Rockwell Automation AutoMax Enhanced Ladder Editor User Manual
Page 65
5Ć19
Tip
Selecting a variable from the Set Variables List fills the parameters
within the Current Selection group box with the information for the
variable.
5.12.2
Forcing Variables
To force a variable is to write a value to it that cannot be overĆwritten
by another program referencing the same variable. You can force
any simple global variable in the configuration or any simple local
variable present in a task that is loaded into the processor. Only
unforcing a variable permits it to be changed by a program or an
external device.
I
MPORTANT
You can force only simple variables. You cannot force
elementĆindexed or bitĆindexed variables. For example, you cannot
force variables like: vat.13, array_var[11], array_var[index_name],
array_var[11].12, or array_var[index_name].bit_name.
To force a variable
Step 1.
Make sure an online program window is open.
Step 2.
Do one of the following:
D Click on
or
D From the Online menu, choose Set/Force/Unforce.
The Set/Force/Unforce Variables dialog box is displayed.
You should keep this dialog box open while you are
setting, forcing, or unforcing multiple variables.
Step 3.
If you want to force a local variable, enter the name of the
program in which the variable is used in the Program
field. If you want to force a global variable, leave the field
blank.
Step 4.
Enter the name of the variable to be forced.
Only simple variables can be forced. The simple variable
selected before choosing the Set/Force/Unforce
command is the default. If no variable was selected, the
last variable forced is the default.
Step 5.
In the Value/State field, enter the value or state to force.
For Booleans, enter true, false, T, F, on, off, 1, or 0. You
can enter either decimal or hexadecimal values for
nonĆBoolean variables.
Step 6.
Select the force page (1Ć4) on which to store the variable
using the arrows in the Force Page field.
Specifying the force page lets you control how forced
variables are grouped. Variables grouped on one force
page can be unforced at the same time.
Step 7.
Click Force to force the variable.
Forced variables change to the color you specified on the Colors
tab. The default color for forced variables is red.