
and the Insert Symbol command.
Example of Using Symbolic Names
•
Instead of the address I 0.1, use the defined name “Dr_mot_stopped" or
•
Instead of the absolute block identifier FB11, use the symbolic name “Seq_drill".
7.13 Editing Variables
You can edit variables in the variable declaration window in S7-Graph. The variable
declaration window is displayed to the left of the work area.
In the left half of the variable declaration window, you will see the declaration
sections and on the right-hand side the detailed information of the component
selected on the left. Since the right-hand side is not often required it is normally
masked by the work area.
You can modify existing parameter sets in the variable declaration window. You
can delete, but not edit system parameters. You can also define your own
parameters and variables.
With the F1 key, detailed help is available on declaring variables in the variable
declaration window.
Inserting Parameters in the Sequencer
If you want to use a parameter or variable in the sequencer, you can drag the
parameter or variable from the variable declaration window to the sequencer using
the mouse and position it at the required location.
Automatic Updating of Changes
Changes you have made to the parameters or variables in the variable declaration
window are automatically updated in the sequencer so that no inconsistencies can
result.
