70
Adding a section
1.
Right-click
Program0
under
Programming - POUs - Programs
in the Multiview
Explorer. Select
Add - Section
from the menu.
2.
A section with the name
Section1
is added under
Program0
.
3-8-5
Types of Variables
Global variables
Global variables are variables registered in the I/O Map and used for more than one
program. They can be accessed from any program.
External variables and internal variables
External variables and internal variables are used only within one program.
When global variables (
SW1
and
L1
) are used in programs, the global variables are
registered as external variables. Variables that are registered in programs (
Timer1
and
Timer1PV
) are registered as internal variables.