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In the world of parameter logic controllers
or PLCs, variables are a critical component
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of any program. They allow for storage and manipulation
of data and are essential for creating complex
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programs that can perform a variety of tasks. In this video we will
take a closer look at variables in the LS Electric XGB PLC memory
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and discuss their scope or the area of
the program in which they can be accessed
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What are variables? Before diving into the specifics
of the LS Electric XGB PLC variables, let's briefly
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discuss what the variables are. Variables are essentially
placeholders for data that is used within your program
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They can store various data types including
integers, floating point numbers, strings, etc
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Variables can be manipulated using various programming constructs,
such as mathematical operations, string, or comparisons
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Typically variables are declared before you
start to program the PLC, but they can be
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declared any time. Let's get started. Detailed information
contained in this video can be found at accautomation.ca, a link has
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been put in the description below. If you have not watched the
other videos yet, there will be links in the description below
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that will start you with video 1. There will be
links to the rest of the videos in the series as well
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XGB Memory The LS Electric XGB PLC
memory is backed up by non-vital RAM
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Variables like the Real Time Clock or RTC can
maintain its settings for 6 months without
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a battery. PLC Memory Mapping The PLC memory
can be defined in three major sections
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Memory Area for User Programming The programmer controls
this area for any use in the application programming
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Memory Area for PLC I.O. This area is
designated for the physical I.O. of the PLC
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Memory Area for the PLC Flag Registers This area is
updated by the PLC to show the current system status
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You can reference these registers in the programming. The
total XGB memory can be summarized in the following table
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This can be shown in the
following block diagram of the XGB
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The PLC has 384 kilobytes for your program
and parameter area. XGB Memory Retentive Areas
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The following table shows the XGB PLC's memory retentive areas. Memory
retention is used when you want to start and stop the PLC without losing a bit
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or word status. Initialization of Data According to Restart
Mode There are three variables related to restart mode
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Default, Initialization, and Retain variable. The initialization method
for each variable in case of executing restart mode is as follows
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Operation of Data Retain Area The method
of deleting the retain area is as follows
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Reset through the XG5000, which is the overall reset.
Execute clear memory through XG5000 at stop mode
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Writing by program, initialization program recommended.
Writing zero, fill, etc. at XG5000 monitor mode
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Refer to the following table for holding retain
data area or reset clear operation according
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to the PLC operation. Initialization of Data If the PLC becomes
clear memory status, the memory of all devices is deleted as zero
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When you want to specify the initial value,
use the initialization task at the CPU module
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There are two types of built-in memory. One is program memory to
save programs made by the user for the user to construct the system
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Another is the data memory device area saving data during
operation. Indirect Addressing or Pointers in the XGB
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Indirect addressing or pointers can
be done in the XGB PLC using arrays
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We will be discussing this in future posts.
Variable Scope in the LS Electric XGB PLC
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In the XGB PLC, variables are used extensively throughout the program. They can
be declared using various data types including integers, floating point numbers
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and strings. One important concept to understand when
working with the LS Electric XGB PLC variables is scope
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Scope refers to the area of the program
in which the variable can be accessed
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Variables can be either local or global in scope. System Variables The
scope of variables is easier to see in the project navigation window
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System variables can be seen by any item
in this window. Global Direct Variable
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Global variables can be used by anything
under the device. In this case, the LS PLC
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The variables cannot be seen outside of this area. Local Variables
Local variables can only be accessed with a specific scope
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In this case, the program for the EZ Transfer
line can only access these variables
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Variables are a critical component of any
PLC program and the LS Electric XGB PLC is
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no exception. Understanding the basics of variable
declaration and scope allows you to create more complex
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and powerful programs to control various industrial systems. Whether you are
a seasoned PLC programmer or just getting started, understanding variables
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is essential for success. If you enjoyed
this video please hit the like button below
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leave a comment below and I'll do my best to answer it
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or robust data logging please click on the link in the description below to get it
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Thanks so much for watching, I'll
see you next time. Stay safe
