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new program add in a logical view it have following file
B&R Automation Studio Structured Text Programing Language
In B&R Automation Studio Structured Text Is A High Level Text-Based Programming Language based on the IEC 61131-3 standard. That Uses Series Of Statements To Define Complex And Sophisticated Control Algorithms For Industrial Systems. each statement of Structured Text are separated by semicolons(;). One statement can span several lines, and an end-of-line is handled as a space character. Structured Text (ST) Language Used In Programmable Logic Controllers (PLC's) To Write Logic For Industrial Automation Applications. Structured Text Have Set Of Expression, Assignment, Loops, Conditional Statements, And Functions For Making A Program. By Using A Structured Text Language Possible To Make Reusable Code Blocks And Use In Different Program.
Add Structured Text program in B&R automation Project
open your B&R automation studio and Create A New Project if you don’t have physical plc than is a pc based simulation for making a program during a project setup select pc based simulation. to making a program in Structured Text for a plc in a B&R automation studio, In A Menu Bar Select Insert Than Add Object Or Right Click on logical view Than Add Object.
a add object dialog select program than select new program or existing program click next
enter name of program and local data type name and add a description of your program click next
enter the initialization part of the program, select Language as Structured Text in program from drop down menu click to next
select an option if you want to assign object to cpu than click finish
new program add in a logical view it have following file
- Cyclic code : A cyclic object is executed in a cycle time.
- initialization code : program that execute during start up
- local data type : declarations of Custom data types.
- local variable: declarations of local Variable for a program
declarations of variable for Structured Text program
variable are two types local variable and global variable. for declaration of global variable open Global.var file than add variable for local variable declarations in your new program open .var file as shown below image and add required variable select data type or instance name.
B&R automation Structured Text program layout
open your inserted Structured Text program, in B&R automation Structured Text program have predefined layout which start with a file header section after file header section main program section is start from PROGRAM _CYCLIC to END_PROGRAM
file header section Structured Text program
file header section contain information of source code file like copyright, module name, file name, author of program, date of file creation, description of source code file and file history. all part of this section only for information, file header section not executed during program execution because it is commented statement. you also add or modify any details like revision, your company name, author name, date, company website or developer email etc.
main program section of Structured Text program
main program start from PROGRAM _CYCLIC to END_PROGRAM. in this section we write statements and each statement separated by semicolons.
Structure text B&R automation examples
below is the simple example of two momentary push button two start and stop motor one momentary push button declare as Pb_start and another push button declare as pb_stop to stop motor. if the pb_start is pressed than motor start if the pb_stop pressed than motor stop. so in this example have if else statement. if else is a conditional statement in a programming. for joining multiple condition in if else statement we use logical operator in this example we use AND, OR and Not Logical operator. try make some another program if any difficulty comment below.
B&R automation studio timer program in Structured Text
