Variables
All variables within the entire system project are grouped as follows:
Variable | Description |
Global variables | List all global variables that are used and accessible throughout the entire program |
Retain Variables | List all variables that are to be retained when the system is powered down |
Program variables | List the variables related to your specific selected program |
For each variable, the Dictionary toolbox allows you to set the following parameters:
Field | Description |
Name | The variable name |
Value |
All the variables in the Dictionary are animated with real-time values 1 Note that this column is only displayed when your application is running For more details, see "Variable Monitoring" |
Type | The variable type (which can also be UDFB"User Defined Function Block" UDFB can be used as a sub-function block in another program of the application. It is described using FBD, LD, ST or IL language. Input / output parameters of a UDFB (as well as private variables) are declared in the variable editor as local variables of the UDFB or complex structure) |
Dim. | To declare an array, you can specify dimension(s) for an internal variable |
Attrib. |
The variable attributes (Read Only, External, IN, OUT) as defined:
|
Init value | The variable initial value when you start your application (see more details here) |
User Group | The variable user group (used for sorting variables) |
HMI"Human-machine interfaces " Also known as computer-human interfaces (CHI), and formerly known as man-machine interfaces, they are usually employed to communicate with PLCs and other computers, such as entering and monitoring temperatures or pressures for further automated control or emergency response | Select variables to be used in HMI (see Map Variables to HMI) |
Tag |
The variable tag is a short comment, that can be displayed together with the variable name in graphical editors. See example here
Edit the variable parameters
Add the variable to your FBD"Function block diagram" A function block diagram describes a function between input variables and output variables. A function is described as a set of elementary blocks program
Resize the rectangle to make the Tag and Description visible
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Description | The variable description is a long comment text that describes the variable |
Syb. | reserved |