147 
Literals & Keywords 
Literals 
REAL#1.0 
INT#3 
TIME#2s 
Keywords 
List in “edit wizard” 
Keywords only apply to ST POUs 
Notice ALL CAPS to define a 
literal value 
Notice the decimal point – never an “implied” 
decimal point 
Variables 
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How to convert PDF to JPEG using C#.NET PDF to JPEG conversion / converter library control SDK
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Change file from pdf to jpg - VB.NET PDF Convert to Jpeg SDK: Convert PDF to JPEG images in vb.net, ASP.NET MVC, WinForms, WPF project
Online Tutorial for PDF to JPEG (JPG) Conversion in VB.NET Image Application
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148 
“ _ “ Underscore Character 
Variables 
With Alphanumeric Characters in Variable Name 
Servo_01 
_01Servo 
Place Holder Within Data (Cosmetic Only) 
Initial Values 
» 100_000_000.0 
Literals 
» LREAL#100_000_000.0 
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Online PDF to JPEG Converter. Download Free Trial. Convert a PDF File to JPG. Drag and drop your PDF in the box above and we'll convert the files for you.
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149 
View Variables 
View Local Variables 
View Global Variables 
Variables 
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C# Image Convert: How to Convert Tiff Image to Jpeg, Png, Bmp, &
RasterEdge.XDoc.PDF.dll. How to change Tiff image to Bmp image in your C# program. This demo code convert TIFF file all pages to bmp images.
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150 
Variables: POU 2 
POU 2 
Variable Usage 
POU 1 
MC_Power_2
Axis02.AxisNum
Enable02
Status02
Axis02.AxisNum
MC_Power
Axis 
Axis 
Enable
Enable_Positive
Enable_Negative
BufferMode
Status 
Busy 
Active 
Error 
ErrorID 
MC_Power_2
Axis02.AxisNum
Enable02
Status02
Axis02.AxisNum
MC_Power
Axis 
Axis 
Enable
Enable_Positive
Enable_Negative
BufferMode
Status 
Busy 
Active 
Error 
ErrorID 
MC_Power_2
Axis02.AxisNum
Enable02
Status02
Axis02.AxisNum
MC_Power
Axis 
Axis 
Enable
Enable_Positive
Enable_Negative
BufferMode
Status 
Busy 
Active 
Error 
ErrorID 
MC_Power_2
Axis02.AxisNum
Enable02
Status02
Axis02.AxisNum
MC_Power
Axis 
Axis 
Enable
Enable_Positive
Enable_Negative
BufferMode
Status 
Busy 
Active 
Error 
ErrorID 
Input01
Start
001
StartAgain
Input03
Reset
/
Reset
Enable01
Enable02
Input02
StopAll
MC_Power_2
Axis02.AxisNum
Enable02
Status02
Axis02.AxisNum
MC_Power
Axis 
Axis 
Enable
Enable_Positive
Enable_Negative
BufferMode
Status 
Busy 
Active 
Error 
ErrorID 
MC_Power_2
Axis02.AxisNum
Enable02
Status02
Axis02.AxisNum
MC_Power
Axis 
Axis 
Enable
Enable_Positive
Enable_Negative
BufferMode
Status 
Busy 
Active 
Error 
ErrorID 
POU xxx 
Variables: POU 1 
Name
Usage
V001
VAR
V002
VAR
G_AccDec VAR_EXTERNAL
G_V004
VAR_EXTERNAL
Name
Usage
V001
VAR
V002
VAR
G_AccDec VAR_EXTERNAL
G_V005
VAR_EXTERNAL
Variables: POU xxx 
GLOBAL_VARIABLES 
Name
Usage
G_AccDec VAR_GLOBAL
G_V004
VAR_GLOBAL
G_V005
VAR_GLOBAL
Variables 
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151 
Variables: Practice_ST 
Practice_ST 
Practice_LD 
Variables: Practice_LD 
GLOBAL_VARIABLES 
Create global and local variables 
Global Variables 
Best Practice:  
Name global variables 
with prefix G_ 
Variables 
C# TIFF: How to Use C#.NET Code to Compress TIFF Image File
C:\demo3.jpg" }; // Construct List<REImage> object. List<Bitmap> images = new List<Bitmap>(); / Step1: Load image to REImage object. foreach (string file in
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152 
Use “Show Borders” for color confirmation of global and local 
Extras, Options, Graphical Editor (2) 
Global & Local Color Format 
Variables 
153 
GLOBAL or LOCAL? 
Use LOCAL unless global is 
required 
Suggested Convention 
» Type G_ in front of all global 
variables 
– G_EnableRight 
– G_EnableLeft 
» Visual Confirmation when looking 
at global list 
Variable Conventions 
Variables 
154 
Insert Variable Groups 
Rename 
User Variables 
PC Simulator 
Variable Groups 
Editing Variables 
Variable Groups facilitate 
organization of the global 
variables 
155 
Variable List Organization 
Global variables in the wrong group? 
Example: Check LIO-01 Group 
Drag variables to appropriate group 
Editing Variables 
Red Line 
appears while 
dragging 
Click and drag row 
header to highlight 
multiple rows 
Click and drag row 
header again to 
move the group of 
variables 
156 
Variable Groups 
Global Variable Groups are 
for organizational purposes 
only and do not affect 
operation 
Editing Variables 
Create the variable “G_DelayTime” in the Init POU 
More information 
coming on time 
format T#2s 
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