Chapter 1: Overview
7
• Build the PLC application using click-and-drop Ladder elements and functions.
• Create a modular program, comprised of separate subroutines that can be called into the
PLC application at any time.
HMI Application
The HMI application customizes the operator interface. Use it to:
• Assign functions to the keyboard keys and enable the operator to enter data via the
controller keyboard.
• Create and display text, graphic images, and variable system data on the controller’s
screen in response to run-time conditions.
An HMI application can comprise up to 255 Displays. Each Display can include text, graphic
images, and variables.
Variables allow you to display system data on the controller’s LCD screen: bit, integer, and
timer values, times and dates, I/O status and values, and text from the variable text display
list. Variables can also use a graphic image or a bar graph to represent a value or range of
values. Up to 32 fonts may be included in a typical application. A variety of languages are
supported.
When the VisiLogic program is complete, the programmer downloads it into the controller.
The data types in the tables below can be used in your applications.
Data Type Symbol Data Type Symbol
Memory Bits (coils):
2048
MB
Timers:
192, 32 bit
T
Memory Integers (registers):
1600, 16 bit
MI
Counters:
24
C
Memory Long Integers:
256, 32 bit
ML
Inputs:
544
I
Double Word (unsigned):
64, 32 bit
DW
Outputs:
544
O
Memory Floats:
24
MF
System data types, listed below, are linked to certain values or controller functions and are
reserved for use by the system. Some of them are available for use in your program. See
“Appendix A: System Data Types,” page 33.
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