Kuhnke Electronics Instruction Manual

4.7 Programming Using CoDeSys
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Programming
The sections below explain some basic details you need
to know to use CoDeSys for writing your user programs.
4.7.1 Variables/Addresses
All memory cells that can be addressed by the user
program for signal processing or data storage are referred
to as variables. There are two basic types of variables:
� Variables with a set address:
These variables are inputs, outputs or internal
memory cells of the control unit which can be directly
accessed by the user program.
� External PROFIBUS operands:
These variables are either declared locally in a
module's declaration section, or globally in the list of
global variables. CoDeSys defines the address in the
controller when the variables are "interpreted".